Study on optimization operation strategy of metro station air conditioning system with variable water temperature

In order to further optimize the variable water temperature operation strategy of the air-conditioning system to improve the energy saving performance, under the premise of meeting the thermal comfort requirements of building rooms in a sub-way station in Zhengzhou City, the most unfavorable room corresponding to the final equipment of the air-conditioning system was taken as the research object to study the rule of temperature and humidity changes with the supply chillered water temperature in the room during the air-conditioning period. The influence of supply chillered water temperature on indoor comfort under different load rates is analyzed. On this basis, the optimal control strategy of the supply chillered water temperature in the whole cooling season is set according to the room load rate, and the energy saving analysis is carried out. Under the condition that the indoor environment meets the requirements of thermal comfort temperature and humidity, the optimal chillered water temperature under different load rates is calculated. The research results show that the energy saving rate of the chiller is 13.06%, which effectively reduces the energy consumption of the system.