ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • ENERGY PRODUCTION AND CONVERSION  (385)
  • 1990-1994
  • 1980-1984  (385)
  • 1935-1939
  • 1984  (385)
Collection
Keywords
Years
  • 1990-1994
  • 1980-1984  (385)
  • 1935-1939
Year
  • 101
    facet.materialart.
    Unknown
    Non-doe-sponsored Domestic Dish Activities (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The parabolic dish development activities being undertaken within the private sector of the United States were addressed. The primary emphasis of these non-DOE-sponsored activities is the development of commercial products that can penetrate the market in the near term. The exchange of information between these activities and the complementary DOE-sponsored work directed toward developing advancements in technology is considered to be of major importance. The experiences and problems encountered in the private sector serve as inputs that will help guide in the planning of the DOE program. In turn, a principal objective of the DOE program is the transfer findings of its technological development activities to the private sector. Activities in the private are characterized by their diversity in terms of both product design and marketing approach. The differences in the design concepts and the sizes of the dish concentrators under development are particularly noteworthy.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 67
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 102
    facet.materialart.
    Unknown
    Advanced Solar Receivers (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Low thermal efficiencies in solar receivers are discussed in terms of system design. It is recommended that careful attention be given to the overall thermal systems design, especially to conductive losses about the window and areas of relatively thin insulation. If the cavity design is carefully managed to insure a small, minimally reradiating aperture, the goal of a very high efficiency cavity receiver is a realistic one.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 50-56
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 103
    facet.materialart.
    Unknown
    Current Status of an Organic Rankine Cycle Engine Development Program (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The steps taken to achieve improved bearing life in the organic Rankine cycle (ORC) engine being developed for use on solar parabolic dishes are presented. A summary of test results is given. Dynamic tests on the machine shaft and rotors of the ORC engine are also discussed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 48
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 104
    facet.materialart.
    Unknown
    Parabolic Dish Concentrator (PDC-2) Development (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The design of the Parabolic Dish Concentrator (PDC-2) is described. The following five subsystems of the concentrator are discussed: (1) reflective surface subsystem, (2) support structure subsystem, (3) foundation, (4) drive subsystem, and (5) electrical and control subsystem. The status of the PDC-2 development project is assessed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 16-24
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 105
    facet.materialart.
    Unknown
    Barrier height determination on Schottky contacts formed at the back contact-semiconductor interface of degraded solar cells (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A method is described of determining an equivalent circuit for solar cells which have degraded as a result of the formation of a rectifying Schottky barrier at the back contact. An excellent fit of experimental data has been achieved using SCEPTRE with an equivalent circuit derived from the shape of the measured current voltage characteristics. One key parameter of the Schottky barrier diode, the reverse saturation current, can be used to determine the barrier potential. The barrier potential increases as the cell is stressed with 0.5 volts being a typical experimentally determined value for a degraded cell.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 106
    facet.materialart.
    Unknown
    Uncertainties about the physical electronics of n(+) and p(+) silicon, with applications for solar cells (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: After brief surveys of the significance of n(+) and p(+) silicon for the conversion efficiency of solar cells, the work in this paper is concentrated on uncertainties in the characterization of n(+) and p(+) regions. The topics treated include the quantum density states of the majority carrier band and the position of the Fermi level relative to the edge of this band, the resulting force field on the minority carriers accompanying a space dependence of the energy gap narrowing, and the interpretation of measurements of the energy gap narrowing and the minority carrier diffusivity and mobility. The treatment seeks to show how these uncertainties relate to solar cell design and to estimates of attainable conversion efficiency.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Solar Cells (ISSN 0379-6787); 12; 131-140
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 107
    facet.materialart.
    Unknown
    Photovoltaics - Where are we going? (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The directions that will be followed for solar cell development, production and marketing are projected on the basis of experiences gained during the JPL's Flat-Plate Solar Array project. It is thought that a billion dollar market for Si ribbons can be established by 1990. Thin film technology will yield a product at $2 U.S./W at the end of the 1980s. R&D is growing more focused on central station photovoltaic generators, although the residential market may be the more suitable goal. The intermediate markets, e.g., schools, hospitals and shopping centers may be developed before the central stations.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Solar Cells (ISSN 0379-6787); 12; 37-40
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 108
    facet.materialart.
    Unknown
    Past developments and the future of nickel electrode cell technology (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The nickel hydroxide electrode has evolved over nearly 100 years from the pocket electrode structure through to the present design of a light weight, porous, plaque structure. Before discussing the historical aspects, it would be helpful to point out that there are basically two parts to the electrode: the active material and the current (electron) collector. Together they provide the essential properties for storing and converting the chemical energy into electrical energy and vice versa. The electrical energy is stored in the nickel hydroxide active material during charge, in which the electrode is oxidized. The chemical energy is converted back to electrical energy during discharge. The active material is itself initially non-conductive. Therefore it must be housed in a high conductivity metallic structure which serves as the current collector. This is, in turn, connected to another high conductivity metallic structure called the terminal.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Journal of Power Sources (ISSN 0378-7753); 12; 177-192
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 109
    facet.materialart.
    Unknown
    Electron-beam induced current characterization of back-surface field solar cells using a chopped scanning electron microscope beam (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A chopped electron beam induced current (EBIC) technique for the chacterization of back-surface field (BSF) solar cells is presented. It is shown that the effective recombination velocity of the low-high junction forming the back-surface field of BSF cells, in addition to the diffusion length and the surface recombination velocity of the surface perpendicular to both the p-n and low-high junctions, can be determined from the data provided by a single EBIC scan. The method for doing so is described and illustrated. Certain experimental considerations taken to enhance the quality of the EBIC data are also discussed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Journal of Applied Physics (ISSN 0021-8979); 55; 555-559
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 110
    facet.materialart.
    Unknown
    Proton damage in GaAs solar cells (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A simplified model for the short-circuit current reduction caused by proton-induced radiation damage is described. The model accounts for the nonuniformity of defect production within heteroface GaAs shallow junction solar cells. The results from the model show agreement with the strong energy dependence observed in proton radiation damage experiments.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: IEEE Transactions on Electron Devices (ISSN 0018-9383); ED-31; 421
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 111
    facet.materialart.
    Unknown
    Applicability of the Meyer-Neldel rule to solar cells (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A comparison of data taken on high quality silicon, GaAs, and GaInAs solar cells with those taken on a variety of homojunction, heterojunction, and metal-insulator-semiconductor devices indicates that while the Meyer-Neldel rule may be applicable to certain types of solar cells it is not applicable to well-behaved, diffusion-controlled homojunction devices. It cannot be used, therefore, as a universal rule to predict maximum achievable solar cell voltages.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Applied Physics Letters (ISSN 0003-6951); 45; 1298-130
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 112
    facet.materialart.
    Unknown
    Characteristics of arc currents on a negatively biased solar cell array in a plasma (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The time dependence of the emitted currents during arcing on solar cell arrays is being studied. The arcs are characterized using three parameters: the voltage change of the array during the arc (i.e., the charge lost), the peak current during the arc, and the time constant describing the arc current. This paper reports the dependence of these characteristics on two array parameters, the interconnect bias voltage and the array capacitance to ground. It was found that the voltage change of the array during an arc is nearly equal to the bias voltage. The array capacitance, on the other hand, influences both the peak current and the decay time constant of the arc. Both of these characteristics increase with increasing capacitance.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-31; 1584-158
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 113
    facet.materialart.
    Unknown
    Method for calculating multidimensional electric fields in photovoltaic modules (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A finite element method for evaluating the electrical isolation characteristics of photovoltaic modules was developed; its accuracy was verified by comparison with an exact solution for a geometry similar to that of solar cells. Tests on a square test coupon, employed in electrical isolation tests, and a group of disc-shaped solar cells illustrated the finite element method's usefulness in evaluating module encapsulation designs. Finite element models had to avoid adjacent large and small elements and elements with large aspect ratios, and the NASTRAN output had to be curve fitted to calculate the maximum field. Geometric limits were indicated: cells with very sharp edges, and cells much thinner or thicker than the dielectric pottant layer.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Solar Cells (ISSN 0379-6787); 11; 309-330
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 114
    facet.materialart.
    Unknown
    Review of the DOE/NASA wind turbine engineering information system (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A statistical analysis of data obtained from the Technology and Engineering Information Systems was made. The systems analyzed consist of the following elements: (1) sensors which measure critical parameters (e.g., wind speed and direction, output power, blade loads and component vibrations); (2) remote multiplexing units (RMUs) on each wind turbine which frequency-modulate, multiplex and transmit sensor outputs; (3) on-site instrumentation to record, process and display the sensor output; and (4) statistical analysis of data. Two examples of the capabilities of these systems are presented. The first illustrates the standardized format for application of statistical analysis to each directly measured parameter. The second shows the use of a model to estimate the variability of the rotor thrust loading, which is a derived parameter. Previously announced in STAR as N82-23696
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Solar Energy (ISSN 0038-092X); 32; 5, 19; 591-596
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 115
    facet.materialart.
    Unknown
    A mathematical model for the iron/chromium redox battery (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A mathematical model has been developed to describe the isothermal operation of a single anode-separator-cathode unit cell in a redox-flow battery and has been applied to the NASA iron/chromium system. The model, based on porous electrode theory, incorporates redox kinetics, mass transfer, and ohmic effects as well as the parasitic hydrogen reaction which occurs in the chromium electrode. A numerical parameter study was carried out to predict cell performance to aid in the rational design, scale-up, and operation of the flow battery. The calculations demonstrate: (1) an optimum electrode thickness and electrolyte flow rate exist; (2) the amount of hydrogen evolved and, hence, cycle faradaic efficiency, can be affected by cell geometry, flow rate, and charging procedure; (3) countercurrent flow results in enhanced cell performance over cocurrent flow; and (4) elevated temperature operation enhances cell performance.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Electrochemical Society, Journal (ISSN 0013-4651); 131; 701-709
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 116
    facet.materialart.
    Unknown
    High-purity silicon crystal growth (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Crystal growth parameter effects on minority carrier lifetime and solar cell efficiencies were investigated using high purity techniques such as float zoning. Study objectives include the following: (1) optimize dopants and minority carrier lifetime in FZ material for high efficiency silicon solar cell applications; (2) improve the understanding of lifetime degradation mechanisms (point defects, impurities, thermal history, surface effects, etc.), and (3) crystallographic defect characterization of float zone and ribbon crystals via X-ray topography.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 587-605
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 117
    facet.materialart.
    Unknown
    Stress and efficiency studies in EFG (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Stress and efficiency studies in EFG were carried out for silicon sheet growth. Methods were developed to quantify influence of dislocation electrical activity on bulk lifetime. A new creep law formulation for silicon stress was developed. Bulk lifetime degradation due to increase in doping levels was also examined.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 545-560
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 118
    facet.materialart.
    Unknown
    Analysis of stress-strain relationships in silicon ribbon (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: An analysis of stress-strain relationships in silicon ribbon is presented. A model to present entire process, dynamical Transit Analysis is developed. It is found that knowledge of past-strain history is significant in modeling activities.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 517-524
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 119
    facet.materialart.
    Unknown
    Excimer laser annealing for fabrication of low-cost solar cells (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The goal was to determine if a pulsed excimer laser annealing (PELA) is cost effective compared to a baseline process. An excimer laser pulsed annealing apparatus was built. Three hundred solar cells were fabricated. An economic analysis was performed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 447-459
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 120
    facet.materialart.
    Unknown
    Microwave-enhanced thin-film deposition (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The deposition of semiconducting and insulating thin films at low temperatures using microwave technology was explored. The method of plasma formations, selection of a power source, the design of the microwave plasma cavity, the microwave circuitry, impedance matching, plasma diagnostics, the deposition chamber and the vacuum system were studied.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 433-435
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 121
    facet.materialart.
    Unknown
    MOD silver metallization for photovoltaics (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The development of flat plate solar arrays is reported. Photovoltaic cells require back side metallization and a collector grid system on the front surface. Metallo-organic decomposition (MOD) silver films can eliminate most of the present problems with silver conductors. The objectives are to: (1) identify and characterize suitable MO compounds; (2) develop generic synthesis procedures for the MO compounds; (3) develop generic fabrication procedures to screen printable MOD silver inks; (4) optimize processing conditions to produce grid patterns and photovoltaic cells; and (5) develop a model which describes the adhesion between the fired silver film and the silicon surface.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 389-403
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 122
    facet.materialart.
    Unknown
    Development of high-efficiency solar cells on silicon web (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The development of high efficiency solar cells on a silicon web is discussed. Heat treatment effects on web quality; the influence of twin plane lamellae, trace impurities and stress on minority carrier lifetime; and the fabrication of cells are discussed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 353-363
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 123
    facet.materialart.
    Unknown
    Sensitivity analysis of high-efficiency silicon solar-cell design parameters (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Silicon solar cell design parameters were investigated to determine their bearing on cell efficiency. Among the parameters reviewed were: (1) bulk resistivity, (2) minority carrier lifetime cell thickness, (3) front junction depth, (4) front surface doping concentration, (5) front surface recombination velocity, and (6) back surface contact. The following were concluded: (1) there is good agreement between experimental and simulation results; (2) sheet material quality improvement is needed for high efficiency cells; (3) 20% cell of this design is feasible with 10 ms bulk lifetime material; and (4) for achieving efficiencies higher than 20% new cell designs including thin cells with light trapping and back surface field should be considered.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 24th Project Integration Meeting; p 325-331
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 124
    facet.materialart.
    Unknown
    Interfacial bonding stability (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Interfacial bonding stability by in situ ellipsometry was investigated. It is found that: (1) gamma MPS is an effective primer for bonding ethylene vinyl acetate (EVA) to aluminum; (2) ellipsometry is an effective in situ technique for monitoring the stability of polymer/metal interfaces; (3) the aluminized back surface of silicon wafers contain significant amounts of silicon and may have glass like properties.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 183-189
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 125
    facet.materialart.
    Unknown
    Physics of heavily doped silicon and solar-cell parameter measurement (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A study of the physics of heavily doped silicon and solar cell parameter measurement was undertaken. The parameters investigated were energy gap, lifetime, recombination velocity, diffusivity, mobility and if N or P is high.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 283-293
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 126
    facet.materialart.
    Unknown
    Silicon production in an aerosol reactor (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: An aerosol reactor for the growth of large silicon particles by silane pyrolysis was shown to demonstrate the following properties: (1) generate seed particles by pyrolysis of a small amount of silane; (2) mix seed aerosol with primary silane flow, limiting number concentration such that the amount of silane is sufficient to grow the desired size of particles from the seed; and (3) react the silane at a rate which is controlled such that the seed particles scavenge the condensible vapors rapidly enough to inhibit further nucleation.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 275-280
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 127
    facet.materialart.
    Unknown
    Silicon refinement by chemical vapor transport (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Silicon refinement by chemical vapor transport is discussed. The operating characteristics of the purification process, including factors affecting the rate, purification efficiency and photovoltaic quality of the refined silicon were studied. The casting of large alloy plates was accomplished. A larger research scale reactor is characterized, and it is shown that a refined silicon product yields solar cells with near state of the art conversion efficiencies.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 241-246
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 128
    facet.materialart.
    Unknown
    Studies of oxygen- and carbon-related defects in high-efficiency silicon solar cells (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Studies were conducted to investigate the vague nature of carbon and oxygen related defects in high efficiency silicon solar cells. High temperature tests were employed to perform these investigations.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 305-311
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 129
    facet.materialart.
    Unknown
    Rapid Test Bed Concentrator (TBC) Alignment Techniques (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A new, labor and cost saving method was developed to eliminate the procedure of covering all (220) mirrors and uncovering then one-by-one in sequence to adjust each to the focal plane. This latest method being used to align mirrors of a parabolic solar concentrator utilizes a computer-derived target of discreet images made up of individual mirror reflections on a plane in front of the intended, nominal, focal point. Incorporating this computer technique increases accuracy and gives potential to develop flux distributions required by different receiver designs.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 226
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 130
    facet.materialart.
    Unknown
    Recent Solar Measurements Results at the Parabolic Dish Test Site (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: After the Mexican volcanic eruptions of March 28, April 3 and 4, 1982, the question of its effect on insolation levels at the Parabolic Dish Test Site (PDTS) naturally arose. Clearly, the answer to the original question is that the Mexican volcanic explosion had a significant impact on energy and insolation levels at the PDTS and, furthermore, it has been quite long lasting. The first really significant decrease in energy and insolation levels occurred in June 1982 when the energy level decreased by 19.7% while the peak insolation levels went down by 4.0%. June of 1982 was also the first month (of 13 consecutive months) when peak insolation levels did not equal or exceed 1,000 W/sq m. Signs of a recovery from the effects of the volcanic explosion began to appear in May of 1983, when the energy level exceeded that of May 1981 as well as May 1982. It would appear that energy and insolation levels are improving at the PDTS, but have not quite reached normal or pre-volcanic levels. At this time the data would seem to suggest a return to normal energy and insolation levels will occur in the very near future.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 236-243
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 131
    facet.materialart.
    Unknown
    Operational Experience from Solar Thermal Energy Projects (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Over the past few years, Sandia National Laboratories were involved in the design, construction, and operation of a number of DOE-sponsored solar thermal energy systems. Among the systems currently in operation are several industrial process heat projects and the Modular Industrial Solar Retrofit qualification test systems, all of which use parabolic troughs, and the Shenandoah Total Energy Project, which uses parabolic dishes. Operational experience has provided insight to both desirable and undesirable features of the designs of these systems. Features of these systems which are also relevant to the design of parabolic concentrator thermal electric systems are discussed. Other design features discussed are system control functions which were found to be especially convenient or effective, such as local concentrator controls, rainwash controls, and system response to changing isolation. Drive systems are also discussed with particular emphasis of the need for reliability and the usefulness of a manual drive capability.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 159-168
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 132
    facet.materialart.
    Unknown
    LEC System Development (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The Lajet Energy Company (LEC) 460 is described. A parabolic dish which incorporates a microprocessor to automatically point it toward the Sun from sunrise to sunset is used. The dish is composed of a set of mirrors (made of reflective polymeric film) which focus and concentrate the Sun's energy on a receiver, producing intense but controlled amounts of heat. The LEC 460 employs a design concept that permits the use of common and low cost materials. All major structural components are fabricated from low carbon, low alloy steel using methods adaptable to mass production. The mirrors are supported on a steel tubing frame. This frame is attached near its center of gravity to a cantilevered support structure. The mirrors and frame are counterbalanced by the weight of the receiver, thus reducing the energy needed to move the collector (parasitic load) and allowing movement on two axes. Each LEC 460 solar concentrator contains a reflective array consisting of twenty four 60 inch diameter mirrors.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 127-128
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 133
    facet.materialart.
    Unknown
    Reference-cell calibration activities (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The use of secondary calibration in large area pulsed solar simulators (LAPSS) is discussed. It is argued that primary calibration in sunlight is time consuming, that only a limited sun calibration of a set of primary reference cells is required, that the LAPSS light source is filtered to closely match the am 1.5 direct spectrum, and that the temperal stability of the filtered LAPSS is excellent. There is the possibility of a lower error rate. Lower costs are anticipated.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 663-668
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 134
    facet.materialart.
    Unknown
    Thin-film reliability and engineering overview (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The reliability and engineering technology base required for thin film solar energy conversions modules is discussed. The emphasis is on the integration of amorphous silicon cells into power modules. The effort is being coordinated with SERI's thin film cell research activities as part of DOE's Amorphous Silicon Program. Program concentration is on temperature humidity reliability research, glass breaking strength research, point defect system analysis, hot spot heating assessment, and electrical measurements technology.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 24th Project Integration Meeting; p 643-646
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 135
    facet.materialart.
    Unknown
    Accelerated stress factors and failure/degradation mechanisms in terrestrial solar cells (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Plans for the development of amorphous cell accelerated test measurement instrumentation are outlined. Diagrams for an 11-lamp ELH solar simulator and ac light source instrumentation are given. Examples of ac and dc analysis graphs are also provided.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 647-656
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 136
    facet.materialart.
    Unknown
    Photovoltaic module spread-of-flame testing (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Photovoltaic modules used in solar energy conversion are tested for flammability. Class B burning brand tests were conducted with the following results: module glass shattered and hydrocarbon encapsulants ignited. Penetration of back surface material was the prime cause of failure. Materials with greater flame and heat resistance are under consideration to increase back surface integrity up to Class A burning brand standard. The most promising is stainless steel foil.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 24th Project Integration Meeting; p 633-638
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 137
    facet.materialart.
    Unknown
    Laser-assisted solar-cell metallization processing (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A photolytic metal deposition system using a focused continuous wave ultraviolet laser, a photolytic metal deposition system using a mask and ultraviolet flood illumination, and a pyrolytic metal deposition system using a focused continuous wave laser were studied. Fabrication of solar cells, as well as characterization to determine the effects of transient heat on solar cell junctions were investigated.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 405-420
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 138
    facet.materialart.
    Unknown
    Important loss mechanisms in high-efficiency solar cells (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A study was conducted to identify loss mechanisms in high efficiency silicon solar cells. The following were considered: (1) recombination loss mechanisms; (2) high efficiency cells; (3) very high efficiency cells; and (4) ultra high efficiency cells.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 347-351
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 139
    facet.materialart.
    Unknown
    Amorphous metallic films in silicon metallization systems (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The general objective was to determine the potential of amorphous metallic thin films as a means of improving the stability of metallic contacts to a silicon substrate. The specific objective pursued was to determine the role of nitrogen in the formation and the resulting properties of amorphous thin-film diffusion barriers. Amorphous metallic films are attractive as diffusion barriers because of the low atomic diffusivity in these materials. Previous investigations revealed that in meeting this condition alone, good diffusion barriers are not necessarily obtained, because amorphous films can react with an adjacent medium (e.g., Si, Al) before they recrystallize. In the case of a silicon single-crystalline substrate, correlation exists between the temperature at which an amorphous metallic binary thin film reacts and the temperatures at which the films made of the same two metallic elements react individually. Amorphous binary films made of Zr and W were investigated. Both react with Si individually only at elevated temperatures. It was confirmed that such films react with Si only above 700 C when annealed in vacuum for 30 min. Amorphous W-N films were also investigated. They are more stable as barriers between Al and Si than polycrystalline W. Nitrogen effectively prevents the W-Al reaction that sets in at 500 C with polycrystalline W.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 379-387
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 140
    facet.materialart.
    Unknown
    Measuring bulk recombination rates and boundary recombination velocities (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A study was undertaken to measure bulk recombination rates and boundary recombination velocities in silicon solar cell materials.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 295-304
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 141
    facet.materialart.
    Unknown
    Topics in electrochemical degradation of photovoltaic modules (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Electrochemical degradation of photovoltaic modules was examined. It is found that the extent of electrochemical damage is dependent on the integrated leakage current. The PV electrochemical degradation mechanisms in the two polarities are different: (1) degradation rates in the two polarities are of the same order of magnitude; (2) center tapped grounded arrays are a preferred system configuration to minimize electrochemical degradation. The use of thicker pottant layers and polymer substrate films to reduce equilibrium leakage current values is suggested. A metallized substrate layer, if used, should be isolated from the pottant and the frame by polyester layers, and EVA modules appear to be consistent with 30 year life allocation levels for electrochemical damage. Temperature acceleration factors are well behaved and moderately well understood; humidity acceleration factors vary radically with module construction and materials and require additional research.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 24th Project Integration Meeting; p 191-205
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 142
    facet.materialart.
    Unknown
    JPL in-house fluidized-bed reactor research (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Fluidized bed reactor research techniques for fabrication of quartz linears was reviewed. Silane pyrolysis was employed in this fabrication study. Metallic contaminant levels in the silicon particles were below levels detectable by emission spectroscopy.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 24th Project Integration Meeting; p 251-257
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 143
    facet.materialart.
    Unknown
    Polymer-water interaction studies (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Polymer water interactions were investigated. The following interactions were studied: (1) water absorption and desorption kinetics in EVA and PVB; (2) humidity dependence of electrical properties of EVA and PVB; (3) plasticizer effects in PVB; and (4) radiation effects in PVB and EVA.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 24th Project Integration Meeting; p 207-237
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 144
    facet.materialart.
    Unknown
    EVA-glass interface bond stability (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The ethylene vinyl acetate/glass interface bond stability was investigated. Special methods to determine the structure of polymer/glass interface were developed. Structural changes related to hydrothermal degradation of polymer/glass interface are examined. Methods to inhibit the degradation reaction which occur at polymer/glass interface are developed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 24th Project Integration Meeting; p 165-181
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 145
    facet.materialart.
    Unknown
    Reliability physics (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Speakers whose topics relate to the reliability physics of solar arrays are listed and their topics briefly reviewed. Nine reports are reviewed ranging in subjects from studies of photothermal degradation in encapsulants and polymerizable ultraviolet stabilizers to interface bonding stability to electrochemical degradation of photovoltaic modules.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 24th Project Integration Meeting; p 107-109
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 146
    facet.materialart.
    Unknown
    Photothermal degradation studies of encapsulants (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The reliability physics program at JPL is outlined. The overall objectives and approaches are given in the program. The objectives, approaches and conclusions are given for two specific parts of the programs. These two parts are mechanistic studies of photothermal degradation and performance characteristics of materials with respect to photothermal stresses.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 24th Project Integration Meeting; p 111-119
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 147
    facet.materialart.
    Unknown
    Block V module program (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: An outlined overview of this module program is given. Tables are given for the following characteristics: module power trend, packing factor trend, cell and circuit characteristics, module physical characteristics, electrical performance, cell efficiency trend, module efficiency trend and module cost trend. The principal improvements are larger modules and higher performance.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 24th Project Integration Meeting; p 99-105
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 148
    facet.materialart.
    Unknown
    High-efficiency module and array research (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: An outline is presented giving module high efficiency research activities and module technologies contributing to high efficiency. Some factors given on high efficiency are high cell packing factors, low optical losses, low electrical mismatch losses and low operating temperatures. Factors given which are associated with reliability of modules are high efficiency cells, narrow module borders, antisoiling coatings, and antireflection coatings on glass-air interfaces.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 24th Project Integration Meeting; p 75-76
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 149
    facet.materialart.
    Unknown
    Flat-plate module efficiency versus cost tradeoffs (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The Five Year Research Plan energy cost methodology and in depth analyses based on the extensive data that are relevant to PV systems are used to facilitate the accomplishment of the $0.15/kWh energy cost goal. An equation is given for the five year energy cost methodology. The allocation guidelines are designed to be consistent with flat solar array (FSA) milestones for module cost, module efficiency, and the programmatic goal for energy cost. They are research targets that appear to be achievable, given prior accomplishments and planned activities in the areas of low cost silicon purification, low cost sheet material, high efficiency cell processing, low cost, long life encapsulants, and automated fabrication method. Extensive sensitivity analysis work has been performed that shows that these guidelines represent an efficient way to meet the intent of the DOE program.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 24th Project Integration Meeting; p 77-82
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 150
    facet.materialart.
    Unknown
    Stirling Module Development Overview (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The solar parabolic dish Stirling engine electrically generating module consists of a solar collector coupled to a Stirling engine powered electrical generator. The module is designed to convert solar power to electrical power in parallel with numerous identical units coupled to an electrical utility power grid. The power conversion assembly generates up to 25 kilowatts at 480 volts potential/3 phase/alternating current. Piston rings and seals with gas leakage have not occurred, however, operator failures resulted in two burnt out receivers, while material fatigue resulted in a broken piston rod between the piston rod seal and cap seal.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 88-93
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 151
    facet.materialart.
    Unknown
    SPIKE-2: a Practical Stirling Engine for Kilowatt Level Solar Power (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Recent advances in the art of free piston Stirling engine design make possible the production of 1-10kW free piston Stirling linear alternator engine, hermetically sealed, efficient, durable and simple in construction and operation. Power output is in the form of single or three phase 60 Hz. AC, or DC. The three phase capability is available from single machines without need of external conditioning. Engine voltage control regains set voltage within 5 cycles in response to any load change. The existing SPIKE-2 design has an engine alternator efficiency of 25% at 650 C heater wall temperature and a service life of over three years in solar service. The same system can be scaled over a range of at least 100 watts to 25kW.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 84-87
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 152
    facet.materialart.
    Unknown
    Recent Developments: PKI Square Dish for the Soleras Project (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The Square Dish solar collectors are subjected to rigorous design attention regarding corrosion at the site, and certification of the collector structure. The microprocessor controls and tracking mechanisms are improved in the areas of fail safe operations, durability, and low parasitic power requirements. Prototype testing demonstrates performance efficiency of approximately 72% at 730 F outlet temperature. Studies are conducted that include developing formal engineering design studies, developing formal engineering design drawing and fabrication details, establishing subcontracts for fabrication of major components, and developing a rigorous quality control system. The improved design is more cost effective to product and the extensive manuals developed for assembly and operation/maintenance result in faster field assembly and ease of operation.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 82
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 153
    facet.materialart.
    Unknown
    Solar Tests of Aperture Plate Materials for Solar Thermal Dish Collectors (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: If a malfunction occurs in a solar thermal point-focus distributed receiver power plant while a concentrator is pointed at the Sun, motion of the concentrator may stop. As the Sun moves relative to the Earth, the spot of concentrated sunlight then slowly walks off the receiver aperture, across the receiver face plate, and perhaps across adjacent portions of the concentrator. Intense local heating by the concentrated sunlight may damage or destroy these parts. The behavior of various materials under conditions simulating walk-off of a parabolic dish solar collector were evaluated. Each test consisted of exposure to concentrated sunlight at a peak flux density of about 7000 kW/square meter for 15 minutes. Types of materials tested included graphite, silicon carbide, silica, various silicates, alumina, zirconia, aluminum, copper, steel, and polytetrafluoroethylene. The only material that neither cracked nor melted was grade G-90 graphite. Grade CS graphite, a lower cost commercial grade, cracked half-way across, but did not fall apart. Both of these grades are medium-grain extruded graphites. A graphite cloth (graphitized polyacrylonitrile) showed fair performance when tested as a single thin ply; it might be useful as a multi-ply assembly. High purity slipcast silica showed some promise also.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 57-66
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 154
    facet.materialart.
    Unknown
    Optical Analysis of Cassegrainian Point Focus Concentrators (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A Cassegrainian solar concentrator, using a 7-meter diameter primary reflector, was analyzed in three forms: (1) an unmodified Cassegrainian, (2) the Ritchey-Chretien configuration, and (3) the unmodified Cassegrainian with a non-imaging tertiary reflector. Optical performance was not significantly improved with the Ritchey-Chretien; however, the tertiary resulted in significant improvement in intercept factor and optical efficiency. The effects of misalignment of the secondary and tertiary reflectors on the optical performance of the collector were also analyzed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 38-46
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 155
    facet.materialart.
    Unknown
    Concentrator Development (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: During the years of technology development by the Parabolic Dish program, the problems peculiar to tracking dishes have been explored in depth with particular emphasis on economics. Starting with the Precursor Concentrator, testing techniques and apparatus such as calorimeters and the flux mapper were developed. At the same time, mirrors were developed to have a long operating life as well as high performance. Commercially available equipment was evaluated as well. Building on all these elements, the Test Bed Concentrators were designed and built. With a peak intensity in the focal plane of over 17,500 suns and an average concentrator ratio over 3000 on an eight inch diameter aperture, they have proven to be the work horses of the technology. With a readily adjustable mirror array, they have proved to be an essential tool in the development of dish components, receivers, heat transport systems, instrumentation, controls, engines, and materials - all necessary to cost effective modules and plants. Utilizing the lessons learned from this technology, most cost effective systems were designed. These included Parabolic Dish Number 1 (PDC-1) and PDC-2 currently in final design by Acurex Corporation. Even more advanced concepts are being worked on, such as the Cassegranian systems by BDM Corporation.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 14
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 156
    facet.materialart.
    Unknown
    Parabolic Dish Concentrator (PDC-1) (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The design, construction, and installation of the Parabolic Dish Concentrator, Type 1 (PDC-1) has been one of the most significant JPL concentrator projects because of the knowledge gained about this type of concentrator and the development of design, testing, and analysis procedures which are applicable to all solar concentrator projects. The need for these procedures was more clearly understood during the testing period which started with the prototype panel evaluation and ended with the performance characterization of the completed concentrator. For each phase of the test program, practical test procedures were required and these procedures defined the mathematical analysis which was essential for successful concentrator development. The concentrator performance appears to be limited only by the distortions resulting from thermal gradients through the reflecting panels. Simple optical testing can be extremely effective, but comprehensive mechanical and optical analysis is essential for cost effective solar concentrator development.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 15
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 157
    facet.materialart.
    Unknown
    Solar Pond Overview (1984)
    In:  CASI
    Details
    Publication Date: 2016-03-09
    Description: The term solar pond is used to refer specifically to a salt-gradient solar pond. A technology assessment was done consisting of thermal performance; maintenance; applications; and economics. Research needs and recommendations were also included.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Salt-Gradient Solar Ponds; 19 p
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 158
    facet.materialart.
    Unknown
    Electrochemical storage (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The source of the problem within the individual single cell which is related to the stochastic properties of cell populations and to the actual electrochemistry and chemistry taking place is described. The complications which arise in multicell batteries to show how different electrochemistries might alleviate or accentuate these problems is described. The concept of the electrochemical system is introduced to show how certain shortcomings of the single cell/battery string concept can be circumvented. Some of these electrochemical systems permit performance characteristics that are impossible by using conventional battery design philosophies. Projections for energy density and performance characteristics of the concepts are addressed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Space Photovoltaic Res. and Technol. 1983; p 235
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 159
    facet.materialart.
    Unknown
    Solar array: Plasma interactions (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Interactions between space systems and their orbital particle and field environments have significant impact on the system's operation and life. Interactions such as radiation damage and aerodynamic drag are considered in designing space systems. There are, however, a number of orbital environmental interactions which become important design considerations only for large or high power systems. Their impact is assessed to ensure successful design. Interactions between higher voltage solar arrays and the space plasma which are of critical concern in designing large orbital photovoltaic power systems are outlined.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Space Photovoltaic Res. and Technol. 1983; p 236
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 160
    facet.materialart.
    Unknown
    Plasmon device design: Conversion from surface to junction plasmons with grating-couplers (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Scaling calculations and numerical studies are used to show that grating couplers provide effective energy transfer between surface plasmons and slower modes localized in the tunnel diodes. Within first order perturbation theory in grating amplitude, 90% efficiency energy transfer occurs within micrometers for realistic structures and materials parameters. Scaling laws are derived. Seventy to 90% of the electromagnetic field energy is concentrated in the oxide layer of an MOM diode after the energy is distributed by longer range modes that have less than 0.1% overlap with the tunneling region. The mode conversion allows the requirements separation for energy transport and power production by inelastic tunneling.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Space Photovoltaic Res. and Technol. 1983; p 155
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 161
    facet.materialart.
    Unknown
    Research directions and progress in SERI advanced high efficiency concepts program (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Novel solar cell designs and materials with the objective of achieving the maximum attainable photovoltaic conversion efficiencies are researched. Laboratory demonstrations of solar cells of greater than 30% efficiency under concentrated sunlight and thin film solar cells with one sun efficiencies of 17 to 20% are sought. These demonstrations are necessary intermediate steps towards the realization of very high efficiency, multi-bandgap, thin-film solar cells. Conversion efficiencies above 30% could be achieved by a cascade multijunction cell consisting of a high bandgap (1.7 eV) cell coupled optically and electrically on top of a lower bandgap (1.1 eV) cell. Recent improvements in peak currents of this interconnect are quite promising. However, this cell structure poses difficult problems for materials fabrication as a result of the combined requirements of choice of bandgaps, low defect density material, and high doping densities. Recent improvements in the quality of materials and newly proposed cell structures which may simplify fabrication are significant steps in the development of the multijunction concentrator solar cell.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Lewis Research Center Space Photovoltaic Res. and Technol. 1983; p 118-119
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 162
    facet.materialart.
    Unknown
    MOD-5A wind turbine generator program design report: Volume 1: Executive Summary (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The design, development and analysis of the 7.3 MW MOD-5A wind turbine generator covering work performed between July 1980 and June 1984 is discussed. The report is divided into four volumes: Volume 1 summarizes the entire MOD-5A program, Volume 2 discusses the conceptual and preliminary design phases, Volume 3 describes the final design of the MOD-5A, and Volume 4 contains the drawings and specifications developed for the final design. Volume 1, the Executive Summary, summarizes all phases of the MOD-5A program. The performance and cost of energy generated by the MOD-5A are presented. Each subsystem - the rotor, drivetrain, nacelle, tower and foundation, power generation, and control and instrumentation subsystems - is described briefly. The early phases of the MOD-5A program, during which the design was analyzed and optimized, and new technologies and materials were developed, are discussed. Manufacturing, quality assurance, and safety plans are presented. The volume concludes with an index of volumes 2 and 3.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-174734 , DOE/NASA-0153/1 , NAS 1.26:174734
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 163
    facet.materialart.
    Unknown
    Power system applications of fiber optics (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Power system applications of optical systems, primarily using fiber optics, are reviewed. The first section reviews fibers as components of communication systems. The second section deals with fiber sensors for power systems, reviewing the many ways light sources and fibers can be combined to make measurements. Methods of measuring electric field gradient are discussed. Optical data processing is the subject of the third section, which begins by reviewing some widely different examples and concludes by outlining some potential applications in power systems: fault location in transformers, optical switching for light fired thyristors and fault detection based on the inherent symmetry of most power apparatus. The fourth and final section is concerned with using optical fibers to transmit power to electric equipment in a high voltage situation, potentially replacing expensive high voltage low power transformers. JPL has designed small photodiodes specifically for this purpose, and fabricated and tested several samples. This work is described.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-176831 , JPL-PUBL-84-28 , NAS 1.26:176831 , DOE/ET-29372/4
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 164
    facet.materialart.
    Unknown
    Development of a microprocessor controller for stand-alone photovoltaic power systems (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A controller for stand-alone photovoltaic systems has been developed using a low power CMOS microprocessor. It performs battery state of charge estimation, array control, load management, instrumentation, automatic testing, and communications functions. Array control options are sequential subarray switching and maximum power control. A calculator keypad and LCD display provides manual control, fault diagnosis and digital multimeter functions. An RS-232 port provides data logging or remote control capability. A prototype 5 kW unit has been built and tested successfully. The controller is expected to be useful in village photovoltaic power systems, large solar water pumping installations, and other battery management applications.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-174723 , DOE/NASA/0310-1 , NAS 1.26:174723
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 165
    facet.materialart.
    Unknown
    Solar Pond Research at Argonne National Laboratory (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-13
    Description: Focus is on applications that utilize the seasonal heat-storage capability of the solar pond for low-temperature thermal processes, however the results of the research are directly applicable to electricity-generating and other applications. Important technical results are summarized.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Salt-Gradient Solar Ponds; 6 p
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 166
    facet.materialart.
    Unknown
    Solar Pond Fluid Dynamics and Heat Transfer (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-13
    Description: The primary objective of the solar pond research was to obtain an indepth understanding of solar pond fluid dynamics and heat transfer. The key product was the development of a validated one-dimensional computer model with the capability to accurately predict time-dependent solar pond temperature, salinities, and interface motions. Laboratory scale flow visualization experiments were conducted to better understand layer motion. Two laboratory small-scale ponds and a large-scale outdoor solar pond were designed and built to provide quantitative data. This data provided a basis for validating the model and enhancing the understanding of pond dynamic behavior.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Salt-Gradient Solar Ponds; 33 p
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 167
    facet.materialart.
    Unknown
    Material Selection Considerations for Solar Ponds (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-13
    Description: Among the various candidate materials tested, stainless steel shows the best potential for applications as heat exchanger components in solar ponds. Even stainless steel may lead to pitting type of corrosion. Weight loss measurements are probably unsatisfactory for corrosion evaluation in solar pond situations. Also included are the results from the potentiodynamic anodic polarization analysis, corrosion rate calculation via corrosion behavior diagrams, and immersion weight loss measurements.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Site-Specific Res. Conducted in Support of the Salton Sea Solar Pond Proj., FY 1982 Rept.; 16 p
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 168
    facet.materialart.
    Unknown
    Analytical Models (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-13
    Description: A system-level design and analysis model was developed. This model was conceived to have several key elements: a solar pond thermodynamic performance model, a power generation subsystem model, and an economic analysis element. The basic approach was to create these elements or modules and refine them on an individual basis yet retain the capability to easily couple them into a full system design model. This building block approach allows for maximum flexibility and substitution of refined descriptions as the technology develops. A general overview of interconnecting these subsystem models is presented. The primary program control element will perform the administrative functions of data input, data output, information storage and transfer, and sequential calling of the subsystem models. From the point of view of the requirements of a system design model, a power conversion subsystem model was developed. The goal of the effort was a preliminary subsystem model compatible with the solar pond subsystem model so that a first order system simulation analysis could be performed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Site-Specific Res. Conducted in Support of the Salton Sea Solar Pond Proj., FY 1982 Rept.; 4 p
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 169
    facet.materialart.
    Unknown
    Salton Sea Solar Pond Power Plant Design Study and Regional Applicability (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-13
    Description: Ormat collected and organized the data base and conducted conceptual plant design, performance, and cost analysis. JPL conducted site-specific studies related to solar pond chemistry, soil biological activity, and dike design and construction. WESTEC conducted environmental investigation studies and performed an environmental assessment. SCE provided planning support for licensing and permitting and technical evaluations of the system design and cost estimate.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Salt-Gradient Solar Ponds; 30 p
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 170
    facet.materialart.
    Unknown
    Review of SERI Solar Pond Work (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-13
    Description: Development of models of pond thermal performance; analysis of solar pond use for building space heat and hot water production; use of low-temperature pond-produced heat for industrial processes, desalination, and electricity production; development of direct-contact heat exchanger to reduce conversion equipment cost; determination of effects of extracted heat and mass from the storage layer on pond performance; and investigation of factors which determine gradient layer stability and the stability of this interface between this level and the upper and lower convecting layers were described.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Salt-Gradient Solar Ponds; 12 p
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 171
    facet.materialart.
    Unknown
    The Spectrophotometric Method of Determining the Transmission of Solar Energy in Salt Gradient Solar Ponds (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-13
    Description: In order to predict the thermal efficiency of a solar pond it is necessary to know total average solar energy reaching the storage layer. One method for determining this energy for water containing dissolved colored species is based upon spectral transmission measurements using a laboratory spectrophotometer. This method is examined and some of the theoretical ground work needed to discuss the measurement of transmission of light water. Results of in situ irradiance measurements from oceanography research are presented and the difficulties inherent in extrapolating laboratory data obtained with ten centimeter cells to real three dimensional pond situations is discussed. Particular emphasis is put on the need to account for molecular and particulate scattering in measurements done on low absorbing solutions. Despite these considerations it is expected that attenuation calculations based upon careful measurements using a dual beam spectrophotometer technique combined with known attenuation coefficients will be useful in solar pond modeling and monitoring for color buildup. Preliminary results using the CSM method are presented.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Site-Specific Res. Conducted in Support of the Salton Sea Solar Pond Proj., FY 1982 Rept.; 41 p
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 172
    facet.materialart.
    Unknown
    Photovoltaic Working Group Report (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-13
    Description: Results of the photovoltaic subcommittee meeting are summarized. The specific topics addressed include solar cell development and efficiency evaluation, concentrator arrays and array structural technology, and environmental interaction problems.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Lewis Research Center Space Power; p 285-291
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 173
    facet.materialart.
    Unknown
    Summary of Salt-gradient Solar Pond Research (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-13
    Description: Abstracts and summaries of 18 different studies of various aspects of solar pond design and operation are included.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Salt-Gradient Solar Ponds; 22 p
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 174
    facet.materialart.
    Unknown
    A Summary Description of a Computer Program Concept for the Design and Simulation of Solar Pond Electric Power Generation Systems (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-13
    Description: A solar pond electric power generation subsystem, an electric power transformer and switch yard, a large solar pond, a water treatment plant, and numerous storage and evaporation ponds. Because a solar pond stores thermal energy over a long period of time, plant operation at any point in time is dependent upon past operation and future perceived generation plans. This time or past history factor introduces a new dimension in the design process. The design optimization of a plant must go beyond examination of operational state points and consider the seasonal variations in solar, solar pond energy storage, and desired plant annual duty-cycle profile. Models or design tools will be required to optimize a plant design. These models should be developed in order to include a proper but not excessive level of detail. The model should be targeted to a specific objective and not conceived as a do everything analysis tool, i.e., system design and not gradient-zone stability.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Site-Specific Res. Conducted in Support of the Salton Sea Solar Pond Proj., FY 1982 Rept.; 8 p
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 175
    facet.materialart.
    Unknown
    Laboratory Investigations (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-13
    Description: The primary objectives were to examine the site-specific physical, chemical, and biological factors that impact construction, durability and performance of the proposed 5-MW (sub e) solar pond system at the Salton Sea. The interactions of the water, salt, and soil of the site and on material compatibility were examined. Potential interactions of the water/brine and soil are particularly important because the pond will utilize the naturally occurring clays as a bottom seal. Although there is a considerable and growing solar pond literature, little written information deals with the important site-specific investigations of water, salt, and soil. Therefore, technical effort was directed toward identifying the factors that should be investigated and determining methods of investigation. As a result, a by-product was the development of an approach for site-specific investigations and some specific methodologies. This development should continue in order to establish a generic approach for evaluating the suitability of any site for the construction of large-scale solar ponds.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Site-Specific Res. Conducted in Support of the Salton Sea Solar Pond Proj., FY 1982 Rept.; 31 p
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 176
    facet.materialart.
    Unknown
    High Temperature Thermoelectric Energy Conversion (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-12
    Description: The electronic and thermal transport properties of the most promising material systems for high temperature thermoelectric energy conversion are discussed from a theoretical and experimental viewpoint. Rare earth chalcogenides and boron-rich borides are considered in terms of thermal conductivity and transport mechanisms. Rare earth chalcogenides are generally n-type semiconductors and boron-rich borides are generally p-type semiconductors.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Lewis Research Center Space Power; p 171-187
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 177
    facet.materialart.
    Unknown
    Dynamic Power Systems for Power Generation (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-12
    Description: The characteristics of dynamic power systems have considerable potential value, especially for the space station. The base of technology that makes these dynamic power systems practical is reviewed. The following types of power-generating systems are examined herein: organic Rankine cycle, potassium Rankine cycle, Brayton cycle, and Stirling cycle.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Space Power; p 137-149
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 178
    facet.materialart.
    Unknown
    Potential of Flywheels for Spacecraft Energy Storage (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-12
    Description: The use of flywheel systems for energy storage in spacecraft is considered. Energy density, efficiency, weight, voltage range, life, and reliability of flywheel systems are discussed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Lewis Research Center Space Power; p 101-113
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 179
    facet.materialart.
    Unknown
    Trends in Concentrator, Receiver, and Storage Development for Terrestrial Applications (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-12
    Description: The experience gained and the technical trends of the DOE-sponsored terrestrial solar thermal power systems project are summarized with respect to concentrator and receiver/storage development. Relevance of this experience to space power applications, and the perceived critical barriers of this technology, are discussed. It is concluded that, despite different objectives, the terrestrial program provides a strong basis of expertise valuable to space power applications development.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Lewis Research Center Space Power; p 115-135
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 180
    facet.materialart.
    Unknown
    Trends in Space Photovoltaic Technology (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-12
    Description: The current status of silicon and gallium arsenide (GaAs) solar cell technology is described, and anticipated near and far term projections of photovoltaic cell performance are provided. It is shown that current ultrathin silicon and near term GaAs solar cells provide substantial enhancement of planar solar array performance. The advantages of utililizing GaAs cells in high concentration arrays is discussed. Evidence is provided to support the view that photovoltaic offers a viable means of supporting long term space objectives.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Lewis Research Center Space Power; p 85-93
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 181
    facet.materialart.
    Unknown
    Interactions between volume and surface EM waves in layered structures (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Using light scattering spectroscopy, the interaction of Surface Plasmon Polariton SPP in silver films on a glass substrate is with the incident radiation and with optical phonons of an external medium in contact with the film. The mean free path and the field strength of SPP are determined. The same SPP plays an important role in light emitting tunnel junctions (LETJ) in which an electrical current is converted into Volume Electromagnetic Wave VEW. The efficiency of light emission from LETJ through a prism coupler rather than through surface roughness is discussed. The coupling between phonon surface polaritons (PhSP) and optical guided waves (OGW) in thin films of GaP is also examined.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Lewis Research Center Space Photovoltaic Res. and Technol. 1983; p 156
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 182
    facet.materialart.
    Unknown
    Influence of oxygen on defect production in electron-irradiated, boron-doped silicon (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Deep level transient spectroscopy (DLTS) measurements were made on float-zone and crucible-grown, boron-doped silicon irradiated with 1-MeV electrons. The minority carrier trap attributed to a boron-related state, was not seen in low-resistivity, float-zone silicon. However, a new majority carrier trap was observed in these samples. In the case of more lightly doped material the minority carrier trap was present, and its introduction rate was lower in float-zone than in crucible-grown silicon. For 1- and 10-ohm-cm float-zone material that was oxidized during processing, the introduction rates for this trap were comparable to those for crucible-grown silicon. This behavior indicates that the minority carrier trap involves oxygen and that it may be due to a boron-oxygen complex. The majority carrier trap seen in heavily doped, float-zone silicon may also involve boron but not oxygen. Observed trap concentrations suggest that oxygen content in the regions examined by DLTS is affected by processing techniques. Other differences were observed in defect production and annealing behavior of electron-irradiated, float-zone and crucible-grown silicon.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Lewis Research Center Space Photovoltaic Res. and Technol. 1983; p 90
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 183
    facet.materialart.
    Unknown
    Advanced multi-megawatt wind turbine design for utility application (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A NASA/DOE program to develop a utility class multimegawatt wind turbine, the MOD-5A, is described. The MOD-5A features a 400 foot diameter rotor which is teetered and positioned upwind of the tower; a 7.3 megawatt power rating with a variable speed electric generating system; and a redundant rotor support and torque transmission structure. The rotor blades were fabricated from an epoxy-bonded wood laminate material which was a successful outgrowth of the MOD-OA airfoil design. Preliminary data from operational tests carried out at the NASA Plumbrook test facility are presented.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 184
    facet.materialart.
    Unknown
    High-efficiency silicon solar cells (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Silicon solar cells are described which operate at energy conversion efficiencies independently measured at 18.7 percent under standard terrestrial test conditions (AM1.5, 100 mW/sq cm, 28 C). These are apparently the most efficient silicon cells fabricated to date. The high-efficiency results from a combination of high open-circuit voltage due to the careful attention paid to the passivation of the top surface of the cell, high fill factor due to the high open-circuit voltage and low parasitic resistance losses, and high short-circuit current density due to the use of shallow diffusions, a low grid coverage, and an optimized double layer antireflection coating.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: IEEE Transactions on Electron Devices (ISSN 0018-9383); ED-31; 679-683
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 185
    facet.materialart.
    Unknown
    An in-depth review of photovoltaic system performance models (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The features, strong points and shortcomings of 10 numerical models commonly applied to assessing photovoltaic performance are discussed. The models range in capabilities from first-order approximations to full circuit level descriptions. Account is taken, at times, of the cell and module characteristics, the orientation and geometry, array-level factors, the power-conditioning equipment, the overall plant performance, O and M effects, and site-specific factors. Areas of improvement and/or necessary extensions are identified for several of the models. Although the simplicity of a model was found not necessarily to affect the accuracy of the data generated, the use of any one model was dependent on the application.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: ASME PAPER 84-WA/SOL-12
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 186
    facet.materialart.
    Unknown
    Measured effects of wind turbine generation at the Block Island Power Company (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Data measurements made on the NASA MOD-OA 200-kw wind-turbine generator (WTG) installed on a utility grid form the basis for an overall performance analysis. Fuel displacement/-savings, dynamic interactions, and WTG excitation (reactive-power) control effects are studied. Continuous recording of a large number of electrical and mechanical variables on FM magnetic tape permit evaluation and correlation of phenomena over a bandwidth of at least 20 Hz. Because the wind-power penetration reached peaks of 60 percent, the impact of wind fluctuation and wind-turbine/diesel-utility interaction is evaluated in a worst-case scenario. The speed-governor dynamics of the diesel units exhibited an underdamped response, and the utility operation procedures were not altered to optimize overall WTG/utility performance. Primary findings over the data collection period are: a calculated 6.7-percent reduction in fuel consumption while generating 11 percent of the total electrical energy; acceptable system voltage and frequency fluctuations with WTG connected; and applicability of WTG excitation schemes using voltage, power, or VARS as the controlled variable.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 187
    facet.materialart.
    Unknown
    Conceptual design of a fixed-pitch wind turbine generator system rated at 400 kilowatts (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The design and cost aspects of a fixed pitch, 400 kW Wind Turbine Generator (WTG) concept are presented. Improvements in reliability and cost reductions were achieved with fixed pitch operation and by incorporating recent advances in WTG technology. The specifications for this WTG concept were as follows: (1) A fixed pitch, continuous wooden rotor was to be provided by the Gougeon Bros. Co. (2) An 8 leg hyperboloid tower that showed promise as a low cost structure was to be used. (3) Only commercially available components and parts that could be easily fabricated were to be considered. (4) Design features deemed desirable based on recent NASA research efforts were to be incorporated. Detailed costs and weight estimates were prepared for the second machine and a wind farm of 12 WTG's. The calculated cost of energy for the fixed pitch, twelve unit windfarm is 11.5 cents/kW hr not including the cost of land and access roads. The study shows feasibility of fixed pitch, intermediate power WTG operation.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-174877 , NAS 1.26:174877 , DOE/NASA/0006-1
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 188
    facet.materialart.
    Unknown
    Relative potentials of concentrating and two-axis tracking flat-plate photovoltaic arrays for central-station applications (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The purpose of this study is to assess the relative economic potentials of concenrating and two-axis tracking flat-plate photovoltaic arrays for central-station applications in the mid-1990's. Specific objectives of this study are to provide information on concentrator photovoltaic collector probabilistic price and efficiency levels to illustrate critical areas of R&D for concentrator cells and collectors, and to compare concentrator and flat-plate PV price and efficiency alternatives for several locations, based on their implied costs of energy. To deal with the uncertainties surrounding research and development activities in general, a probabilistic assessment of commercially achievable concentrator photovoltaic collector efficiencies and prices (at the factory loading dock) is performed. The results of this projection of concentrator photovoltaic technology are then compared with a previous flat-plate module price analysis (performed early in 1983). To focus this analysis on specific collector alternatives and their implied energy costs for different locations, similar two-axis tracking designs are assumed for both concentrator and flat-plate options.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-175889 , DOE/ET-20356/22 , JPL-5230-15 , JPL-PUB-85-16 , NAS 1.26:175889
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 189
    facet.materialart.
    Unknown
    Module performance and failure analysis area: Flat-plate solar array project (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A redesign of the initial (Group I) Mobile Solar Block V module was done and documented. Manufacturing experience and accelerated test data from Group I formed the basis for the redesign. Ten Block V Group II modules were submitted for evaluation and the results are presented.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-175689 , DOE/JPL-956335-1 , JPL-9950-977 , DRL-189 , DRD-SE-1 , NAS 1.26:175689
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 190
    facet.materialart.
    Unknown
    Sensitivities of projected 1980 photovoltaic system costs to major system cost drivers (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The sensitivity of projected 1990 photovoltaic (PV) system costs to major system cost drivers was examined. It includes: (1) module costs and module efficiencies; (2) area related balance of system (BOS) costs; (3) inverter costs and efficiencies; and (4) module marketing and distribution markups and system integration fees. Recent PV system cost experiences and the high costs of electricity from the systems are reviewed. The 1990 system costs are projected for five classes of PV systems, including four ground mounted 5-MWp systems and one residential 5-kWp system. System cost projections are derived by first projecting costs and efficiencies for all subsystems and components. Sensitivity analyses reveal that reductions in module cost and engineering and system integration fees seem to have the greatest potential for contributing to system cost reduction. Although module cost is clearly the prime candidate for fruitful PV research and development activities, engineering and system integration fees seem to be more amenable to reduction through appropriate choice of system size and market strategy. Increases in inverter and module efficiency yield significant benefits, especially for systems with high area related costs.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-175669 , JPL-PUBL-84-93 , NAS 1.26:175669 , DOE/ET-20356/20
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 191
    facet.materialart.
    Unknown
    Solar energy converter using surface plasma waves (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Sunlight is dispersed over a diffraction grating formed on the surface of a conducting film on a substrate. The angular dispersion controls the effective grating period so that a matching spectrum of surface plasmons is excited for parallel processing on the conducting film. The resulting surface plasmons carry energy to an array of inelastic tunnel diodes. This solar energy converter does not require different materials for each frequency band, and sunlight is directly converted to electricity in an efficient manner by extracting more energy from the more energetic photons.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NAS 1.71:LEW-13827-1
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 192
    facet.materialart.
    Unknown
    Solar powered actuator with continuously variable auxiliary power control (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A solar powered system is disclosed in which a load such as a compressor is driven by a main induction motor powered by a solar array. An auxiliary motor shares the load with the solar powered motor in proportion to the amount of sunlight available, is provided with a power factor controller for controlling voltage applied to the auxiliary motor in accordance with the loading on that motor. In one embodiment, when sufficient power is available from the solar cell, the auxiliary motor is driven as a generator by excess power from the main motor so as to return electrical energy to the power company utility lines.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NAS 1.71:MFS-25637-1
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 193
    facet.materialart.
    Unknown
    Saltless solar pond (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A solar pond adapted for efficiently trapping and storing radiant solar energy without the use of a salt concentration gradient in the pond is disclosed. A body of water which may be fresh, saline, relatively clear or turbid, is substantially covered by a plurality of floating honeycomb panels. The honeycomb panels are made of a material such as glass which is pervious to short wave solar radiation but impervious to infrared radiation. Each honeycomb panel includes a multitude of honeycomb cells. The honeycomb panels are divided into the elongated honeycomb cells by a multitude of intermediate plates disposed between a bottom plate and top plate of the panel. The solar pond is well suited for providing hot water of approximately 85 to 90 C temperature for direct heating applications, and for electrical power generation.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NAS 1.71:NPO-15808-1
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 194
    facet.materialart.
    Unknown
    Photovoltaic module encapsulation design and materials section, volume 2 (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Tests for chemical structure, material properties, water absorption, aging and curing agent of Ethylene Vinyl Acetate (EVA) and UV absorption studies are carried out. A computer model was developed for thermal optical modeling, to investigate dependence between module operating temperature and solar insolation, and heat dissapation behavior. Structural analyses were performed in order to determine the stress distribution under wind and heat conditions. Curves are shown for thermal loading conditions. An electrical isolation was carried out to investigate electrical stress aging of non-metallic encapsulation materials and limiting material flaws, and to develop a computer model of electrical fields and stresses in encapsulation materials. In addition, a mathematical model was developed and tests were conducted to predict hygroscopic and thermal expansion and contraction on a plastic coated wooden substrate. Thermal cycle and humidity freezing cycle tests, partial discharge tests, and hail impact tests were also carried out. Finally, the effects of soiling on the surface of photovoltaic modules were investigated. Two antisoiling coatings, a fluorinated silane and perflourodecanoic acid were considered.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-173902 , DOE/JPL-1012-97-VOL-2 , JPL-PUB-84-34-VOL-2 , JPL-5101-237-VOL-2 , NAS 1.26:173902 , DE84-014963
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 195
    facet.materialart.
    Unknown
    Materials for high-temperature thermoelectric conversion (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The development of materials for high temperature thermoelectric energy conversion devices was investigated. The development of new criteria for the selection of materials which is based on understanding of the fundamental principles governing the behavior of high temperature thermoelectric materials is discussed. The synthesis and characterization of promising new materials and the growth of single crystals to eliminate possible problems associated with grain boundaries and other defects in polycrystalline materials are outlined.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-173969 , NAS 1.26:173969 , CMR-P-84-3
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 196
    facet.materialart.
    Unknown
    Survey of manufacturers of high-performance heat engines adaptable to solar applications (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results of an industry survey made during the summer of 1983 are summarized. The survey was initiated in order to develop an information base on advanced engines that could be used in the solar thermal dish-electric program. Questionnaires inviting responses were sent to 39 companies known to manufacture or integrate externally heated engines. Follow-up telephone communication ensured uniformity of response. It appears from the survey that the technology exists to produce external-heat-addition engines of appropriate size with thermal efficiencies of over 40%. Problem areas are materials and sealing.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-173911 , JPL-PUB-84-46 , DOE/JPL-1060/75 , NAS 1.26:173911
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 197
    facet.materialart.
    Unknown
    Wind loading on solar concentrators: Some general considerations (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A survey was completed to examine the problems and complications arising from wind loading on solar concentrators. Wind loading is site specific and has an important bearing on the design, cost, performance, operation and maintenance, safety, survival, and replacement of solar collecting systems. Emphasis herein is on paraboloidal, two-axis tracking systems. Thermal receiver problems also are discussed. Wind characteristics are discussed from a general point of view. Current methods for determining design wind speed are reviewed. Aerodynamic coefficients are defined and illustrative examples are presented. Wind tunnel testing is discussed, and environmental wind tunnels are reviewed. Recent results on heliostat arrays are reviewed as well. Aeroelasticity in relation to structural design is discussed briefly.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-173896 , JPL-PUB-83-101 , DOE/JPL-1060/66 , NAS 1.26:173896
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 198
    facet.materialart.
    Unknown
    Multi-100kW: Planar low cost solar array development (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Seven low cost multi-100 kW planar solar array modules were fabricated and tested. Two different designs were used, demonstrating advanced solar array construction practices. Both module types utilized second generation gridded back cells featuring high efficiency and IR transparency. A silicon dioxide AR coating optimized for transmission at gamma = 1.7 microns was applied to the back surface. Two interconnect types, a single sheet printed circuit and a roll type, with alternate approaches to increasing transparency and reducing cost were designed and fabricated. Hinge stress and electrical power optimization were also examined. Two point designs were studied. The first design used a coilage longeron mast and is autonomously deployable. The second design used a Stac Beam for high natural frequency response and required astronaut assistance and assembly on orbit. It was conclusively demonstrated that planar arrays are the most cost effective design for use on the space station or other high power applications.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-171119 , NAS 1.26:171119 , LMSC-D973431
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 199
    facet.materialart.
    Unknown
    Development of a lightweight nickel electrode (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Nickel electrodes made using lightweight plastic plaque are about half the weight of electrodes made from state of the art sintered nickel plaque. This weight reduction would result in a significant improvement in the energy density of batteries using nickel electrodes (nickel hydrogen, nickel cadmium and nickel zinc). These lightweight electrodes are suitably conductive and yield comparable capacities (as high as 0.25 AH/gm (0.048 AH/sq cm)) after formation. These lightweight electrodes also show excellent discharge performance at high rates.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-86861 , E-1967 , NAS 1.15:86861
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 200
    facet.materialart.
    Unknown
    Anion permselective membrane (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Two polymer ion exchange membranes were synthesized to fulfill the needs of both electrical resistivity and anolyte/catholyte separation for utility load leveling utilizing the DOE/NASA mixed electrolyte REDOX battery. Both membranes were shown to meet mixed electrolyte utility load leveling criteria. Several modifications of an anion exchange membrane failed to meet utility load leveling REDOX battery criteria using the unmixed electrolyte REDOX cell.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-174725 , DOE/NASA/0264-1 , NAS 1.26:174725
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...