| 摘要 |
PROBLEM TO BE SOLVED: To improve the quick heating property and heating performance without providing a liquid tank in a freezing cycle by providing an accumulator between an inner heat exchanger and a compressor, and selectively switching a first and a second flow switching valves between opening and closing. SOLUTION: In the case of immediately after starting an engine, a four-way valve 6 is set so that a discharge side of a compressor 2 and a bypass circuit B are connected to each other and that it forms a return circuit R with a pipeline, which is connected to an intake side of the compressor 2 and an outer heat exchanger 3, and an auxiliary inner heat exchanger Eb is turned on so as to open a first flow switching valve 5a, and a second flow switching valve 5b is throttled. When the compressor 2 is operated in this condition, the coolant at a high temperature and high pressure is flowed from the bypass circuit B to the first flow switching valve 5a, and the coolant in the high temperature and high pressure condition, which has bypassed the outer heat exchanger 3 having a large capacity, is flowed into the auxiliary inner heat exchanger Ea. With this structure, the air passing through the auxiliary heat exchanger Ea is heated so as to improve the quick heating property. |
