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Helium Refrigeration and Liquefaction Using a Liquid Hydrogen Refrigerator for Precooling

Dudley B. Chelton

出版	U.S. Department of Commerce, National Bureau of Standards, 1960
URL	http://books.google.com.hk/books?id=1d_GNo5PyBcC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

Consideration is given to the use of a hydrogen refrigerator to assist in the production of temperatures below those obtained with hydrogen. A hydrogen refrigerator is used to maintain a precooling evaporator at or near 21° K in a helium gas circuit. The helium circuit may be arranged to produce liquid for external use or to produce refrigeration between 21° K and 4.2° K in a closed system. Charts have been developed that show the requirements of the composite helium: hydrogen system and the effect of heat exchanger performance. The relative quantities of refrigeration (hydrogen and helium) at various temperature levels have been determined.