| 摘要 |
PROBLEM TO BE SOLVED: To prevent reverse heat exchange in an internal heat exchanger and secure desired cooling ability of an evaporator by connecting a bypass passage bypassing the internal heat exchanger and providing the bypass passage with flow rate adjustment means to increase an opening according to lowering degree of cooling ability of the evaporator. SOLUTION: In this air conditioner, refrigerant delivered by a compressor 1 is circulated through a gas cooler 2, internal heat exchanger 3, throttle portion 4 and evaporator 5. Bypass pipes 6 are connected with the internal heat exchanger 3 in parallel and a flow rate adjustment valve 7 is provided therein. The bypass pipes 6 are composed of an inner pipe for high-pressure refrigerant and an outer pipe for low-pressure refrigerant. Heat exchange is performed while the refrigerant is passing through the both passages. According to lowering degree of pressure detected by a first pressure sensor 9, an opening of the flow rate adjustment valve 7 is gradually increased. Accordingly, reverse heat exchange between refrigerants in the internal heat exchanger 3 is prevented, and cooling ability of the evaporator 5 can be delivered appropriately.
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