Patent ID: 7043928
Filing Date: 2006-05-16
Classification: B60H,F25B

Abstract:
1. A refrigeration cycle system comprising means for switching between: a cooling mode in which a refrigerant discharged from a compressor is returned to said compressor through a second heat exchanger, a cooling pressure reduction unit and a first heat exchanger thereby to operate said first heat exchanger as an evaporator; and a heating mode with a hot gas heater cycle (H) in which the refrigerant discharged from said compressor bypasses said second heat exchanger and is returned through said first heat exchanger to said compressor thereby to operate said first heat exchanger as a heat radiator; wherein upon generation of a start signal for said hot gas heater cycle (H), said cooling mode is started first thereby to start the recovery of the refrigerant dormant in said second heat exchanger, and after execution of said dormant refrigerant recovery, said heating mode with said hot gas heater cycle (H) is executed; wherein said compressor is a variable displacement type refrigerant compressor having a variable displacement mechanism for changing the discharge capacity utilizing the difference between the discharge pressure and the suction pressure; and wherein after starting the dormant refrigerant recovery in said cooling mode, the timing of ending said cooling mode is determined based on an information value correlated with the discharge pressure of said compressor.