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  • ENERGY PRODUCTION AND CONVERSION  (2,380)
  • Fisheries
  • 2020-2024  (8)
  • 1975-1979  (2,382)
  • 1
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    100-kW hingeless metal wind turbine blade design, analysis and fabrication (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The design, fabrication and analysis of aluminum wind turbine rotor blades is discussed. The blades are designed to meet criteria established for a 100-kilowatt wind turbine generator operating between 8 and 60-mile-per-hour speeds at 40 revolutions per minute. The design wind speed is 18 miles per hour. Two rotor blades are used on a new facility which includes a hingeless hub and its shaft, gearbox, generator and tower. Experience shows that, for stopped rotors, safe wind speeds are strongly dependent on blade torsional and bending rigidities which the basic D spar structural blade design provides. The 0.25-inch-thick nose skin is brake/bump formed to provide the basic 'D' spar structure for the tapered, twisted blades. Adequate margins for flutter and divergence are predicted from the use of existing, correlated stopped rotor and helicopter rotor analysis programs.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Annual National Forum; May 13, 1975 - May 15, 1975; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A 100 kW experimental wind turbine: Simulation of starting, overspeed, and shutdown characteristics (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The ERDA/NASA 100 kW experimental wind turbine is modeled on a digital computer in order to study the performance of a wind turbine under operating conditions. Simulation studies of starting, overspeed, and shutdown performance were made. From these studies operating procedures, precautions, and limitations are prescribed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-X-71864 , E-8629
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A 15 kWe (nominal) solar thermal-electric power conversion concept definition study: Steam Rankin reciprocator system (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A conceptual design of a 3600 rpm reciprocation expander was developed for maximum thermal input power of 80 kW. The conceptual design covered two engine configurations; a single cylinder design for simple cycle operation and a two cylinder design for reheat cycle operation. The reheat expander contains a high pressure cylinder and a low pressure cylinder with steam being reheated to the initial inlet temperature after expansion in the high pressure cylinder. Power generation is accomplished with a three-phase induction motor coupled directly to the expander and connected electrically to the public utility power grid. The expander, generator, water pump and control system weigh 297 kg and are dish mounted. The steam condenser, water tank and accessory pumps are ground based. Maximum heat engine efficiency is 33 percent: maximum power conversion efficiency is 30 percent. Total cost is $3,307 or $138 per kW of maximum output power.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-159591 , DOE/NASA/0063-79/1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A 15% efficient antireflection-coated metal-oxide-semiconductor solar cell (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A new effect is being developed which significantly improves the conversion efficiency of antireflection-coated metal-oxide-semiconductor (AMOS) solar cells. The effect, a marked increase in the open-circuit voltage, is produced by the addition of an oxide layer to the semiconductor. Cells using gold on n-type gallium arsenide have been made with efficiencies up to 15% in terrestrial sunlight. All processing steps are amenable to the use of low-cost polycrystalline films of GaAs in place of the single crystals now used.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Applied Physics Letters; 27; July 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A 15kWe (nominal) solar thermal electric power conversion concept definition study: Steam Rankine reheat reciprocator system (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An evaluation was made of the potential of a steam Rankine reheat reciprocator engine to operate at high efficiency in a point-focusing distributed receiver solar thermal-electric power system. The scope of the study included the engine system and electric generator; not included was the solar collector/mirror or the steam generator/receiver. A parametric analysis of steam conditions was completed leading to the selection of 973 K 12.1 MPa as the steam temperature/pressure for a conceptual design. A conceptual design was completed for a two cylinder/ opposed engine operating at 1800 rpm directly coupled to a commercially available induction generator. A unique part of the expander design is the use of carbon/graphite piston rings to eliminate the need for using oil as an upper cylinder lubricant. The evaluation included a system weight estimate of 230 kg at the mirror focal point with the condenser mounted separately on the ground. The estimated cost of the overall system is $1932 or $90/kW for the maximum 26 kW output.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-159590 , DOE/NASA/0062-79/1 , NAS-7845
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    A 200-kW wind turbine generator conceptual design study (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A conceptual design study was conducted to define a 200 kW wind turbine power system configuration for remote applications. The goal was to attain an energy cost of 1 to 2 cents per kilowatt-hour at a 14-mph site (mean average wind velocity at an altitude of 30 ft.) The costs of the Clayton, New Mexico, Mod-OA (200-kW) were used to identify the components, subsystems, and other factors that were high in cost and thus candidates for cost reduction. Efforts devoted to developing component and subsystem concepts and ideas resulted in a machine concept that is considerably simpler, lighter in weight, and lower in cost than the present Mod-OA wind turbines. In this report are described the various innovations that contributed to the lower cost and lighter weight design as well as the method used to calculate the cost of energy.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-79032 , DOE/NASA/1028-79/1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    A 5-GWe nuclear satellite power system conceptual design (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper presents the results of a brief study performed for MSFC on the conceptual design of a nuclear satellite power station which delivers 5 GWe net power to earth by microwave transmission. The system contains 26 modules each consisting of a reactor, fuel processing plant, Brayton PCU, space radiator, and nuclear shield. A high-temperature, gas-cooled, pebble-bed plutonium breeder concept was selected which is resupplied with fertile U-238. Sections of this core are periodically replaced and the spent fuel is chemically processed, the radioactive wastes separated, and stored for eventual space disposal. Fresh fuel pellets, formed from the U-238 and the bred plutonium, are recycled back to the reactor. The hot (1317 C) helium gas exiting the reactor serves as the working fluid in a 30%-efficient Brayton PCU.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Intersociety Energy Conversion Engineering Conference; Aug 20, 1978 - Aug 25, 1978; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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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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    NASA TECHNICAL REPORTS
  • 9
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    A comparison of GaAs and Si hybrid solar power systems (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Five different hybrid solar power systems using silicon solar cells to produce thermal and electric power are modeled and compared with a hybrid system using a GaAs cell. Among the indices determined are capital cost per unit electric power plus mechanical power, annual cost per unit electric energy, and annual cost per unit electric plus mechanical work. Current costs are taken to be $35,000/sq m for GaAs cells with an efficiency of 15% and $1000/sq m for Si cells with an efficiency of 10%. It is shown that hybrid systems can be competitive with existing methods of practical energy conversion. Limiting values for annual costs of Si and GaAs cells are calculated to be 10.3 cents/kWh and 6.8 cents/kWh, respectively. Results for both systems indicate that for a given flow rate there is an optimal operating condition for minimum cost photovoltaic output. For Si cell costs of $50/sq m optimal performance can be achieved at concentrations of about 10; for GaAs cells costing 1000/sq m, optimal performance can be obtained at concentrations of around 100. High concentration hybrid systems offer a distinct cost advantage over flat systems.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Solar Energy; 19; 3, 19; 1977
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    A comparison of GaAs and Si hybrid solar power systems (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An analytical comparison of energy output from various silicon and gallium arsenide hybrid solar power systems, producing electric power and also thermal power for heating or cooling, is made. System performance indices in terms of capital cost, peak power, total power output, and electric power were evaluated. Limiting values for annual energy production from GaAs and Si solar concentrator systems were estimated to be 2 cents and 6.8 cents per kWh for GaAs concentrator systems and between 2.5 cents and 11 cents per kWh for Si concentrator systems.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: International Symposium on Solar Energy; May 05, 1976 - May 07, 1976; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
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