Space vehicle freezer including heat exchange unit space use

Details Space vehicle freezer including heat exchange unit space use Space vehicle freezer including heat exchange unit space use

1997-06-03

1999-08-31

Capossela, Ronald

Refrigeration

Air compressor, cooler and expander type

Motor-type expander

165 4, 165 10, F25D 900

Patent

active

059438770

ABSTRACT:
A gravity independent space vehicle freezer system which is adapted to provide optimal heat exchange to a medium to be cooled. The space vehicle freezer includes a heat exchange unit located in a housing or cold space, compressor, expander and electric motor. The expander allows the compressed refrigerant to expand at constant entropy instead of constant enthalpy, allowing the refrigerant gas to expand down to a very lower temperature. As a result, the compressed refrigerant can reject heat at a higher temperature prior to expanding to the necessary freezing temperature, thus reducing the size of radiators and providing critical weight and cost savings. The work produced by the expander is directed to the compressor to reduce the work load of the electric motor powering the compressor. The heat exchange unit includes a liner member routing the liquid refrigerant along the heat transfer surface, thereby isolating the evaporation process and overcoming the problem of separating liquid from gas in zero gravity. As a result of this process, the time required for the heat transfer process is decreased, thereby allowing for more effective cooling of the product.

REFERENCES:
patent: 4665973 (1987-05-01), Limberg et al.
patent: 5150585 (1992-09-01), Markiewicz

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