| 摘要 |
PROBLEM TO BE SOLVED: To provide a refrigerating air conditioner capable of performing highly efficient operation by appropriately controlling the number of operating compressors in response to the operating condition. SOLUTION: The heat source machine (refrigerating air conditioner) 1 includes an upstream refrigerating cycle 2b having compressors 31b, 32b, and a downstream refrigerating cycle 2a having compressors 31a, 32a. Hot and cold water flow into a downstream water heat exchanger 5a after passing an upstream water heat exchanger 5b. A control device 12 starts an upstream compressor 31b first, then starts a downstream compressor 31a to have two compressors in operation, starts an upstream compressor 32b to have three compressors in operation, and then starts a downstream compressor 32a to have four compressors in operation. Further, the control device 12 stops the downstream compressor 32a to have three compressors in operation, then stops the upstream compressor 32b to have two compressors in operation, and then stops a downstream compressor 31a to have one compressor in operation. COPYRIGHT: (C)2009,JPO&INPIT
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