To provide a refrigeration cycle device of high stability, improved in followability to change of a refrigeration cycle state.
The refrigeration cycle device includes a low temperature-side refrigeration cycle 110 having a low temperature-side compressor 111 for compressing a low temperature-side refrigerant, a cascade heat exchanger 112, a low temperature-side pressure reducer 113, and a low temperature-side heat exchanger 114 exchanging heat with a heat source, a high temperature-side refrigeration cycle 120 having a high temperature-side compressor 121 for compressing a high temperature-side refrigerant, a high temperature-side heat exchanger 122 exchanging heat with a heat medium, a high temperature-side pressure reducer 123, and the cascade heat exchanger 112 exchanging heat between the low temperature-side refrigerant and the high temperature-side refrigerant, and a control portion. As the low temperature-side compressor is controlled during a control cycle of the high temperature-side compressor, followability to the change of low temperature-side refrigeration cycle state due to change of an operating condition of the high temperature-side refrigeration cycle is improved, and the stability as the refrigeration cycle device can be improved.
MORIWAKI SHUNJI
AOYAMA SHIGEO
Daisuke Nagano
Kentaro Fujii
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