| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the occurrence of liquid compression in a compressor having a variable operating frequency by accurately controlling the wetness of refrigerant attracted into the compressor.SOLUTION: A discharge temperature sensor 64 detects a discharge temperature of refrigerant discharged from a compressor 31. An outdoor heat exchanger temperature sensor 65 and an indoor heat exchanger temperature sensor 75 detect an evaporation temperature TE of the refrigerant and a condensation temperature TC of the refrigerant. A control device 50 acquires a target discharge temperature of the compressor 31 at which an attraction wetness of the compressor 31 is kept to a preset target wetness by performing a computation with at least one of the number of revolutions of the compressor 31 and a refrigerant circulation amount of a refrigeration circuit 20, the evaporation temperature TE, and the condensation temperature TC used as parameters, and controls an expansion mechanism 34 so that the discharge temperature is equal to a target discharge temperature TTd.</p> |
