A cooling tower is a device used to lower the temperature of water, primarily through heat exchange between water and air. Cooling tower is water as a circulating coolant, from a system that absorbs heat discharged into the atmosphere to reduce the temperature of the water device. Its working principle is: the use of water and air flow contact with cold and heat exchange to produce steam, steam volatilization to take away heat, to achieve the effect of evaporation and heat dissipation, convective heat transfer and radiation heat transfer, so as to dissipate the residual heat generated in industry or refrigeration and air conditioning.