Circular cooling tower

　　Circular cooling towers utilize counterflow gas-heat exchange technology. The main structure is made of all-steel, with fiberglass reinforced plastic panel enclosure. The tower is equipped with a maintenance ladder for regular maintenance of the top equipment. The fill is made of high-quality modified PVC inclined wave plates to increase the water distribution area; through rotary water distribution or pipe water distribution, uniform water distribution is achieved, enhancing the cooling effect. Its shape is "circular", hence the name circular cooling tower.
　　The working process of a circular cooling tower is as follows: Hot water from the engine room is pumped through pipes, horizontal throats, curved throats, and central throats to the cooling tower's water distribution system under a certain pressure. The water is evenly sprayed onto the fill through small holes in the water distribution pipes; dry air with low enthalpy enters the tower from the bottom air inlet under the action of the fan. When the hot water flows over the fill surface, it forms a water film and exchanges heat with the air. The high-humidity, high-enthalpy hot air is drawn out from the top, and the cooled water drops into the basin and flows into the main engine through the outlet pipe. Generally, the air entering the tower is dry air with low wet-bulb temperature, and there is a clear difference in the concentration of water molecules and kinetic pressure difference between the water and the air. When the fan runs, under the action of the static pressure in the tower, water molecules continuously evaporate into the air, becoming water vapor molecules, and the average kinetic 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 evaporative cooling is irrelevant to whether the air temperature (commonly known as dry-bulb temperature) is lower or higher than the 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 will not continue indefinitely. When the air in contact with the water is unsaturated, water molecules continuously evaporate into the air, but when the air on the water-air contact surface reaches saturation, the water molecules will not evaporate, but will be in a dynamic equilibrium state. The number of water molecules evaporated is equal to the number of water molecules returning to the water from the air, and the water temperature remains unchanged. From this, we can see that the drier the air in contact with the water, the easier it is to evaporate, and the easier it is to lower the water temperature.

Circular Cooling Tower