HEAT PUMP SYSTEM FOR VEHICLE

A heat pump system for a vehicle, being capable of heating the indoor space under a low-temperature environment without driving an engine, improving fuel efficiency, reducing the emission of carbon dioxide, and moreover, improving comfortability for passengers is disclosed. The heat pump system includes: a refrigerant line which cools down or heats the indoor space of the vehicle by circulating a refrigerant discharged from a compressor; a first coolant line which circulates through a heater core arranged in an engine and an air-conditioning case; and a second coolant line which circulates through electric components and an electric component radiator. In addition, a chiller which thermally exchanges electronic heat from the second coolant line with a refrigerant is provided, and an intermediate heat exchanger which thermally exchanges heat with an expanded refrigerant in an upstream refrigerant line of the chiller and cools down the refrigerant passing therethrough is provided.