Effect Of Wet Bulb Temperature On Cooling Capacity
Many users have given us feedback that when using a closed cooling tower, the cooling effect of the closed cooling tower will be affected in cloudy or rainy weather, especially when it rains, the cooling capacity can be different from normal conditions About 1 times. Especially in the southern region, due to the influence of the rainy season, if the selection of the closed cooling tower is relatively small, it may cause the cooling temperature to fail to achieve the expected effect.
The minimum cooling temperature of the closed cooling tower is the wet bulb temperature + 3 degrees Celsius. When the wet bulb temperature is changed by meteorological conditions, it will affect the cooling effect of the closed cooling tower. When the dry bulb temperature of the ambient air changes, the temperature of the water outlet of the closed cooling tower is detected, and the temperature change is very small, which can produce a maximum expected cooling temperature difference of 1-2 degrees.
- In rainy weather, when the dry bulb temperature is similar to the wet bulb temperature, the cooling capacity drops significantly.
Cause Analysis:
In rainy weather, the temperature difference between the wet bulb temperature and the dry bulb temperature is relatively small, the partial pressure of water vapor in the air increases, and the force of mass transfer decreases, resulting in a decrease in the amount of evaporated water in the closed cooling tower, resulting in heat dissipation. If the cooling capacity is reduced, the temperature of the water outlet will increase, which is the performance of the obvious reduction in cooling capacity.
- In sunny weather, the temperature difference between the dry bulb temperature and the wet bulb temperature is relatively large, and the cooling capacity is better.
Cause Analysis:
In sunny weather, the dry bulb temperature will definitely be higher than the temperature, and the temperature difference will be relatively large. The air is relatively dry and contains less water, so the partial pressure of water vapor in the air is also relatively small. This is because when spraying evaporated water for heat exchange, The speed of spraying evaporated water is accelerated, the heat dissipation is increased, and it has a better heat transfer effect, so it has a better cooling effect.
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