Cryogenic Refrigeration Concepts Utilizing Adsorption Pumping in Zeolites
Refrigeration without lubrication, vibration, and noise has heretofore been accomplished in at least three distinct forms; thermoelectric junctions that pump heat across a semiconductor PN junction , ammonia-water systems that remove heat in an adsorption-percolation-condensation-evaporation cycle , and chemisorption systems that exchange hydrogen from lanthanum-nickel and other metal hydrides to develop a pressure difference for circulation of hydrogen gas in a 20-K refrigerator [3,4]. While technically sound, these systems have a mix of advantages and disadvantages that render them unsuitable as the basis for complete cryogenic refrigeration cycles.
KeywordsMetal Hydride Refrigeration Cycle Cryogenic Engineer Desorption Phase Adsorption Isobar
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