The cooling tower is a kind of sound design that uses the contact of water and air to dissipate the waste heat generated in industry or refrigeration and air conditioning through evaporation. The basic principle is: after the low-enthalpy value air is pumped by the fan, it enters the cooling tower from the air inlet; the high-temperature water molecules with high partial pressure of saturated steam move to the air with low pressure, and the water with high enthalpy value is mixed. Sprinkle the water system into the tower. When water droplets come into contact with air, on the one hand, due to the direct heat transfer between air and water, on the other hand, due to the pressure difference between the surface of the water vapor and the air, an evaporation phenomenon occurs under the effect of pressure, which brings the latent heat of evaporation to the When the heat in the water is taken away, it evaporates and transfers heat, thereby achieving the purpose of cooling. Working process of cooling tower:
The working process of the circular counter-flow cooling tower is an example: hot water passes the pipeline, horizontal throat, curved throat, and central throat from the main room through the pump at a certain pressure to press the circulating water into the water distribution system of the cooling tower to purify the workbench. Water is evenly spread on the filler through the small holes in the water pipe; the dry low enthalpy value air enters the tower from the bottom into the air network under the action of the fan, and the hot water flows through the surface of the filler to form a water film and air Heat exchange, hot air with high humidity and high humidity is drawn from the top, cooling water drops into the bottom basin, and flows into the host through the outlet pipe. In general, the air entering the tower is dry and low-humidity air. There is a clear difference between the concentration of water molecules and the pressure difference of kinetic energy between the water and the air. When the fan is running, under the effect of the static pressure in the tower, the water The molecules continuously evaporate into the air to form water vapor molecules, and the average energy of the remaining water molecules will decrease, thereby reducing the temperature of the circulating water.
From the above analysis, it can be seen that the cooling of the basic hair has nothing to do with the temperature of the air (commonly known as dry bulb temperature) being lower or higher than the water temperature. As long as the water molecules can continuously evaporate into the air, the water temperature will decrease. However, the evaporation of water into the air will not continue indefinitely. When the treasure gas in contact with water is not saturated, the water molecules continuously evaporate into the air, but when the air on the surface of the water gas reaches saturation, the water molecules will not evaporate, but will be in a state of low temperature. constant temperature. The number of water molecules evaporated is equal to the number of water molecules returned from the air to the water, and the water temperature remains unchanged. It can be seen from this that the drier the air in contact with the water, the easier the evaporation will take place in the low temperature thermostat, and the temperature of the water will be lowered.