Cryogenic cooling system

Details Cryogenic cooling system Cryogenic cooling system

1988-02-11

1989-05-02

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Liquefaction

62 32, 62264, 62467, 165156, 165168, F25B 1900

Patent

active

048256676

ABSTRACT:
A compact, reliable, and efficient cryogenic cooling system that can provide cryogenic cooling for a variety of desirable uses. The system is particularly desirable to provide cooling for infrared detectors in temperature ranges from 40K to 77K, and may be advantageously used in multi-stage systems to produce temperatures as low as 5K. In cryogenic cooling systems using a compressor and Joule-Thomson valves, working fluids, such as nitrogen, can be precooled to temperatures substantially below 165K at the input to a Joule-Thomson valve, and the power input to systems of our invention providing cooling 77K, for example, can be reduced by a factor of 4.5. In closed loop systems, a precooler between the compressor and the Joule-Thomson valve cools the working fluid by heat exchange between the working fluid flowing from the compressor to the Joule-Thomson valve and the working fluid returning from the load to the compressor, and by a further heat exchange between the working fluid flowing from the compressor to the Joule-Thomson valve and a cooling means conductively coupled to the working fluid. The cooling means can comprise a plurality of conductive heat paths-forming means that are conductively coupled to the working fluid flowing from the compressor to the Joule-Thomson valve and a plurality of thermo-electric coolers for removing heat from the conductive heat path-forming means.

REFERENCES:
patent: 2699043 (1955-01-01), Kramer
patent: 2764876 (1956-10-01), Parcaro
patent: 3613387 (1971-10-01), Collins

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