Heat pump system for a vehicle

A heat pump system for a vehicle, the heat pump system comprising:

• a compressor configured to compress a refrigerant;
• a Heating, Ventilation, and Air Conditioning (HVAC) module including a heater core and an evaporator connected to the compressor through a refrigerant line, and including a door configured to open and close to adjust an air having passed through the evaporator to be selectively introduced into the heater core when cooling or heating a vehicle interior;
• a condenser connected to the compressor through the refrigerant line, the condenser configured to condense the refrigerant;
• a sub-condenser connected to the condenser through the refrigerant line, the sub-condenser configured to selectively condense the refrigerant discharged from the condenser;
• a first expansion valve disposed between and connected to the sub-condenser and the evaporator through the refrigerant line;
• a refrigerant connection line including a first end connected to the refrigerant line between the sub-condenser and the first expansion valve, and a second end connected to the refrigerant line between the evaporator and the compressor;
• a chiller provided on the refrigerant connection line;
• a first cooling apparatus connected to the condenser through a first coolant line, wherein the first cooling apparatus includes a first radiator, an electrical component, and a first water pump provided on the first coolant line to allow a first coolant to flow along the first coolant line;
• and
• a second cooling apparatus connected to the sub-condenser through a second coolant line, wherein the second cooling apparatus includes a second radiator and a second water pump provided on the second coolant line to allow a second coolant to flow along the second coolant line.