| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To accurately determine the propriety of a refrigerant amount. <P>SOLUTION: A refrigerant circuit 10 has a compressor 21, an outdoor heat exchanger 23, an outdoor expansion valve 24, an indoor heat exchanger 41 and a four-way switch valve 22. A calculating means calculates a supercooling degree of a refrigerant at an outlet of the outdoor heat exchanger 23 in a cooling operation or the indoor heat exchanger 41 in a heating operation, or calculates a physical quantity corresponding to the supercooling degree, and/or calculates an operating state quantity variable according to variation of the supercooling degree or the physical quantity corresponding to the supercooling degree, as a supercooling degree correlation value. A correcting means corrects a second supercooling degree correlation value on the basis of a circulation amount of the refrigerant and a heat passage rate of the outdoor heat exchanger 23 in the cooling operation or the indoor heat exchanger 41 in the heating operation, and derives the second supercooling degree correlation value after the correction. A refrigerant amount propriety determining means determines the propriety of the refrigerant amount in the refrigerant circuit 10 at a second time point on the basis of the comparison of the first supercooling degree correlation value with the second supercooling degree correlation value after the correction. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
