HEAT PUMP SYSTEM FOR VEHICLE

摘要

The present invention relates to a heat pump system for a vehicle. The heat pump system includes a refrigerant-coolant heat exchanger for exchanging heat between refrigerant circulating through a refrigerant circulation line and coolant circulating through electronic units of the vehicle. The heat pump system can operate the heat pump mode even though outdoor air temperature is zero or lower or frosting is formed on the external heat exchanger because waste heat of the electronic units is retrieved through the refrigerant-coolant heat exchanger, thereby further enhancing heating performance and efficiency.

主权项

1. A heat pump system for a vehicle which comprises:
a compressor mounted on a refrigerant circulation line (R) for compressing and discharging refrigerant; an internal heat exchanger mounted inside an air-conditioning case for exchanging heat between the air inside the air-conditioning case and the refrigerant discharged from the compressor; an evaporator mounted inside the air-conditioning case for exchanging heat between the air inside the air-conditioning case and the refrigerant supplied to the compressor; an external heat exchanger mounted outside the air-conditioning case for exchanging heat between the refrigerant circulating through the refrigerant circulation line (R) and the outdoor air; first expansion means mounted on the refrigerant circulation line located at an outlet of the internal heat exchanger to selectively expand refrigerant discharged from the internal heat exchanger; and second expansion means mounted on the refrigerant circulation line located at an inlet of the evaporator to expand the refrigerant supplied to the evaporator, further comprising: a coolant circulation line (W) configured to circulate coolant toward electronic units of the vehicle to cool the electronic units; and a refrigerant-coolant heat exchanger configured to exchange heat between the refrigerant circulating through the refrigerant circulation line (R) and coolant circulating through the coolant circulation line (W), wherein the refrigerant circulating through the refrigerant circulation line (R) radiates heat to the coolant and the outdoor air through the refrigerant-coolant heat exchanger and the external heat exchanger in an air-conditioning mode, and wherein the refrigerant circulating through the refrigerant circulation line (R) absorbs heat from the coolant and the outdoor air through the external heat exchanger and the refrigerant-coolant heat exchanger in a heat pump mode.