| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a refrigeration device using R32 as refrigerant, and capable of improving the COP of the refrigeration device if a compressor operates in a small number-of-revolutions range and the pressure difference is large between the high pressure side and the low pressure side of the compressor.SOLUTION: An air conditioner 10 using R32 as refrigerant includes: a compressor 31; an outdoor heat exchanger; expansion valves 23 and 36; an indoor heat exchanger; a determination unit 41a; and a lower-limit change unit 41c. The compressor attracts low-pressure refrigerant from a suction tube, compresses the refrigerant, and discharges high-pressure refrigerant. The determination unit determines whether the compressor is in a differential pressure state, that is, whether a pressure difference between a pressure of the high-pressure refrigerant discharged from the compressor and that of the low-pressure refrigerant attracted by the compressor is equal to or larger than a predetermined value. The lower-limit change unit changes a lower-limit number of revolutions of the compressor from a first lower limit to a second lower limit greater than the first lower limit if the determination unit determines that the compressor is in the differential pressure state.</p> |
