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1．引言随着上海城市建设的大规模进行，高层建筑如雨后春笋，不断出现。为营造一个舒适环境的需要，一般大楼都配备中央空调系统。中央空调系统包括冷却水和密闭水系统，循环冷却水系统由冷却水泵、管道、冷却塔、冷冻机的冷凝器、集水池等部分组成的一敞开式回路。密闭水系统
1. Introduction With the large-scale urban construction in Shanghai, high-rise buildings are springing up and appearing constantly. To create a comfortable environment, the general building is equipped with a central air conditioning system. The central air-conditioning system includes a cooling water and a closed water system. The circulating cooling water system is an open circuit composed of a cooling water pump, a pipeline, a cooling tower, a condenser of a freezer, a water collecting tank, and the like. Closed water system