| 摘要 |
PROBLEM TO BE SOLVED: To suppress degradation of heating performance due to deterioration of start-up by suppressing loss in starting up a refrigerating cycle in a binary refrigeration device.SOLUTION: In a binary refrigeration device, a low order-side refrigerating cycle configured by connecting a low order-side compressor, a cascade heat exchanger, a low order-side expansion valve and a low order-side heat exchanger by low order-side refrigerant piping, and a high order-side refrigerating cycle configured by connecting a high order-side compressor, a heat exchanger exchanging heat between a high order-side refrigerant and a cooled medium, a high order-side expansion valve, and the cascade heat exchanger by high order-side refrigerant piping, are thermally connected through the cascade heat exchanger. In starting the refrigeration device, the low order-side compressor is started, and then the high order-side compressor is started. According to this invention, the loss in starting up the refrigerating cycle in the binary refrigeration device can be suppressed, and the degradation of heating performance due to deterioration of start-up can be suppressed. |
