Super critical helium refrigeration process and apparatus

Details Super critical helium refrigeration process and apparatus Super critical helium refrigeration process and apparatus

1981-05-15

1982-08-31

Capossela, Ronald C.

Refrigeration

Processes

Compressing, condensing and evaporating

62 38, 62514R, F25B 500

Patent

active

043465633

ABSTRACT:
A closed loop refrigeration process and apparatus provides a large flow of cold, supercritical gas through a device which is to be cooled at cryogenic temperatures. The output of helium gas from a compressor is precooled with liquid nitrogen and divided into two streams which are cooled by expansion and by heat exchange with the return flow of helium to the compressor. The two streams are recombined and further cooled by heat exchange with the return flow and a liquid helium bath. The entire output of the compressor, at liquid helium temperature and above critical pressure, is forced through the load. The stream is then expanded through a valve where partial liquefaction takes place to replenish the liquid helium cooling bath. Gaseous helium is drawn off from the liquid helium bath and recycled through the heat exchangers back to the compressor.

REFERENCES:
patent: 3611740 (1971-10-01), Giger
patent: 3613387 (1971-10-01), Collins
patent: 4048814 (1977-09-01), Quack
patent: 4161107 (1979-07-01), Korsakov et al.
patent: 4189930 (1980-02-01), Davydov et al.
patent: 4267701 (1981-05-01), Toscano

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