| 摘要 |
A refrigerating system comprises screw compressor means which is adapted to control the capacity thereof by means of a slide valve provided in the compressor means and operatively associated with hydraulic actuator means. The hydraulic actuator means has hydraulic fluid supplying means and hydraulic fluid discharging means, both of which are connected thereto and provided with stop valve means, respectively, for controlling the supply and the discharge of a hydraulic fluid to and from the hydraulic actuator means to permit the latter to hydraulically actuate the slide valve. The refrigerating system further comprises means for selectively switching the operation mode of the system, means for detecting the outlet water temperature of an indoor heat exchanger of the system, and temperature control means for setting a water temperature for service. The temperature control means has a timer built therein and an arithmetic and logic circuit adapted to determine the operation period for the timer in proportion to the difference between the set water temperature and the outlet water temperature inputted from the detecting means. The slide valve is hydraulically actuated to effect the capacity control in proportion to the temperature difference under the control of control circuit means provided for interconnecting the timer with the stop valve means.
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