Defrost controller

Details Defrost controller Defrost controller

1993-12-13

1995-03-14

Tanner, Harry B.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

F25D 2106

Patent

active

053967771

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.

REFERENCES:
patent: 2847190 (1958-08-01), Slattery et al.
patent: 3010288 (1961-11-01), Jacobs
patent: 3023589 (1962-03-01), Jacobs
patent: 3309887 (1967-03-01), Jacobus
patent: 3309888 (1967-03-01), Jacobs
patent: 3495416 (1970-02-01), Morrissey, Jr. et al.
patent: 4045972 (1977-09-01), Tyree, Jr.

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