Hydraulic simulation and optimization of cooling watercircuit of district cooling systems

A detailed hydraulic simulation model is developed for the cooling water circuit of district cooling system (DCS), and the design and operation data of Qianhai DCS plant No. 10 phase 1 in Shenzhen are analysed by combining theoretical and experimental analysis. The experimental results show that the simulation model can accurately calculate the pressure drops of the whole pipeline system and the segmented pipeline, and can accurately predict the hydraulic phenomenon of the cooling water pipeline, which can be used for engineering analysis. The simulation model is used to obtain the resistance of all pipe fittings and the mechanical power consumption of each pipe fitting, and a drag reduction optimization method of the high efficiency chiller plant pipelines is proposed. The comparison with the traditional design calculation model shows that the local resistance coefficient of 90°elbow,tee and other pipe fittings in the traditional hydraulic calculation is too large, which leads to a large deviation between the calculation result of the pump head of the pipeline and the actual value.