REFRIGERATION CYCLE APPARATUS AND METHOD FOR CONTROLLING REFRIGERATION CYCLE APPARATUS

摘要

A refrigeration cycle apparatus includes: a low-stage refrigeration cycle including a low-stage compressor, a low-stage condenser, a low-stage pressure reducing device, and a low-stage evaporator, and circulating low-stage refrigerant; a high-stage refrigeration cycle including a high-stage compressor, a high-stage condenser, a high-stage pressure reducing device, and a high-stage evaporator, and circulating high-stage refrigerant; a cascade condenser exchanging heat between the low-stage refrigerant in the low-stage condenser and the high-stage refrigerant in the high-stage evaporator, and a controller. The low-stage refrigerant is a refrigerant that undergoes disproportionation. The low-stage refrigerant is maintained at a pressure lower than a disproportionation pressure at which the low-stage refrigerant undergoes disproportionation.

主权项

1. A refrigeration cycle apparatus comprising:
a low-stage refrigeration cycle including a low-stage compressor, a low-stage condenser, a low-stage pressure reducing device, and a low-stage evaporator, and circulating low-stage refrigerant; a high-stage refrigeration cycle including a high-stage compressor, a high-stage condenser, a high-stage pressure reducing device, and a high-stage evaporator, and circulating high-stage refrigerant; a cascade condenser configured to exchange heat between the low-stage refrigerant in the low-stage condenser and the high-stage refrigerant in the high-stage evaporator; and a controller, the low-stage refrigerant being a refrigerant that undergoes disproportionation, the low-stage refrigerant being maintained at a pressure lower than a disproportionation pressure at which the low-stage refrigerant undergoes disproportionation.