What is the principle of wet air cooling?

The full name of wet air cooling is humidified air cooler. It utilizes cold water to evaporate on the outer surface of the tubes, thereby removing heat from the oil, and at the same time it humidifies the air by adding moisture, increasing its humidity. The heat released during the phase change of water is much greater than that resulting from temperature differences, which helps to overcome the difficulty in cooling oil when temperatures rise in summer. Its cooling capacity can even reduce the oil temperature by 2-3°C compared to the air temperature.

Air-cooled tube bundles have small fins, which serve to increase the heat exchange area and also prevent damage to the tube bundle. Water is drawn in by a pump and evenly sprayed at the top of the air cooler; as the water evaporates, it absorbs heat, taking away the heat from the tube bundle and thereby cooling the fluid inside the tube bundle to facilitate condensation cooling. The fan draws air from below upward, carrying the heat generated by evaporation to the outside environment. Variable frequency control is applied to the fans, as evaporative air cooling is sensitive to environmental disturbances; environmental temperatures have a significant impact on air cooling in both winter and summer. Therefore, it’s possible that even when the frequency is set to its maximum value in summer, the cooling effect may not be sufficient. On the other hand, in winter, it might be enough to operate the fans at 20% of their maximum speed to meet production requirements. Hence, when an air cooling system consists of multiple fans, two or three of them will have their speeds controlled via variable frequency technology. Entirely typed by hand; please correct any errors.

1. Water has a high specific heat capacity. 2. Water evaporates to some extent, and phase changes absorb a large amount of heat