| 摘要 |
PROBLEM TO BE SOLVED: To enable lowering of design pressure in a refrigeration device using carbon dioxide as a refrigerant in a secondary side refrigerant circuit. SOLUTION: The refrigeration device 1 is constituted by heat-exchangeably connecting a vaporizer 11 of a primary side refrigerant circuit 4 and a condenser cascade 14 of the secondary side refrigerant circuit 6, and uses carbon dioxide as the refrigerant in the secondary side refrigerant circuit 6. After a compressor 7 composing the primary side refrigerant circuit 4 is started, a compressor 12 of the secondary side refrigerant circuit 6 is started after a predetermined time elapses. The inconvenience that the discharge pressure suddenly rises transiently at starting the secondary side refrigerant circuit 6, is avoided to lower the design pressure. COPYRIGHT: (C)2004,JPO&NCIPI
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