Abstract
Seawater is usually used to cool down condensers in centralized air-conditioning systems in Hong Kong where the fresh water is very scarce.Optimal control is among the means to improve energy efficiency in air-conditioning system.This paper presents an adaptive optimal control strategy to optimize the seawater pressure set-point of variable-speed seawater pumps aiming at minimal energy consumptions.This optimization is achieved by adjusting the pressure set-point according to the estimated derivative of the total power with respect to seawater pressure differential.This strategy is validated using simulations.The tests show that significant saving in the overall energy consumption of the chilling system can be achieved by properly resetting the pressure set-point only.
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