DEFROST HEAT MANAGEMENT SYSTEM IN A FORCED CIRCULATION COOLING CABINET

摘要

The invention relates to a unit (10) which can be used as freezer or refrigerator or combination refrigerator-freezer. The unit (10) comprises a freezer compartment (12) and an evaporator compartment (14) housed in a common housing (16). Both the compartments are connected by cool air vents (18) and warm air vents (20). The unit (10) has cool air flaps (30) for the cool air vents (18) and warm air flaps (32) for warm air vents (20). The unit (10) also has exhaust air vents (28) and an exhaust air flap (34). During cooling cycle, the exhaust air flap (34) is closed, cool air flap (30) and warm air flap (32) are opened to circulate cool air from evaporator to the freezer compartment (12). During a defrost cycle, all the flaps are closed and a heater (26) Is switched on to warm up the evaporator (22). During an exhaust cycle, the cool air flap (30) and warm air flap (32) are closed and the exhaust air flap (34) is open. The warm air trapped in the evaporator compartment (12) is sent out of the unit (10) before starting the cooling cycle, which results in increased efficiency with regard to the power consumed by the unit (10).