| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To minimize heat loss in a refrigerant-fluid heat exchanger for exchanging heat between a primary side refrigerating cycle and a secondary side liquid fluid cycle. <P>SOLUTION: This air conditioner 10 heats and cools a room by heat exchange between: the refrigerating cycle 20 provided with successively connecting a compressor 21, a four-way valve 22, an outdoor side heat exchanger 23, an expansion device 25 and a refrigerant-fluid heat exchanger 40, and using hydrocarbons refrigerant as a refrigerant; and the liquid fluid cycle 30 constituted by successively connecting a liquid pump 11, the refrigerant-fluid heat exchanger 40, and an indoor side heat exchanger 32 by the refrigerant-fluid heat exchanger 40. The air conditioner is further provided with: an internal heat exchanger 24 exchanging heat between a suction side of the compressor 21 and an intermediate part between the outdoor side heat exchanger 23 and the expansion device 25; and a control portion 50 performing the control so that the refrigerant of the refrigerating cycle is not in a superheated state in the refrigerant-fluid heat exchanger 40 and is in a superheated state in the internal heat exchanger 24 in a cooling operation. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
