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  • ENERGY PRODUCTION AND CONVERSION  (399)
  • 1980-1984  (379)
  • 1970-1974  (20)
  • 1
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    A Conceptual Design Study of a High Temperature Solar Thermal Receiver (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A conceptual design was made for a solar thermal receiver capable of operation in the 1095 to 1650 C (2000 to 3000 F) temperature range. This receiver is designed for use with a two-axis paraboloidal concentrator in the 25 to 150 kW sub t power range, and is intended for industrial process heat, Brayton engines, or chemical/fuels reactions. Three concepts were analyzed parametrically. One was selected for conceptual design. Its key feature is a helical coiled tube of sintered silicon nitride which serves as the heat exchanger between the incident solar radiation and the working fluid. A mechanical design of this concept was prepared, and both thermal and stress analysis performed. The analysis showed good performance, low potential cost in mass production, and adaptability to both Brayton cycle engines and chemical/fuels production.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-168925 , JPL-9950-483 , NAS 1.26:168925 , GEEP-66
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    High-efficiency solar cells fabricated by vacuum MO-CVD (1984)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: High-efficiency, monolithic, two-color, three-terminal solar cells were fabricated by a novel growth technique, vacuum metal-organic chemical vapor deposition. The technique uses the expensive metal alkyls efficiently and toxic gases sparingly. The fact that the outer chamber is constructed of nonbreakable stainless steel is an attractive safety feature associated with this deposition system.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Lewis Research Center Space Photovoltaic Res. and Technol. 1983; p 148-154
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    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
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    NASA TECHNICAL REPORTS
  • 4
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    The United Stirling P40 engine for solar dish concentrator application (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The United Stirling P40 engine is a key component in a solar concentration based energy conversion system, to be demonstrated and tested during 1980-81. The inherent characteristics of modern Stirling engines is reviewed focusing on the baseline P40 double-acting engine. The extent of modifications required for the solar application is reviewed and performance data are predicted. Finally, the potential of an advanced solar Stirling engine is briefly considered.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the First Semiann. Distributed Receiver Program Rev.; p 113-117
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    NASA TECHNICAL REPORTS
  • 5
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    Li/SO2 Cell for Galileo (1981)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: Some information on the special process controls for lithium sulfur dioxide (Li/SO2) batteries is presented with reference to how those controls affected the Galileo probe program and the instrument test vehicle program. The general considerations that go into any application for basically any type of battery system are discussed. Particular emphasis is given to some of the design tradeoffs which resulted because of the addition of the safety characteristics of the Li/SO2 system.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Goddard Space Flight Center The 1980 Goddard Space Flight Center Battery Workshop; p 13-22
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    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
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    NASA TECHNICAL REPORTS
  • 7
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    Assessment of institutional barriers to the use of natural gas fuel in automotive vehicle fleets (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Institutional barriers to the use of natural gas as a fuel for motor vehicle fleets were identified. Recommendations for barrier removal were developed. Eight types of institutional barriers were assessed: (1) lack of a national standard for the safe design and certification of natural gas vehicles and refueling stations; (2) excessively conservative or misapplied state and local regulations, including bridge and tunnel restrictions, restrictions on types of vehicles that may be fueled by natural gas, zoning regulations that prohibit operation of refueling stations, parking restrictions, application of LPG standards to LNG vehicles, and unintentionally unsafe vehicle or refueling station requirements; (3) need for clarification of EPA's tampering enforcement policy; (4) the U.S. hydrocarbon standard; (5) uncertainty concerning state utility commission jurisdiction; (6) sale for resale prohibitions imposed by natural gas utility companies or state utility commissions; (7) uncertainty of the effects of conversions to natural gas on vehicle manufactures warranties; and (8) need for a natural gas to gasoline equivalent units conversion factor for use in calculation of state road use taxes.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-168183 , DOE/NASA/0295-1 , NAS 1.26:168183 , JACKFAU-83-302
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Performance of a steel spar wind turbine blade on the Mod-0 100 kW experimental wind turbine (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The performance and loading of a large wind rotor, 38.4 m in diameter and composed of two low-cost steel spar blades were examined. Two blades were fabricated at Lewis Research Center and successfully operated on the Mod-0 wind turbine at Plum Brook. The blades were operated on a tower on which the natural bending frequency were altered by placing the tower on a leaf-spring apparatus. It was found that neither blade performance nor loading were affected significantly by this tower softening technique. Rotor performance exceeded prediction while blade loads were found to be in reasonable agreement with those predicted. Seventy-five hours of operation over a five month period resulted in no deterioration in the blade.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-81588 , DOE/NASA/1028-27 , E-567
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    MHD oxidant intermediate temperature ceramic heater study (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The use of three types of directly fired ceramic heaters for preheating oxygen enriched air to an intermediate temperature of 1144K was investigated. The three types of ceramic heaters are: (1) a fixed bed, periodic flow ceramic brick regenerative heater; (2) a ceramic pebble regenerative heater. The heater design, performance and operating characteristics under conditions in which the particulate matter is not solidified are evaluated. A comparison and overall evaluation of the three types of ceramic heaters and temperature range determination at which the particulate matter in the MHD exhaust gas is estimated to be a dry powder are presented.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-165453 , DOE/NASA/0107-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Geothermal probabilistic cost study (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A tool is presented to quantify the risks of geothermal projects, the Geothermal Probabilistic Cost Model (GPCM). The GPCM model was used to evaluate a geothermal reservoir for a binary-cycle electric plant at Heber, California. Three institutional aspects of the geothermal risk which can shift the risk among different agents was analyzed. The leasing of geothermal land, contracting between the producer and the user of the geothermal heat, and insurance against faulty performance were examined.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-168757 , NAS 1.26:168757 , DE82-003230 , DOE/ET-37116/T4
    Format: application/pdf
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