A heat pump system for a vehicle is configured to perform cooling or heating of the vehicle interior by using a natural refrigerant, and efficiently adjust the temperature of the battery module by using a single chiller that heat-exchanges refrigerant and coolant.

Proposed are an air conditioner having an integrated heat exchanger and an air conditioning system using the integrated heat exchanger. The integrated heat exchanger enables heat exchange between cooling water and conditioning-air, and generates heating air or cooling air such that cooling/heating efficiency is improved. Further, since the temperature of the cooling water circulating in the integrated heat exchanger is adjusted, there is no temperature adjustment door for adjusting the temperature of conditioning-air, so the number of parts is reduced. Further, since the integrated heat exchanger is applied, components are optimally arranged and the entire package is reduced in size.

A thermal management system configured for use on a vehicle, the thermal management system including a first temperature regulation circuit, a second temperature regulation circuit, and a controller configured to operate the first temperature regulation circuit and the second regulation circuit, wherein the first temperature regulation circuit is configured to circulate a fluid through a plurality of heat exchangers, an energy storage system, and an electric power unit, the second temperature regulation circuit is configured to circulate a fluid through a plurality of heat exchangers and a compressor, and the controller is configured to convert one or more of the first temperature regulation circuit to a first temperature regulation sub-circuit and the second temperature regulation circuit to a second temperature regulation sub-circuit to direct the flow of one or more of the fluids through one or more of the first temperature regulation circuit and the second temperature regulation circuit.