F - Mech Eng,Light,Heat,Weapons – 25 – B
Patent
F - Mech Eng,Light,Heat,Weapons
25
B
F25B 47/02 (2006.01)
Patent
CA 2053297
A hot gas defrost refrigeration sys- tem has a compressor, a condenser, and an evaporator, interconnected by fluid passage means and incorporating valve means to cause refrigerant to flow se- quentially through the compressor, con- denser, and evaporator to the compressor during the refrigeration cycle. Refriger- ant flow during the defrost cycle is from compressor to evaporator through the condenser to the compressor. The refri- geration system includes defrost passage means, including valve means, connect- ing the evaporator outlet to the condenser inlet and connecting the condenser outlet to the compressor inlet. A vessel is pro- vided which combines the functions of receiver during refrigeration and super- heater during defrost. During refrigera- tion liquid refrigerant flows from the condenser through the superheater/re- ceiver to the evaporator. During defrost, the defrost passage means directs vapo- rous 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 com- pressor discharge refrigerant to compressor suction refrigerant during the defrost cycle. The condenser is utilized as a reevapora- tor during defrost and the superheater/receiver exchanges heat between compressor inlet and suction refrigerant to enhance sys- tem operation during the defrost cycle.
Heatcraft Inc.
Smart & Biggar
LandOfFree
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