Heatcraft Inc.

Bohn, Inc.

Paul F Lammert

A hot gas defrost refrigeration system has a compressor, a condenser, a receiver, an evaporator, interconnected by fluid passage means and incorporating valve means to cause refrigerant to flow sequentially through the compressor, condenser, receiver and evaporator to the compressor during the refrigeration cycle. The refrigeration system includes a superheater and defrost passage means, including valve means, connecting the evaporator outlet to the condenser inlet and connecting the condenser outlet through the superheater to the compressor inlet, bypassing the receiver. The passage means connecting the compressor outlet with the evaporator inlet includes a superheat passage in heat exchange relationship with the superheater for transferring heat from the refrigerant discharged from the compressor outlet to the refrigerant delivered to the compressor inlet during the defrost cycle. During the defrost cycle, refrigerant flows sequentially from the compressor to the evaporator, then through the defrost passage means to the condenser and then to the superheater to the compressor. The condenser is utilized as a reevaporator during defrost and the superheater exchanges heat between compressor inlet and suction refrigerant to enhance system operation during the defrost cycle.

Hot gas defrost refrigeration system

A hot gas defrost refrigeration system has a compressor, a condenser, and an evaporator, interconnected by fluid passage means and incorporating valve means to cause refrigerant to flow sequentially through the compressor, condenser, and evaporator to the compressor during the refrigeration cycle. Refrigerant flow during the defrost cycle is from compressor to evaporator through the condenser to the compressor. The refrigeration system includes defrost passage means, including valve means, connecting the evaporator outlet to the condenser inlet and connecting the condenser outlet to the compressor inlet. A vessel is provided which combines the functions of receiver during refrigeration and superheater during defrost. During refrigeration liquid refrigerant flows from the condenser through the superheater/receiver to the evaporator. During defrost, the defrost passage means directs vaporous refrigerant from the evaporator through the superheater/receiver to the compressor. The compressor discharge passage to the evaporator includes a superheat passage in heat exchange relationship with the superheater for transferring heat from compressor discharge refrigerant to compressor suction refrigerant during the defrost cycle. The condenser is utilized as a reevaporator during defrost and the superheater/receiver exchanges heat between compressor inlet and suction refrigerant to enhance system operation during the defrost cycle.

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Danville, IL, United States of America

Paul F Lammert