Will increasing the height of the PVC packing layer in a cooling tower improve the cooling effect of the circulating water?
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Our original packing layer in the circulating water cooling tower is 1.5 meters thick; by adding another layer of PVC packing that is 0.5 meters thick, can this improve the cooling effect?
It is possible; by increasing the height of the cooling tower, the circulation time of the water is prolonged, which in turn extends the heat exchange time, thereby improving the cooling effect.
Reply to the original poster: Whether it’s possible or not depends on whether the fan has sufficient airflow; otherwise, the angle of the fan blades needs to be increased, but it’s also necessary to ensure that the shaft power is adequate. The nozzles need to have any dirt removed so that hot water can flow downward without any blockages, and cold air can flow upward without any obstructions as well. The packing material needs to be placed properly.
Cooling towers remove heat primarily through water vapor exchange, and this process is influenced by factors such as the surface area of the packing material, its hydrophilic properties, and the volume of air flow. Although increasing the height of the packing material increases its surface area, it also raises the resistance to ventilation, which may not necessarily lead to a lower temperature. If the temperature difference in the cooling tower is low, the main reasons may be an excessive water spray density in the cooling tower, low air flow, poor hydrophilicity of the packing material, or a simple wave pattern of the packing. Therefore, your company needs to analyze the causes specifically and come up with solutions; simply increasing the height of the packing material is not sufficient.
Reply to 4# 1025199692: Why did I say earlier that it’s necessary to increase the angle of the fan blades? Otherwise, due to increased resistance, the amount of air rising will decrease.
That’s correct. To add more, it’s also necessary to check whether there is a difference between the temperature of the cold water and the wet-bulb temperature. If there is no difference or the difference is very small, then increasing the air flow rate or the time water stays in contact with the water source will be ineffective.
We reduced it by 0.5 after the modification℃
We reduced it by 0.5 after the modification℃
The 0.5-degree increase after the modification is not worth it; I wonder what the effect would be if one layer were removed?
The packing layer of the circulating water cooling tower was raised, with little change in the circulating water temperature. However, by raising the height of the air duct and increasing the roughness of its inner surface, as well as minimizing the gap between the fan blades and the inner surface of the duct, the heat exchange efficiency can be improved! :)