It consists of 4 sets of cooling towers, all of which are the open type. The cooling water is pressurized by the circulating water pump and is then sent to the heat exchanger at each production device for heat exchange. After that, the circulating water is sent to the top of the cooling tower through the residual pressure; through the heat exchange between the water and the gas pumped by the fan at the top of the tower, the cooled water flows into the pool and is then pressurized and sent out by the circulating water pump for cyclic use.