冷却水循环系统主要以水作为冷却介质，并循环使用的一种冷却水系统。主要由冷却设备、水泵和管道组成。冷水流过需要降温的生产设备（常称换热设备，如换热器、冷凝器、反应器）后，温度上升，如果即行排放，冷水只用一次（称直流冷却水系统）。使升温冷水流过冷却设备则水温回降，可用泵送回生产设备再次使用，冷水的用量大大降低，常可节约95%以上。冷却水占工业用水量的70%左右，因此，循环冷却水系统起了节约能耗作用。
A cooling water system in which water is used as cooling medium and is recycled.It is mainly composed of cooling equipment, water pump and pipeline. After cold water flows through production equipment that requires cooling (often referred to as heat exchanger, condenser, reactor), the temperature rises and, if discharged immediately, cold water is used only once (called a direct current cooling water system).If the temperature and cold water flow through the cooling equipment, the water temperature will drop back and the production equipment can be pumped back to use again.The amount of cold water is greatly reduced，It often saves more than 95%.Cooling water accounts for about 70% of the industrial water consumption. Therefore, the recirculating cooling water system has the function of saving energy.
