Patent ID: 7266959
Filing Date: 2007-09-11
Classification: F25B

Abstract:
1. An air-source heat pump comprising: a primary compressor having a primary compressor inlet and a primary compressor outlet; a booster compressor having a booster compressor inlet and a booster compressor outlet; a first heat exchanger; a second heat exchanger; an expansion device; a refrigerant fluid; a flow conduit means connecting the first and second heat exchangers, the primary and booster compressors, and the expansion device for circulating the refrigerant fluid in a closed loop, a first sensor means for sensing the temperature of internal ambient air; a second sensor means for sensing the temperature of external ambient air; a third sensor means for sensing the temperature of the refrigerant flowing between the booster compressor outlet and the primary compressor inlet; a fourth sensor means for sensing the operation of the primary compressor; a primary compressor operation control means responsive to inputs from the first sensor means, in connection with the primary compressor and in connection with the first sensor means, a booster compressor operation control means responsive to inputs from the second, third, and fourth sensor means, in connection with the booster compressor and in connection with the second, third, and fourth sensor means,