Heat pump system having a defrost mechanism for low ambient...

Details Heat pump system having a defrost mechanism for low ambient... Heat pump system having a defrost mechanism for low ambient...

F - Mech Eng,Light,Heat,Weapons

25

B

F25B 30/02 (2006.01) F25B 47/02 (2006.01) F25B 49/02 (2006.01)

Patent

CA 2561123

A heat pump system includes a hot gas bypass defrost mechanism which enables normal heat pump operation at low ambient air temperatures, and may be used for heating swimming pools. The bypass defrost mechanism is activated by sensing a drop in compressor suction line pressure, which occurs at low ambient temperatures when frost forms on an evaporator in the heat pump, which disrupts normal heat pump operation. The defrost mechanism includes a circuit that redirects a portion of hot refrigerant discharged by a compressor directly to the evaporator, thereby bypassing other heat pump components and defrosting the evaporator.

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