Motor-driven pumps recirculate chilled water and hot water in heating, ventilation and air conditioning systems. The purpose of this paper is to develop an optimal pump sequencing control with improved water-wire efficiency model. First, the wire-to-water efficiency of VFD-motor-pump systems is improved by applying a motor equivalent circuit method to calculate the motor efficiency at variable frequency, and then the wire-to-water efficiency is simulated and applied to develop the optimal operating regions for a secondary chilled water system with three parallel pumps.
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