A Liquid-Nitrogen-Operated Refrigerator for Temperatures Below 77°K
Most devices refrigerated to below 20°K are provided with radiation shielding at some higher temperature, say 77°K, to intercept the radiation heat load from normally room-temperature bounding surfaces, and the refrigeration required at the radiation shield is generally many times that required at the lower temperatures. This is, of course, the reason for using a shield. In many applications, such as cryopumped space simulation chambers or helium liquefiera, the refrigeration for the radiation shield is provided by a liquid-nitrogen phase change.
KeywordsHeat Exchanger Heat Input Pressure Vessel Radiation Shield Intermediate Volume
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