Optimization of water chiller sequence control based on optimal load rate

 In this paper, an optimization strategy for water chiller sequence control based on the optimal load rate is proposed to optimize the operation combination and start-stop sequence of the water chillers, so as to maximize the operating efficiency of the water chillers and reduce the energy consumption of the water chillers under the premise of meeting the building cooling demand. According to the optimization strategy, the water chiller sequence control optimization software is developed and applied to the building management system (BMS) of a building group in Hong Kong. The real-time data analysis method is used to compare the combination schemes, the average load rate and the coefficient of performance (COP) before and after the implementation of the optimization strategy, and the historical data analysis method is used to calculate the annual energy-saving rate of the water chillers. The application effect and energy-saving potential of the water chiller sequence control optimization strategy are verified. The results show that under the premise of meeting the building cooling demand, the number of the water chillers turned on in the optimized combination is less or the model is smaller, and the average load rate and average COP are significantly higher than those in the non-optimized combination. The annual energy-saving rate in 2009 and 2010 is 9.15% and 11.82%, respectively, and the energy-saving effect is obvious.