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  • ENERGY PRODUCTION AND CONVERSION  (5)
  • 1975-1979  (5)
  • 1970-1974
  • 1
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    Study of the potential for improving the economics of hydrogen liquefaction through the use of centrifugal compressors and the addition of a heavy water plant (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An approach to the liquefaction of hydrogen was developed which permits the application of standard centrifugal compressors in place of reciprocating machines. A second fluid, such as propane, is added to the hydrogen prior to compression to form a mixture having a molecular weight much greater than that of hydrogen alone, so that a standard centrifugal compressor can be used. After compression, the mixture is cooled to cryogenic temperature levels where the propane condenses out of the mixture and is separated as a liquid. Since a small amount of deuterium is produced during hydrogen liquefaction, the potential of recovering deuterium and selling it as a co-product was investigated. Deuterium, in the form of heavy water, can be used in certain nuclear reactors as a neutron moderator to reduce the neutron velocity and enhance the probability of neutron collision with uranium nucleii.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-145282
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Status of the DOE /STOR/-sponsored national program on hydrogen production from water via thermochemical cycles (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A pure thermochemical cycle is a system of linked regenerative chemical reactions which accepts only water and heat and produces hydrogen. Thermochemical cycles are potentially a more efficient and cheaper means of producing hydrogen from water than is the generation of electricity followed by electrolysis. The Energy Storage Systems Division of the Department of Energy is currently funding a national program on thermochemical hydrogen production. The National Aeronautics and Space Administration is responsible for the technical management of this program. The goal is to develop a cycle which can potentially operate with an efficiency greater than 40% using a heat source providing a maximum available temperature of 1150 K. A closed bench-scale demonstration of such a cycle would follow. This cycle would be labeled a 'reference cycle' and would serve as a baseline against which future cycles would be compared.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Miami International Conference on Alternative Energy Sources; Dec 05, 1977 - Dec 07, 1977; Miami Beach, FL; US
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Status of the DOE (STOR)-sponsored national program on hydrogen production from water via thermochemical cycles (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The program structure is presented. The activities of the thermochemical cycles program are grouped according to the following categories: (1) specific cycle development, (2) support research and technology, (3) cycle evaluation. Specific objectives and status of on-going activities are discussed. Chemical reaction series for the production of hydrogen are presented. Efficiency and economic evaluations are also discussed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-78825 , E-9529 , Miami Intern. Conf. on Alternative Energy Sources; Dec 05, 1977 - Dec 07, 1977; Miami Beach, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A study of the efficiency of hydrogen liquefaction (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The search for an environmentally acceptable fuel to eventually replace petroleum-based fuels for long-range jet aircraft has singled out liquid hydrogen as an outstanding candidate. Hydrogen liquefaction is discussed, along with the effect of several operating parameters on process efficiency. A feasible large-scale commercial hydrogen liquefaction facility based on the results of the efficiency study is described. Potential future improvements in hydrogen liquefaction are noted.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: World Hydrogen Energy Conference; Mar 01, 1976 - Mar 03, 1976; Miami Beach, FL
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A study of the efficiency of hydrogen liquefaction (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The use of liquid hydrogen as a jet aircraft fuel has a number of environmental and technological advantages over conventional fuels. The liquefaction of hydrogen requires a large expenditure of energy. There are many inefficiencies that are a part of any practical liquefaction process. Current technology was investigated for the best available system. Parametric studies were made to identify where inefficiencies occur and to optimize and integrate the component parts. Flowsheets are presented for a module that produces 250 tons per day of liquid hydrogen. Approximately ten of these modules is needed for a major airport in the 1990's. The advantages of producing a product with a minimum amount of ortho to para hydrogen conversion are pointed out. The optimum degree of conversion was determined for a liquid hydrogen product that will be used within a given time. An assessment was made regarding the potentials for improvement of the processing schemes and equipment over the next 10 to 25 years.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Miami Univ. 1st World Hydrogen Energy Conf. Proc., Vol. 2; 25 p
    Format: text
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    NASA TECHNICAL REPORTS
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