Patent ID: 6266968
Filing Date: 2001-07-31
Classification: F25B,Y02B

Abstract:
In a vapor compression refrigeration system that includes,a compressor with a suction inlet and a discharge outlet, the compressor powered by a compressor motor,a condenser having an inlet and an outlet, the condenser inlet receiving compressed refrigerant vapor from the discharge outlet of the compressor,the following combination is claimed,a) two or more thermally insulated chambers, the chambers designated here by CHn, where n herein is an index number suffix in the range n=1,2,3------N, N.gtoreq.2, CHn containing an evaporator designated here by EVAPn, EVAPn equipped with an electrically driven fan designated here by Fn which, when energized, moves air over the surface of EVAPn to enhance heat transfer from EVAPn, the outlet of EVAPn connected by a refrigerant passage to the inlet of EVAP(n+1) for n<N. the outlet of EVAPN connected by a refrigerant passage to the suction inlet of the compressor,b) an expansion valve with an inlet connected by a refrigerant passage to the condenser outlet and an outlet connected by a refrigerant passage to the inlet of EVAP1,b) an expansion valve control, responsive to the difference in temperature between the outlet of EVAPN and the inlet of EVAP1, the expansion valve control causing the expansion valve to respectively increase or decrease refrigerant flow if said difference in temperature exceeds or is below a preset temperature difference.