REFRIGERATION DEVICE

摘要

A refrigeration apparatus includes a high-temperature side circulation circuit A and a low-temperature side circulation circuit B. The high-temperature side circulation circuit A is configured by connecting a high-temperature side compressor 1, a high-temperature side condenser 2, a high-temperature side expansion valve 3, and a high-temperature side evaporator 4 of a cascade heat exchanger 14 to one another. The low-temperature side circulation circuit B is configured by connecting a low-temperature side compressor 5, a low-temperature side condenser 6 of the cascade heat exchanger 14, a receiver 7 that stores a liquid refrigerant, a solenoid valve 8, a low-temperature side expansion valve 9, and a low-temperature side evaporator 10 to one another. A refrigerant in the low-temperature side circulation circuit B includes a zeotropic refrigerant mixture containing at least CO 2 and R32. The content of R32 in the entire zeotropic refrigerant mixture is 50% to 74% by mass, and the GWP of the zeotropic refrigerant mixture is equal to or less than 500.