| 摘要 |
PROBLEM TO BE SOLVED: To provide an air-conditioner capable of preventing frost formation without degrading the heating efficiency, and preventing liquid compression of refrigerant. SOLUTION: In the air-conditioner, when the temperature detected by a temperature detector 20 disposed on a refrigerant pipe at an inlet of an outdoor heat exchanger 5 is dropped, and becomes higher than the defrosting start temperature of the outdoor heat exchanger, a control valve 9 provided on a refrigerant pipe 19 is opened to allow high-temperature and high-pressure refrigerant discharged from a compressor 1 to flow into a water heat exchanger 7, and the refrigerant which flows from an indoor heat exchanger 3 and flows into a decompression means 4 is heated to raise the temperature of the refrigerant flowing into the outdoor heat exchanger. Frost formation on the outdoor heat exchanger is prevented thereby, and constantly efficient heating operation can be maintained. COPYRIGHT: (C)2004,JPO&NCIPI |
