Research on performance optimization of cold chain ventilation and air conditioning system in nuclear islands

The design of the cold chain ventilation and air conditioning system in the nuclear island has some problems, such as excessive margin, high operating energy consumption, and cumbersome regulation and control. To reduce the cost of nuclear power, this paper establishes a mathematical model of the main energy consuming equipment based on the actual ventilation and air conditioning system of a plant in “Hualong No.1”, determines the objective function and constraints of the system energy saving optimization, and uses the genetic algorithm to study the optimization effect of the energy saving operation of the ventilation and air conditioning system. The energy consumption of the whole system and each equipment of the two optimization schemes is calculated when the load rate changes and the load ratio of high temperature terminal and normal temperature terminal is different. The results show that when a single chiller operates, the energy saving rate of the system with the high temperature and normal temperature terminals in series is 14.1%, but the energy saving rate decreases with the increase of the terminal load ratio. When a single chiller operates, the system with the high temperature and normal temperature terminals in series and adding a high temperature chiller at the high temperature terminal has an energy saving rate of 17.2% when the load ratio is 2, and the energy saving effect is better than that of scheme 1 (12.2%).