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  • PHYSICAL SCIENCES  (3)
  • 2020-2023
  • 1990-1994  (3)
  • 1950-1954
  • 1910-1914
  • 1
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    Joule-Thomson Cooler Produces Nearly Constant Temperature (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Improved Joule-Thomson cooler maintains nearly constant temperature. Absolute-pressure relief valve helps stabilize temperature of cold head despite variations in atmospheric pressure. Feedback-controlled electrical heater provides additional stabilization. Demand-flow Joule-Thomson valve requires less nitrogen than fixed-orifice Joule-Thomson valve providing same amount of cooling. Provides stable low temperatures required for operation of such devices as tunable diode lasers in laboratory and balloon-borne instruments detecting contaminants in atmosphere.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-18184 , NASA Tech Briefs (ISSN 0145-319X); 16; 1; P. 41
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Mixed-Gas Sorption Joule-Thomson Refrigerator (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Proposed mixed-gas sorption Joule-Thomson refrigerator provides cooling down to temperature of 70 K. Includes only one stage and no mechanical compressor. Simpler, operates without vibrating, and consumes less power in producing same amount of cooling. Same sorption principle of operation applicable in compressor that chemisorbs oxygen or hydrogen from mixture with helium, neon, and/or other nonreactive gases.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-17569 , NASA Tech Briefs (ISSN 0145-319X); 15; 5; P. 38
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Reversible Chemisorption Gas-Gap Thermal Switch (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Gas/sorbent combinations provide means to turn heat-conduction paths on and off. Single-stage gas-gap thermal switch based on reversible chemisorption of hydrogen gas by ZrNiH. Two-stage gas-gap thermal switch based on reversible desorption of O2 from MnO2 in first stage, followed by absorption in Cu on zeolite in second stage. Requires relatively low power. Used in sorption refrigeration systems designed to operate for long times without maintenance.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-17568 , NASA Tech Briefs (ISSN 0145-319X); 15; 11; P. 54
    Format: text
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    NASA TECHNICAL REPORTS
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