Refrigeration cycle device

A refrigeration cycle device comprising:

• a main refrigerant circuit having
• a main compressor that compresses a main refrigerant,
• a main heat-source-side heat exchanger that functions as a radiator of the main refrigerant,
• a main use-side heat exchanger that functions as an evaporator of the main refrigerant,
• a main expansion mechanism including an expansion element of a rotary or scroll type that causes power to be produced by decompressing the main refrigerant that flows between the main heat-source-side heat exchanger and the main use-side heat exchanger, and
• a main intermediate-pressure adjusting valve between the main expansion mechanism and the main use-side heat exchanger,
• wherein the main refrigerant circuit has a sub-use-side heat exchanger that functions as a cooler of the main refrigerant that flows between the main expansion mechanism and the main use-side heat exchanger;
• the refrigeration cycle device further comprising:
• a sub-refrigerant circuit having
• a sub-compressor that compresses a sub-refrigerant,
• a sub-heat-source-side heat exchanger that functions as a radiator of the sub-refrigerant, and
• the sub-use-side heat exchanger that functions as an evaporator of the sub-refrigerant and that cools the main refrigerant that flows between the main expansion mechanism and the main use-side heat exchanger;
• and
• the refrigeration cycle device further comprising:
• a controller that controls the main intermediate-pressure adjusting valve,
• wherein the controller controls an opening degree of the main intermediate-pressure adjusting valve inversely to the outside air temperature such that as the outside air temperature rises, the main intermediate-pressure adjusting valve is further closed, and as the outside air temperature falls, the main intermediate-pressure adjusting valve is further opened.