HEAT PUMP SYSTEM FOR VEHICLE

摘要

The present invention relates to a heat pump system for a vehicle. Specifically, the heat pump system for a vehicle includes a chiller heat-exchanging cooling water circulating in a vehicle electronic unit (200), a refrigerant flowing in a first bypass line (R1) by being discharged from an outer heat exchanger, and the refrigerant discharged from an inner heat exchanger. The refrigerant discharged from the inner heat exchanger is firstly cooled by the chiller in an air conditioning mode and secondarily cooled by the outer heat exchanger. Therefore, sub cool is increased, and heat pump system for a vehicle increases a refrigerant flow rate and improves cooling efficiency. The refrigerant discharged from the inner heat exchanger obtains the sub cool in the chiller in a heat pump mode and increases the refrigerant flow rate. The refrigerant discharged from the outer heat exchanger can improve heating performance by receiving an additional heat source from the chiller. Also, the heat pump system for a vehicle can obtain the additional heat source in the chiller in a defrosting mode due to the installation of the outer heat exchanger and can minimize the change of an inner discharge temperature due to a lack of the heat source.