Size and Power Requirements of 4.2°K Refrigerators
Liquid helium in an open system frequently is used to provide cooling at 4.2°K. In lieu of liquid helium supply systems which may be impractical for many applications (particularly, mobile, airborne, and space requirements), a refrigerator may be required to maintain the temperature of the apparatus. A survey has been made to determine the physical characteristics of such refrigerators. These characteristics are important because in practice they may limit the applicability and operating time of the equipment. Although the data acquired through the survey show considerable scatter, the expected trends can be detected and attempts have been made to establish guides by which the weight, volume, and power requirements may be estimated.
KeywordsLiquid Helium Power Requirement Thermodynamic Cycle Refrigeration Capacity Cryogenic Engineer
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