HEAT PUMP SYSTEM

摘要

A heater core for exchanging heat between a coolant and ventilation air to be blown into a vehicle interior is disposed in a high-pressure side heat-medium circulation circuit that allows for circulation of the coolant heated by a heat pump cycle. A radiator for exchanging heat between at least a part of the coolant flowing out of the heater core and a low-pressure refrigerant in the heat pump cycle is disposed in a low-pressure side heat-medium circulation circuit coupled to the high-pressure side heat-medium circulation circuit. Thus, excessive heat included in the coolant flowing out of the heater core and which is not used to heat the ventilation air can suppress frost formation on an exterior heat exchanger and can also defrost the exterior heat exchanger.

主权项

1. A heat pump system comprising:
a heat pump cycle including a compressor adapted to compress and discharge a refrigerant, a heat medium-refrigerant heat exchanger that exchanges heat between a high-pressure refrigerant discharged from the compressor and a heat medium, a decompression device that decompresses the refrigerant flowing out of the heat medium-refrigerant heat exchanger, and an exterior heat exchanger that exchanges heat between the refrigerant decompressed by the decompression device and outside air; a heat-medium circulation circuit in which the heat medium circulates, the heat-medium circulation circuit being provided with a heating heat exchanger that exchanges heat between a heating target fluid and the heat medium flowing out of the heat medium-refrigerant heat exchanger to heat the heating target fluid; a heat-medium radiation portion that dissipates heat included in the heat medium flowing out of the heating heat exchanger, to a low-pressure refrigerant circulating through a range leading from an outlet side of the decompression device to a suction port of the compressor; a heat-medium flow-rate adjustment device that adjusts a flow rate of the heat medium flowing out of the heating heat exchanger into the heat-medium radiation heat exchanger; and a heat-medium flow-rate control portion that controls an operation of the heat-medium flow-rate adjustment device, wherein the heat-medium flow-rate control portion controls the operation of the heat-medium flow-rate adjustment device based on a heating capacity for the heating target fluid that is required for the heat pump cycle.