Refrigeration – Processes – Defrosting or frost inhibiting
Patent
1990-07-30
1991-11-19
Makay, Albert J.
Refrigeration
Processes
Defrosting or frost inhibiting
621964, 62151, F25B 4100
Patent
active
050655841
ABSTRACT:
A refrigeration system including a compressor, condenser, capillary tube and evaporator includes a hot gas bypass defrosting capability provided by a bypass means around the capillary tube. Defrosting is achieved by the use of hot, uncondensed refrigerant, without requiring a reversal of the flow of refrigerant through the system. An exemplary bypass means includes a solenoid valve and associated tubing to form an alternate, low restriction path for the refrigerant to bypass the capillary tube. When the solenoid valve is closed, refrigerant is forced through the capillary tube for normal refrigeration. However, when the solenoid valve is open, condensation of refrigerant in the condenser is inhibited, and hot refrigerant gas is delivered directly to the evaporator for defrosting. The solenoid valve is controlled in response to the total accumulated running time of the compressor for improved control of the defrosting cycles.
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Byczynski Dean G.
Reed William A.
Doerrler William C.
Makay Albert J.
U-Line Corporation
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