Heat pump type air conditioner for vehicle

摘要

A heat pump type air conditioner for a vehicle has a refrigeration cycle constituted by a compressor (2), an external heat exchanger (3), a refrigerant valve unit (5) and an internal heat exchanger unit (E). The refrigerant valve unit includes first (5a) and second (5b) flow control valves, and the internal heat exchanger unit includes an auxiliary internal heat exchanger (Ea) and a main internal heat exchanger (Eb). In the refrigeration cycle, the first flow control valve, the auxiliary internal heat exchanger, the second flow control valve and the main internal heat exchanger are serially connected in the order of mention. The main and auxiliary internal heat exchangers change their function between an evaporator and a condenser according to the controlled state of the first and second flow control valve.