Refrigeration – Automatic control – Refrigeration producer
Patent
1993-02-12
1994-05-24
Tanner, Harry B.
Refrigeration
Automatic control
Refrigeration producer
62 503, 62 511, 62 504, 62275, F25B 4104
Patent
active
053137876
ABSTRACT:
A method and apparatus to refrigerate air in a compartment wherein liquid CO.sub.2 is delivered through a first primary heat exchanger such that sufficient heat is absorbed to evaporate the liquid carbon dioxide to form pressurized vapor. The pressurized vapor is heated in a gas fired heater to prevent solidification of the pressurized carbon dioxide when it is depressurized to provide isentropic expansion of the vapor through pneumatically driven fan motors into a secondary heat exchanger. Orifices in inlets to the fan motors and solenoid valves in flow lines to the fan motors keep the vapor pressurized while the heater supplies sufficient heat to prevent solidification when the CO.sub.2 vapor expands through the motors. CO.sub.2 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.
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General Cryogenics Incorporated
Tanner Harry B.
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