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  • 1
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    Evaluation of thermal energy storage for the proposed Twin Cities District Heating system (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The technical and economic feasibility of incorporating thermal energy storage components into the proposed Twin Cities District heating project was evaluated. The technical status of the project is reviewed and conceptual designs of district heating systems with and without thermal energy storage were compared in terms of estimated capital requirements, fuel consumption, delivered energy cost, and environmental aspects. The thermal energy storage system is based on cogeneration and the storage of heat in aquifers.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Lewis Res. Center Thermal Energy Storage; p 283-295
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Development of a process for high capacity arc heater production of silicon for solar arrays (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A high temperature silicon production process using existing electric arc heater technology is discussed. Silicon tetrachloride and a reductant, liquid sodium, were injected into an arc heated mixture of hydrogen and argon. Under these high temperature conditions, a very rapid reaction occurred, yielding silicon and gaseous sodium chloride. Techniques for high temperature separation and collection of the molten silicon were developed. The desired degree of separation was not achieved. The electrical, control and instrumentation, cooling water, gas, SiCl4, and sodium systems are discussed. The plasma reactor, silicon collection, effluent disposal, the gas burnoff stack, and decontamination and safety are also discussed. Procedure manuals, shakedown testing, data acquisition and analysis, product characterization, disassembly and decontamination, and component evaluation are reviewed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-168933 , JPL-9950-491 , DOE/JPL-954589-80/9 , NAS 1.26:168933
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Development of advanced fuel cell system, phase 3 (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A multiple task research and development program was performed to improve the weight, life, and performance characteristics of hydrogen-oxygen alkaline fuel cells for advanced power systems. Gradual wetting of the anode structure and subsequent long-term performance loss was determined to be caused by deposition of a silicon-containing material on the anode. This deposit was attributed to degradation of the asbestos matrix, and attention was therefore placed on development of a substitute matrix of potassium titanate. An 80 percent gold 20 percent platinum catalyst cathode was developed which has the same performance and stability as the standard 90 percent gold - 10 percent platinum cathode but at half the loading. A hybrid polysulfone/epoxy-glass fiber frame was developed which combines the resistance to the cell environment of pure polysulfone with the fabricating ease of epoxy-glass fiber laminate. These cell components were evaluated in various configurations of full-size cells. The ways in which the baseline engineering model system would be modified to accommodate the requirements of the space tug application are identified.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-134818 , PWA-5201
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Development of advanced fuel cell system (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An experimental program was conducted continuing the development effort to improve the weight, life, and performance characteristics of hydrogen-oxygen alkaline fuel cells for advanced power systems. These advanced technology cells operate with passive water removal which contributes to a lower system weight and extended operating life. Endurance evaluation of two single cells and two, two-cell plaques was continued. Three new test articles were fabricated and tested. A single cell completed 7038 hours of endurance testing. This cell incorporated a Fybex matrix, hybrid-frame, PPF anode, and a 90 Au/10 Pt cathode. This configuration was developed to extend cell life. Two cell plaques with dedicated flow fields and manifolds for all fluids did not exhibit the cell-to-cell electrolyte transfer that limited the operating life of earlier multicell plaques.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-159443 , FCR-0398
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Development of advanced fuel cell system (phase 4) (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: For abstract, see N76-23686.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-135030S , FCR-0194
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Development of Advanced Fuel Cell System (Phase 4) (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A multiple-task research and development program was performed to improve the weight, life, and performance characteristics of hydrogen-oxygen alkaline fuel cells for advanced power systems. During Phase 4, the lowest stabilized degradation rate observed in all the testing completed during four phases of the program, 1 microvolt/hour, was demonstrated. This test continues after 5,000 hours of operation. The cell incorporates a PPf anode, a 90Au/10Pt cathode, a hybrid frame, and a Fybex matrix. These elements were developed under this program to extend cell life. The result demonstrated that the 80Au/20Pt cathode is as stable as a 90Au/10Pt cathode of twice the precious metal loading, was confirmed in full-scale cells. A hybrid frame two-cell plaque with dedicated flow fields and manifolds for all fluids was demonstrated to prevent the cell-to cell electrolyte transfer that limited the endurance of multicell plaques. At the conclusion of Phase 4, more than 90,900 hours of testing had been completed and twelve different cell designs had been evaluated. A technology base has been established which is ready for evaluation at the powerplant level.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-135030 , FCR-0165
    Format: application/pdf
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