| 摘要 |
<p>A refrigerant circuit R includes, a compressor 25 for compressing a refrigerant to a pressure higher than the critical pressure, a gas cooler 26, a motor-operated expansion valve 27, and an evaporator 28, and uses as a refrigerant a natural system refrigerant. A receiver 43 is provided to the high-pressure side of the refrigerant circuit R. There is provided an adjusting valve 44 for adjusting the refrigerant amount flowing through the inside of the receiver 43. A controller 55 adjusts the opening of the adjusting valve 44 so as to bring the temperature of the receiver 43 close to a target receiver temperature.</p> |
