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  • ENERGY PRODUCTION AND CONVERSION  (91)
  • 2015-2019
  • 1975-1979  (91)
  • 1950-1954
  • 1940-1944
  • 1930-1934
  • 1925-1929
  • 1978  (91)
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  • 2015-2019
  • 1975-1979  (91)
  • 1950-1954
  • 1940-1944
  • 1930-1934
    • +
Year
  • 1
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    Dual membrane hollow fiber fuel cell and method of operating same (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A gaseous fuel cell is described which includes a pair of electrodes formed by open-ended, ion-exchange hollow fibers, each having a layer of metal catalyst deposited on the inner surface and large surface area current collectors such as braided metal mesh in contact with the metal catalyst layer. A fuel cell results when the electrodes are immersed in electrolytes and electrically connected. As hydrogen and oxygen flow through the bore of the fibers, oxidation and reduction reactions develop an electrical potential. Since the hollow fiber configuration provides large electrode area per unit volume and intimate contact between fuel and oxidizer at the interface, and due to the low internal resistance of the electrolyte, high power densities can be obtained.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Effects of rotor location, coning, and tilt on critical loads in large wind turbines (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Several large (1500 kW) horizontal rotor configurations were analyzed to determine the effects on dynamic loads of upwind downwind rotor locations, coned and radial blade positions, and tilted and horizontal rotor axis positions. Loads were calculated for a range of wind velocities at three locations in the structure: (1) the blade shank; (2) the hub shaft; and (3) the yaw drive. Blade axis coning and rotor axis tilt were found to have minor effects on loads. However, locating the rotor upwind of the tower significantly reduced loads at all locations analyzed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Wind Turbine Structural Dyn.; p 227-236
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Hydrogen turbine power conversion system assessment (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A three part technical study was conducted whereby parametric technical and economic feasibility data were developed on several power conversion systems suitable for the generation of central station electric power through the combustion of hydrogen and the use of the resulting heat energy in turbogenerator equipment. The study assessed potential applications of hydrogen-fueled power conversion systems and identified the three most promising candidates: (1) Ericsson Cycle, (2) gas turbine, and (3) direct steam injection system for fossil fuel as well as nuclear powerplants. A technical and economic evaluation was performed on the three systems from which the direct injection system (fossil fuel only) was selected for a preliminary conceptual design of an integrated hydrogen-fired power conversion system.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-135298 , RI/RD77-252
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Evaluation of solar cells and arrays for potential solar power satellite applications (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Proposed solar array designs and manufacturing methods are evaluated to identify options which show the greatest promise of leading up to the develpment of a cost-effective SPS solar cell array design. The key program elements which have to be accomplished as part of an SPS solar cell array development program are defined. The issues focussed on are: (1) definition of one or more designs of a candidate SPS solar array module, using results from current system studies; (2) development of the necessary manufacturing requirements for the candidate SPS solar cell arrays and an assessment of the market size, timing, and industry infrastructure needed to produce the arrays for the SPS program; (3) evaluation of current DOE, NASA and DOD photovoltaic programs to determine the impacts of recent advances in solar cell materials, array designs and manufacturing technology on the candidate SPS solar cell arrays; and (4) definition of key program elements for the development of the most promising solar cell arrays for the SPS program.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-151740
    Format: application/pdf
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  • 5
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    Military applications of photovoltaic systems (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Applications of solar cell power systems at military facilities are presented. The construction and purpose of these different field test facilities are discussed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: OAO Corp. Proc. of the US DOE Photovoltaics Technol. Develop. and Appl. Program Rev.; p 1-195 - 1-209
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Solar concentrating properties of truncated hexagonal, pyramidal and circular cones (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The solar concentrating properties of specularly reflecting truncated pyramidal, hexagonal, and circular cones are evaluated. Pyramidal and hexagonal configurations are discussed with reference to the concentration factor as a function of half apex angle and the length of the side over the width, and to the irradiance distribution. Expressions are derived for the concentration factor and the irradiance at the base of a circular cone when the sunlight is incident normal to the aperture and for oblique incidence.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Applied Optics; 17; Aug. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Flat-sided rectilinear trough as a solar concentrator - An analytical study (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Formulas are derived for the concentration factor and irradiance distribution at the base of the flat-sided linear trough. Performance is affected by the number of reflections the solar rays undergo before reaching the base, the cone apex angle, and the coefficient of reflection. Results are presented graphically in such a way that one can choose the optimum configuration, which is the minimum material required, to achieve a given concentration factor. Practical concentration factors range from 1.5 to 4 depending on the geometry and coefficient of reflection.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Applied Optics; 17; June 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Hot forming of silicon sheet, silicon sheet growth development for the large area silicon sheet task of the low cost silicon solar array project (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The hot workability of polycrystalline silicon was studied. Uniaxail stress-strain curves are given for strain rates in the range of .0001 to .1/sec and temperatures from 1100 to 1380 C. At the highest strain rates at 1380 C axial strains in excess of 20% were easily obtainable without cracking. After deformations of 36%, recrystallization was completed within 0.1 hr at 1380 C. When the recrystallization was complete, there was still a small volume fraction of unrecyrstallized material which appeared very stable and may degrade the electronic properties of the bulk materials. Texture measurements showed that the as-produced vapor deposited polycrystalline rods have a 110 fiber texture with the 110 direction parallel to the growth direction and no preferred orientation about this axis. Upon axial compression perpendicular to the growth direction, the former 110 fiber axis changed to 111 and the compression axis became 110 . Recrystallization changed the texture to 110 along the former fiber axis and to 100 along the compression axis.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: ERDA/JPL-954506-78/1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Growth, evaluation and modeling of silicon-on-ceramic solar cells (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The silicon-on-ceramic (SOC) process uses inexpensive ceramic substrates to provide supported growth of silicon from the melt. The conditions for unidirectional solidification, the grain structure and other properties are quite similar to those of EFG silicon ribbon. Solar cells with interdigital electrodes have demonstrated AMl conversion efficiencies (active area) of 7.8% without AR coatings and 10.1% efficiencies with an AR coating of SiO. Mathematical modeling of the series resistance of cells shows the feasibility of making electrical contact to the base layer of the cell through slots in the substrate. However, series resistance in the base layer sets an upper limit on slot spacing for efficient cell performance.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Photovoltaic Specialists Conference; Jun 05, 1978 - Jun 08, 1978; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    A candidate low-cost processing sequence for terrestrial silicon solar cell panel (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Manufacturing sequence for silicon solar cells using Czochralsky crystal growing techniques in order to produce at a rate of 20 MW per year on a 24-hour per day basis is discussed. Cost analysis of the manufacturing is presented and consideration is given to the following processing decision categories of the manufacturing of an unencapsulated solar cell from a silicon wafer: (1) treatment of the optical surface; (2) formation of the junction(s); and (3) metallization of electrical collectors. The manufacturing of encapsulated solar modules from solar cells, using two glass plates, a low iron front surface, and a standard float glass back plate, is described. Totaling the three major activities of wafer making, cell manufacturing, and module fabrication, the resulting contribution to module price will be 1.945 $/watt.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Photovoltaic Specialists Conference; Jun 05, 1978 - Jun 08, 1978; Washington, DC
    Format: text
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