Defrosting method and apparatus for a refrigeration system

Details Defrosting method and apparatus for a refrigeration system Defrosting method and apparatus for a refrigeration system

1993-05-24

1994-06-14

Tanner, Harry B.

Refrigeration

Processes

Defrosting or frost inhibiting

62151, 621964, 62278, F25D 2106

Patent

active

053199405

ABSTRACT:
Method and apparatus to defrost evaporator coils of a refrigeration system by periodically replacing the refrigerant in the evaporator coils by hot refrigerant gas from the compression side of a compressor. The gas from the compressor is sent through an oil separator, then through a solenoid valve to a vaporizer tank. From the vaporizer tank, a portion of the hot gas is fed constantly during the defrosting cycle through a metering flow control valve to the evaporator coils. As the pressure builds up in the vaporizer tank due to the compressor supplying more gas than the amount flowing through the metering flow control valve, a pressure control senses the pressure increase and opens a vaporizer solenoid valve to allow additional hot gas to flow to the evaporator coils. In the evaporator the gas heats the evaporator coils and melts the frost on the coils and then passes to the suction line of the compressor.

REFERENCES:
patent: 2693678 (1954-11-01), Toothman
patent: 2770104 (1956-11-01), Sweynor
patent: 4802339 (1989-02-01), Gregory
patent: 5197297 (1993-03-01), Brendel et al.

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