A heat pump system for a vehicle, the heat pump system comprising:
- a first cooling device including a first radiator and a first water pump connected through a first coolant line and circulating a coolant in the first coolant line to cool at least one electrical component and at least one motor mounted on the first coolant line;
- a second cooling device including a second radiator and a second water pump connected through a second coolant line and circulating the coolant in the second coolant line;
- a battery module mounted on a battery coolant line selectively connectable to the second coolant line through a first valve mounted between the battery coolant line and the second coolant line;
- and
- a chiller mounted on the battery coolant line and through which the coolant passes, connected to a refrigerant line of an air conditioning device through a refrigerant connection line connected to the refrigerant line, and making the coolant which selectively flows exchange heat with a refrigerant supplied from the air conditioning device to control a temperature of the coolant,
- wherein a main heat exchanger provided in the air conditioning device is connected to each of the first and second coolant lines so that the coolant circulated in the first and second cooling devices passes through the first and second cooling devices, respectively,
- wherein the refrigerant passing through the main heat exchanger exchanges heat with the coolant supplied through the first coolant line and exchanges heat with the coolant supplied through the second coolant line,
- wherein a flash tank separating the refrigerants which have exchanged heat into a gaseous refrigerant and a liquid refrigerant and selectively discharging is provided outside the main heat exchanger, and
- wherein the air conditioning device includes:
- an HVAC module connected through the refrigerant line and having a door for controlling outside air passing through an evaporator to selectively flow into an internal condenser according to cooling, heating, and dehumidifying modes of the vehicle;
- a compressor connected through the refrigerant line between the evaporator and the internal condenser;
- a first expansion valve mounted on the refrigerant line connecting the main heat exchanger and the evaporator;
- a second expansion valve mounted on the refrigerant connection line;
- a first bypass line connecting the flash tank and the compressor so that the gaseous refrigerant passing through the flash tank selectively flows into the compressor;
- a third expansion valve mounted on the refrigerant line between the internal condenser and the main heat exchanger;
- and
- a second bypass line connecting the refrigerant line between the main heat exchanger and the third expansion valve and the refrigerant line between the first expansion valve and the evaporator so that the refrigerant passing through the internal condenser selectively flows into the evaporator.