| 摘要 |
PROBLEM TO BE SOLVED: To provide a binary refrigerating device capable of improving operation efficiency.SOLUTION: This binary refrigerating device includes a high order refrigerating cycle 20 configured by connecting a high order-side compressor 21, a high order-side condenser 22, a high order-side expansion valve 23, a high order-side evaporator 24 and a high order-side heat storage evaporator 25 by piping to circulate a refrigerant, a low order-side refrigerating cycle 10 configured by connecting a low order-side compressor 11, a low order-side condenser 12, a low order-side heat storage condenser 14, a low order-side expansion valve 15, and a low order-side evaporator 16 by piping to circulate the refrigerant, a cascade condenser 30 composed of a first evaporator and a second condenser to exchange heat between the refrigerant flowing in the first evaporator and the refrigerant flowing in the second condenser, and a heat storage tank 31 receiving the high order-side heat storage evaporator 25 and the low order-side heat storage condenser 14, storing cold heat by cooling a heat storage medium 32 by the high order-side heat storage evaporator 25, and cooling the low order-side heat storage condenser 14 by the cold heat stored in the heat storage medium 32. |
