Graphite tower equipment is a kind of equipment that uses the contact of water and air to dissipate waste heat generated in industry or in refrigeration and air conditioning through evaporation. The basic principle is: after the dry (low enthalpy) air is drawn by the fan, it enters the cooling tower from the air inlet network; the high temperature water molecules with high saturated steam partial pressure flow to the low pressure air, damp heat (high enthalpy) The water from the sowing system is sprinkled into the tower. When the water droplets contact air, on the one hand, due to the direct heat transfer between the air and the air, on the other hand, due to the pressure difference between the surface of the water vapor and the air, evaporation occurs under the action of pressure, which brings the current latent heat of evaporation. Take away the heat in the water, that is, evaporate and transfer heat, so as to achieve the purpose of cooling down. The working process of graphite tower equipment: Take the working process of a circular counterflow cooling tower as an example: hot water flows from the main engine room through the water pump at a certain pressure through the pipeline, horizontal throat, curved throat, and central throat to press the circulating water to the graphite tower equipment In the water sowing system, water is evenly spread on the packing through the small holes on the sowing pipe; the dry low-value air enters the tower from the bottom of the wind net under the action of the fan, and the hot water flows through the surface of the packing At that time, a water film is formed to exchange heat with the air, and the hot air with high humidity and high humidity is drawn from the top, and the cooling water drops into the bottom basin, and flows into the host through the outlet pipe. Under normal circumstances, the air entering the tower is dry air with low wet bulb temperature. There is obviously a difference in the concentration of water molecules and a difference in kinetic energy pressure between water and air. When the fan is running, under the action of the static pressure in the tower, The water molecules continuously evaporate into the air and become water vapor molecules, and the average kinetic energy of the remaining water molecules will decrease, thereby reducing the temperature of the circulating water. It can be seen from the above analysis that evaporation cooling has nothing to do with air temperature (usually said dry bulb temperature) lower or higher than water temperature, as long as water molecules can continuously evaporate into the air, the water temperature will decrease. However, the evaporation of water into the air does not go on endlessly. When the air in contact with water is not saturated, water molecules continuously evaporate into the air, but when the air on the water-air contact surface reaches saturation, the water molecules cannot evaporate, but are in a state of dynamic equilibrium. The number of water molecules that evaporate is equal to the number of water molecules returning from the air to the water, and the water temperature remains constant. It can be seen that the drier the air in contact with water, the easier it is to evaporate, and the water temperature is likely to decrease.
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