F - Mech Eng,Light,Heat,Weapons – 17 – C
Patent
F - Mech Eng,Light,Heat,Weapons
17
C
F17C 9/04 (2006.01) F25D 3/10 (2006.01) F25D 21/00 (2006.01) F25D 21/06 (2006.01) F25D 29/00 (2006.01)
Patent
CA 2090456
A method and appara- tus to refrigerate air in a com- partment wherein liquid CO2 is delivered through a first primary heat exchanger (201) such that sufficient heat is ab- sorbed to evaporate the liquid carbon dioxide to form pres- surized vapor. The pressur- ized vapor is heated in a gas fired heater (207) to prevent solidification of the pressur- ized carbon dioxide when it is depressurized to provide is- entropic expansion of the va- por through pneumatically driven fan motors (294, 295) into a secondary hoot ex- changer (250). Orifices (294b, 295b) in inlets to the fan mo- tors and solenoid valves (222, 224) in flow lines to the fan motors keep the vapor pres- surized while the heater sup- plies sufficient heat to pre- vent solidification when the CO2 vapor expands through the motors. CO2 vapor is routed from the second heat exchanger to chill surfaces in a dehumidifier to condense moisture from a stream of air before it flows to the heat exchangers.
General Cryogenics Incorporated
Riches Mckenzie & Herbert Llp
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