| 摘要 |
PROBLEM TO BE SOLVED: To change the number of operating compressors according to the load in a cabinet. SOLUTION: When the operating time of one of two compressors 12 for one cycle is detected and the operating time is found to be shorter than a predetermined value while two compressors 12 are operating, the load in the cabinet is considered to be small, and the number of operating compressors 12 is changed into one. The operating time is corrected for a long time when the compressor 12 is controlled and operated. When restricting to be one, the compressor 12 with smaller integrated time of the operating time up to that time is selected with the priority as the operating one. The operating time of both the compressors 12 is equalized and it is prevented to have difference in useful life. When one compressor is controlled/operated and operated for a predetermined time period, the number of operating compressors is changed into two. When the continuous operation of the compressor 12 is long, the in-cabinet load is too large to reduce the in-cabinet temperature to a set temperature. In such a case, by increasing the number of operating compressors 12, the in-cabinet temperature can be quickly lowered to the set temperature. COPYRIGHT: (C)2005,JPO&NCIPI
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