Applicability of variable flow control algorithm for cooling water system of central air conditioning

Presents the principles of variable flow fuzzy control algorithm and PI control algorithm for cooling water. Compares the application effects of the two control algorithms in the cooling water constant temperature difference system by experiments, and studies their applicability.The results show that the PI control algorithm of the cooling water system is simple in structure, and can achieve control and the high control precision only by reasonable PI parameter setting, but PI control is not good at adaptability, and the adjustment rate of water pump is high. The fuzzy control algorithm system converges quickly, the curve is smooth and the fluctuation is small, the adjustment rate of water pump is low, but the control precision is not high. In practical application, the control algorithm should be selected according to the requirements of users on dynamic performance, steady state performance and steady state error of the system.