Patent ID: 6889512

Claim:
An on-vehicle air-conditioner comprising: a refrigeration circuit having a two-stage compression system compressor for cooling a refrigerant compressed in the first stage by a refrigerant heat exchanger and compressing further the chilled refrigerant in the second stage before discharging, and an evaporator installed in a way to exchange heat with the car interior air, a cooling water circuit provided with a cooling water car interior heat exchanger for heating, where the engine cooling water circulates, installed in a way to exchange heat with the car interior air, and a damper apparatus for controlling an air course of whether or not passing the car interior air through said evaporator and/or cooling water car interior heat exchanger for heating, wherein: said refrigerant heat exchanger is installed in a way to exchange heat with the car interior air, allowing to use for heating car interior air together with said cooling water car interior heat exchanger for heating.