HEAT PUMP SYSTEM WITH HOT WATER DEVICE

摘要

Invention: HEAT PUMP SYSTEM WITH HOT WATER DEFROST of the Invention An integrated heat pump and hot water system including a water to refrigerant heat exchanger having a refrigerant evaporating circuit and a refrigerant condensing circuit that are in heat transfer relation with the water circuit. A bi-flow expansion valve with a positive shut off feature is mounted in the refrigerant liquid line connecting the indoor and outdoor coil of the heat pump. The refrigerant evaporator circuit is connected between the inlet of the compressor and the liquid line by an evaporator line that enters the liquid line between the biflow expansion valve and the outdoor coil. A solenoid actuated metering valve is placed in the evaporator line to control the flow of refrigerant passing through the evaporator circuit. The condensing circuit of the heat exchanger is connected directly to the discharge line of the compressor so that the refrigerant discharged from the compressor passes through the condensing circuit. By simply cycling the expansion valve and the metering valve a number of operational modes may be selected whether or not the heat pump is conditioning comfort zone air.