| 摘要 |
A refrigeration defrost system including at least one frosted evaporator having an evaporator refrigerant vapor line and an evaporator refrigerant liquid line, comprises a first compressor having a suction inlet line and a discharge outlet line each connected to a discharge manifold, the discharge outlet being connected to said evaporator refrigerant vapor line. A first pressure regulator valve disposed in a refrigerant bypass passageway between the discharge manifold and the suction inlet line, feeds refrigerant vapor, when a defrost cycle is required, from the discharge manifold into the suction inlet line. The refrigerant vapor is fed from the first compressor into the discharge outlet line and into the frosted evaporator through the evaporator refrigerant vapor lin e, thereby defrosting said frosted evaporator. Also disclosed is a method of defrosting a frosted evaporator using a single, dedicated defrost compressor .
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