Abstract
Simple heating and cooling of chemisorption and physisorption compressors provides 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. The Jet Propulsion Laboratory (JPL) is presently pursuing a wide range of research related to this potentially very long life, vibrationless cooling system. System life tests are under way on Pr 1− n Ce n O x / O 2 (PCO/O 2) 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. In addition, production techniques for a high purity and efficient saran carbon sorbent are being developed. To improve efficiency, various compressor heat regeneration techniques have been developed and are currently being analysed. Preliminary analysis of a PCO/O 2 + C/Kr refrigerator indicates a total specific power requirement of only 56 W W −1 for 65 K cooling if an upper C/Xe stage is added and if PCO compressor waste heat is regenerated to power the C/Kr and C/Xe compressors. Advanced sorption refrigerator concepts are also being studied, such as an extremely efficient, closed cycle 7–10 K solid hydrogen sublimation refrigerator.
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