To provide a refrigeration cycle device and its control method capable of sufficiently securing the reliability of an expansion device and recovering the energy in expansion, and remarkably improving the coefficient of performance.
This refrigeration cycle device uses a carbon dioxide gas as a refrigerant, and is constituted by successively connecting a compressor for compressing the refrigerant, a radiator for cooling the refrigerant pressurized by the compressor, an expander positioned at a downstream side with respect to the radiator, and taking out the motive energy by depressurizing and expanding the cooled refrigerant, and an ejector mounted at a downstream side of the expander, by means of pipes. A gas-liquid separator is mounted between the ejector and the compressor, a gas-side of the gas-liquid separator and a suction-side of the compressor are connected, a liquid-side of the gas-liquid separator is connected to the evaporator through a restriction device, and an outlet of the evaporator is connected to a suction port of the ejector.
SHIN MASAHIRO
Tomoyasu Sakaguchi
Hiroki Naito
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