Experimental investigation of hot gas defrosting system for domestic refrigerator
Shrikant Kathwate, Uday Wankhede, Mohnesh Mandhre
In vapor compression refrigeration system, during the defrosting process there was interruption of cooling in compressor shutdown method, electric heater defrosting, reverse cycle defrosting method etc. The hot gas bypass method is developed to remove the frost from evaporator coils and to provide continuous cooling without any interruption. The experimentation was carried out with two evaporator chambers in domestic refrigerator. At the time of defrosting of one evaporating chamber, another chamber provides continuous cooling. Based on the test results the effects of hot gas bypass cycle were studied. In addition the operating characteristics of hot gas defrosting cycle were compared with those of simple VCRS cycle. The experimental study analyzes the possibilities of minimum hot gas bypass for defrosting so that COP obtained during defrosting was nearly equal to COP obtained during simple VCRS cycle.