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  • ENGINEERING (GENERAL)  (7)
  • Engineering (General)  (6)
  • 2020-2023
  • 1990-1994  (13)
  • 1950-1954
  • 1910-1914
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  • 1
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    Sorption cooler technology development at JPL (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Simple heating and cooling of chemisorption and physisorption compressors provide high pressure gas, which, when expanded through a Joule-Thomson (J- T) valve, can provide cooling from 0.3 to 200 K depending on the sorbent/gas combination. System life tests are under way on Pr(1-n)Ce(n)O(x)/O2 (PCO/O2) chemisorption compressors for 65-80 K cooling and on carbon/krypton (C/Kr) physisorption compressors for 120-140 K cooling. Investigations have been initiated to examine reliability physics issues related to critical compressor components such as sorbents, container materials and electrical heaters.
    Keywords: ENGINEERING (GENERAL)
    Type: Cryogenics (ISSN 0011-2275); 30; 239-245
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    NASA TECHNICAL REPORTS
  • 2
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    Dynamic Simulation of a Periodic 10 K Sorption Cryocooler (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: A transient thermal simulation model has been developed to simulate the dynamic performance of a multiple-stage 10 K sorption cryocooler for spacecraft sensor cooling applications that require periodic quick-cooldown (under 2 minutes) , negligible vibration, low power consumption, and long life (5 to 10 years). The model was specifically designed to represent the Brilliant Eyes Ten-Kelvin Sorption Cryocooler Experiment (BETSCE), but it can be adapted to represent other sorption cryocooler systems as well. The model simulates the heat transfer, mass transfer, and thermodynamic processes in the cryostat and the sorbent beds for the entire refrigeration cycle, and includes the transient effects of variable hydrogen supply pressures due to expansion and overflow of hydrogen during the cooldown operation. The paper describes model limitations and simplifying assumptions, with estimates of errors induced by them, and presents comparisons of performance predictions with ground experiments. An important benefit of the model is its ability to predict performance sensitivities to variations of key design and operational parameters. The insights thus obtained are expected to lead to higher efficiencies and lower weights for future designs.
    Keywords: Engineering (General)
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    NASA TECHNICAL REPORTS
  • 3
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    Ground Testing of a 10 K Sorption Cryocooler Flight Experiment (BETSCE) (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: The Brilliant Eyes Ten-Kelvin Sorption Cryocooler Experiment (BETSCE) is a Space Shuttle side-wall-mounted flight experiment designed to demonstrate 10 K sorption cryocooler technology in a space environment. The BETSCE objectives are to: (1) provide a thorough end-to-end characterization and space performance validation of a complete, multistage, automated, closed-cycle hydride sorption cryocooler in the 10 to 30 K temperature range, (2) acquire the quantitative microgravity database required to provide confident engineering design, scaling, and optimization, (3) advance the enabling technologies and resolve integration issues, and (4) provide hardware qualification and safety verification heritage. BETSCE ground tests were the first-ever demonstration of a complete closed-cycle 10 K sorption cryocooler. Test results exceeded functional requirements. This paper summarizes functional and environmental ground test results, planned characterization tests, important development challenges that were overcome, and valuable lessons-learned.
    Keywords: Engineering (General)
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    NASA TECHNICAL REPORTS
  • 4
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    Component Reliability Testing of Long-Life Sorption Cryocoolers (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: This paper summarizes ongoing experiments characterizing the ability of critical sorption cryocooler components to achieve highly reliable operation for long-life space missions. Test data obtained over the past several years at JPL are entirely consistent with achieving ten year life for sorption compressors, electrical heaters, container materials, valves, and various sorbent materials suitable for driving 8 to 180 K refrigeration stages. Test results for various compressor systems are reported. Planned future tests necessary to gain a detailed understanding of the sensitivity of cooler performance and component life to operating constraints, design configurations, and fabrication, assembly and handling techniques, are also discussed.
    Keywords: Engineering (General)
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    NASA TECHNICAL REPORTS
  • 5
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    Component Reliabilty Testing of Long-Life Sorption (1994)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Keywords: Engineering (General)
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    NASA TECHNICAL REPORTS
  • 6
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    Dynamic Simulation of a Periodic 10 K Sorption Cryocooler (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Keywords: Engineering (General)
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    NASA TECHNICAL REPORTS
  • 7
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    Ground Testing for a 10 K Sorption Cryocooler Flight Expeiment (BETSCE) (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Keywords: Engineering (General)
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    NASA TECHNICAL REPORTS
  • 8
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    Joule-Thomson cryogenic cooler with extremely high thermal stability (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An 80-K Joule-Thomson (J-T) cooling system designed for the Probe Infrared Laser Spectrometer (PIRLS) proposed for the Huygens Titan Probe of the Cassini Saturn orbiter mission is presented. The cryogenic cooling requirements of the PIRLS instrument are listed, and the cooler system design including details of a J-T cryostat, cold head, and dewar design is described along with the results of a thermal modeling effort and lab cooler performance testing. It is shown that by using active feedback temperature control of the cold head in combination with the self-regulating action of the J-T cryostat, a temperature stability of less than 0.1 mK/min is achieved by the cooler weighting 1.8 kg.
    Keywords: ENGINEERING (GENERAL)
    Type: AIAA PAPER 91-1427
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Three-stage sorption type cryogenic refrigeration systems and methods employing heat regeneration (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A three-stage sorption type cryogenic refrigeration system, each stage containing a fluid having a respectively different boiling point, is presented. Each stage includes a compressor in which a respective fluid is heated to be placed in a high pressure gaseous state. The compressor for that fluid which is heated to the highest temperature is enclosed by the other two compressors to permit heat to be transferred from the inner compressor to the surrounding compressors. The system may include two sets of compressors, each having the structure described above, with the interior compressors of the two sets coupled together to permit selective heat transfer therebetween, resulting in more efficient utilization of input power.
    Keywords: ENGINEERING (GENERAL)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Multicomponent gas sorption Joule-Thomson refrigeration (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The present invention relates to a cryogenic Joule-Thomson refrigeration capable of pumping multicomponent gases with a single stage sorption compressor system. Alternative methods of pumping a multicomponent gas with a single stage compressor are disclosed. In a first embodiment, the sorbent geometry is such that a void is defined near the output of the sorption compressor. When the sorbent is cooled, the sorbent primarily adsorbs the higher boiling point gas such that the lower boiling point gas passes through the sorbent to occupy the void. When the sorbent is heated, the higher boiling point gas is desorbed at high temperature and pressure and thereafter propels the lower boiling point gas out of the sorption compressor. A mixing chamber is provided to remix the constituent gases prior to expansion of the gas through a Joule-Thomson valve. Other methods of pumping a multicomponent gas are disclosed. For example, where the sorbent is porous and the low boiling point gas does not adsorb very well, the pores of the sorbent will act as a void space for the lower boiling point gas. Alternatively, a mixed sorbent may be used where a first sorbent component physically adsorbs the high boiling point gas and where the second sorbent component chemically absorbs the low boiling point gas.
    Keywords: ENGINEERING (GENERAL)
    Format: application/pdf
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