F - Mech Eng,Light,Heat,Weapons – 25 – D
Patent
F - Mech Eng,Light,Heat,Weapons
25
D
62/34
F25D 11/02 (2006.01) F25B 5/02 (2006.01) F25B 47/02 (2006.01) F25D 21/12 (2006.01)
Patent
CA 1073230
METHOD AND APPARATUS FOR DEFROSTING A REFRIGERATION SYSTEM ABSTRACT OF THE DISCLOSURE To defrost a selected evaporator, in a system includ- ing at least two evaporators, the system condenser is isolated from the compressor and the selected evaporator receives hot, compressed refrigerant vapor directly from the compressor. The liquid refrigerant formed in the de- frosting evaporator flows to the other evaporators in the system to permit them to continue in the refrigeration mode. A pressure regulated control system is provided which causes excess liquid refrigerant in the defrosted evaporator to be pumped out of that evaporator before the evaporator is reconnected to the compressor suction line. In a preferred embodiment, each evaporator includes a coil having a plurality of circuits connected between its inlet and outlet and each circuit is disposed in a horizontal plane at a different elevation from any of the other circuits. During the defrost cycle, hot compressed refrigerant vapor flows through either the normal inlet or outlet of the evaporator after passing through a hot gas inlet line which is arranged to pre-heat the lowermost circuits of the evaporator, thereby equalizing the defrost- ing rate of circuits located at different elevations.
304251
Datta Chander
Lindahl Herbert S.
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