The cooling tower is the use of the contact of water and air, by evaporation to disperse a device of the waste heat produced in industrial refrigeration and air conditioning. The basic principle is: the dry (low enthalpy) of air through the fan twitching, into the wind net, into the cooling tower; saturated vapor partial pressure and high temperature water molecules to the low pressure air flow, hot and humid (high enthalpy) water spilled from the water distribution system into the tower. When the contact of water droplets and air, on the one hand, due to air and direct heat transfer, on the other hand, the pressure difference exists between the surface of water vapor and air, under pressure to produce the evaporation phenomenon, brought to the latent heat of vaporization for walking, the heat of the water away that is, evaporation heat transfer, so as to achieve the purpose of cooling the cooling tower.