Gas mixture for cryogenic applications

Details Gas mixture for cryogenic applications Gas mixture for cryogenic applications

1999-04-06

2000-06-13

Skane, Christine

Compositions

Vaporization, or expansion, refrigeration or heat or energy...

62 512, 62114, C09K 504

Patent

active

06074572&

ABSTRACT:
An optimum gas mixture formulated from a group of component fluids, for use in a miniature mixed gas refrigeration system. The gas mixture has appropriate components, in appropriate concentrations, to optimize refrigeration power and heat transfer capacity, and to minimize plugging of the Joule-Thomson expansion element. The gas mixture is pressurized by a compressor to a pressure less than 750 psia, and preferably less than 420 psia, for safety reasons, and supplied to a heat exchanger. The high pressure outlet of the heat exchanger is connected to a Joule-Thomson expansion element where the high pressure gas is expanded isenthalpically to a lower temperature at least as low as 183K. This low temperature gas cools a heat transfer element mounted in the distal end of the probe, to cool an external object. Return gas flows back through the heat exchanger to pre-cool the incoming high pressure gas mixture.

REFERENCES:
patent: 5269879 (1993-12-01), Rhoades et al.
patent: 5340490 (1994-08-01), Decaire et al.
patent: 5351499 (1994-10-01), Takemasa et al.
patent: 5758505 (1998-06-01), Dobak, III et al.
patent: 5766503 (1998-06-01), Shiflett et al.
patent: 5956958 (1999-09-01), Dobak, III et al.

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