Refrigeration cycle device

A refrigeration cycle device capable of performing a room interior heating in which ventilation air to be blown into a space to be air conditioned is heated, a device cooling in which a heat generating device is cooled, and a room interior cooling in which the ventilation air is cooled, the refrigeration cycle device comprising:

• a compressor configured to compress and discharge a refrigerant containing oil;
• a refrigerant radiator configured to heat the ventilation air to be blown into the space to be air conditioned using the refrigerant discharged from the compressor as a heat source during the room interior heating;
• a refrigerant decompression valve configured to decompress the refrigerant having passed through the refrigerant radiator;
• a parallel decompression valve disposed in parallel with the refrigerant decompression valve on a downstream side of the refrigerant radiator in a refrigerant flow;
• a heat exchanger disposed to exchange heat between the refrigerant decompressed in the refrigerant decompression valve and a thermal medium of a thermal medium circuit, the heat exchanger being configured to cool the heat generating device via the thermal medium by using latent heat of evaporation of the refrigerant decompressed in the refrigerant decompression valve during the device cooling, and to function as a heat absorber during the room interior heating;
• an air-conditioning cooler configured to cool the ventilation air using the latent heat of evaporation of the refrigerant decompressed in the parallel decompression valve;
• and
• a controller configured to control a throttle opening degree of the refrigerant decompression valve and a throttle opening degree of the parallel decompression valve, wherein
• the controller is configured to perform, at least during the room interior heating, a fluctuation operation in which the throttle opening degree of the refrigerant decompression valve is changed and a refrigerant state on a refrigerant outlet side of the device cooler heat exchanger is alternately changed to a superheated state having a superheat degree and a wet state containing wet vapor.

A refrigeration cycle device capable of performing a room interior heating in which ventilation air to be blown into a space to be air conditioned is heated, the refrigeration cycle device comprising:

• a compressor configured to compress and discharge a refrigerant containing oil;
• a refrigerant radiator configured to heat the ventilation air using the refrigerant discharged from the compressor as a heat source during the room interior heating;
• a refrigerant decompression valve configured to decompress the refrigerant having passed through the refrigerant radiator;
• an evaporator configured to evaporate the refrigerant and to function as a heat absorber during the room interior heating;
• and
• a controller configured to control a throttle opening degree of the refrigerant decompression valve, wherein
• the controller is configured to perform, at least during the room interior heating, a fluctuation operation in which the throttle opening degree of the refrigerant decompression valve is changed and a refrigerant state on a refrigerant outlet side of the evaporator is alternately changed to a superheated state having a superheat degree and a wet state containing wet vapor.