| 摘要 |
PROBLEM TO BE SOLVED: To provide a refrigerating machine and its capacity control method capable of keeping a compressor in an operation state of high efficiency corresponding to load, to achieve an energy saving operation of the refrigerating machine. SOLUTION: As shown in Fig. 2, this vapor compression type refrigerating machine comprises an evaporator 10 producing cold water, a condenser 30 radiating heat to cooling water, a restricting mechanism 40 mounted between the condenser 30 and the evaporator 10, the compressor 20, and a motor 50 for driving the compressor 20. The compressor 20 is a centrifugal compressor comprising a suction guide vane 25, an invertor 80 is mounted for driving and controlling the motor 50, and further a control means 70 is mounted to control a capacity of the compressor 20 by controlling opening and closing of the guide vane 25, and a rotational frequency of the compressor 20 by the invertor 80. A cold water temperature detector 90 is mounted for detecting a cold water outlet temperature of the evaporator 10, and the control means 70 controls the rotational frequency of the compressor 20 and the opening and closing of the suction guide vane 25 to control the cold water outlet temperature detected by the cold water temperature detector 90 to a predetermined target value. COPYRIGHT: (C)2006,JPO&NCIPI
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