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METHODS AND SYSTEMS FOR CONTROLLING A CHILLER SYSTEM HAVING A CENTRIFUGAL COMPRESSOR WITH A VARIABLE SPEED DRIVE
METHODS AND SYSTEMS FOR CONTROLLING A CHILLER SYSTEM HAVING A CENTRIFUGAL COMPRESSOR WITH A VARIABLE SPEED DRIVE
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机译:用于控制具有离心式压缩机的变速系统的冷却器系统的方法和系统
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摘要
Methods and systems for controlling a chiller system to achieve control stability while maintaining optimum efficiency. Particularly, methods and systems for controlling a centrifugal compressor speed and an inlet guide vane position that establishes three distinct regions in the control path: (i) during initial unloading from full load, the inlet guide vane position is kept at a fully open position while the centrifugal compressor speed is changed to achieve the desired cooling capacity; (ii) between an inflection point and a transition point, keeping the centrifugal compressor speed constant while the inlet guide vane position is changed to achieve the desired cooling capacity; and (iii) between the transition point and zero cooling capacity, changing both the inlet guide vane position and the centrifugal compressor speed to achieve the desired cooling capacity.
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