Patent ID: 9599395
Date: 2017-03-21
CPC Classifications: F25B,F25D

Claim:
1. A refrigerating apparatus comprising: a plurality of high temperature side cycle units each forming a high temperature side circulation circuit in which a high temperature side compressor, a high temperature side condenser, a high temperature side expansion unit and a high temperature side evaporator are connected by first pipes to circulate a high temperature side refrigerant; a low temperature side cycle unit forming a low temperature side circulation circuit in which a low temperature side compressor, a plurality of low temperature side condensers, a low temperature side expansion unit and a low temperature side evaporator are connected by second pipes to circulate carbon dioxide as a low temperature side refrigerant; a plurality of cascade condensers formed by the respective high temperature side evaporators of the plurality of high temperature side cycle units, and the respective low temperature side condensers, and each exchanging heat between the high temperature side refrigerant and the low temperature side refrigerant; and a control unit controlling so as to sequentially lower evaporation temperatures in the high temperature side evaporators related to the respective low temperature side condensers in the cascade condensers in such order that the low temperature side refrigerant flows in and out from the low temperature side condensers, wherein, in at least a part of the high temperature side cycle units, bypass pipes are connected in parallel with the high temperature side compressor and the high temperature side expansion unit, respectively, and the control unit configured to control evaporation temperatures in the respective high temperature side evaporators of the high temperature side cycle units to be different from each other, with respect to each high temperature side cycle unit which has the bypass pipes, which has the evaporation temperature which is controlled to be different from the evaporation temperature of another one of the high temperature side evaporators of another one of the high temperature side cycle units, the control unit: