of secondary cooling when the environment temperature is higher, at the same time of air cooling spray system to spray the water to the cooler on the surface, when water evaporates able to eliminate the heat coil, so as to achieve the cooling effect. The advantage of closed cooling tower: 1, the loop closed cycle cooling medium, without impurities, ensure the purity of medium; 2, the water cycle of water use soft water, do not scale, not plug line; 3, cover an area of an area small, can accordi