NEWS CENTER
Oasis Iceberg
11
2024
-
07
What factors influence the water temperature in a closed cooling tower?
Currently, how much the liquid temperature inside the closed cooling tower coil has dropped serves as a key metric for evaluating the efficiency of the closed cooling tower. Meanwhile, the factors influencing the liquid temperature within the coil have become a major concern for users.
Currently, how much the liquid temperature inside the closed cooling tower coil has dropped serves as a key metric for evaluating the efficiency of the closed cooling tower. Meanwhile, the factors influencing the liquid temperature within the coil have become a major concern for users.
Based on the principle of evaporative cooling, increasing the exhaust air volume within a closed cooling tower enhances the interaction force between the air and the coil surface, thereby accelerating heat dissipation and lowering the fluid temperature inside the tubes. Conversely, if the exhaust volume remains insufficient, the fluid temperature will rise. Thus, this method proves to be an effective way to control fluid temperature. Moreover, if the fan is equipped with a single-speed motor, operators can restart the exhaust system when temperatures become too high during operation, ensuring that the cooling tower fan at the top of the tower returns to normal functionality.
The temperature of the cooling fluid inside the closed cooling tower coil is closely related to the heat load and the cooling water flow rate. When the flow rate of the cooling fluid in the coil increases, the fluid temperature rises; conversely, if the flow rate slows down, the fluid temperature begins to drop. Since the fluid velocity within the coil directly determines how long the fluid remains in contact with the spray water and air outside the coil, fluctuations in the wet-bulb temperature of the surrounding air will also influence the cooling fluid's temperature—though this temperature change occurs with a certain delay. Notably, it takes time for the fan to transition from its initial startup phase all the way to reaching full-speed operation.
Currently, the fans used in closed cooling towers are driven by motors and can start several times per hour. If a dual-speed motor is installed, it allows for more flexible control of the cooling fluid temperature: when the fluid temperature is slightly lower, the fan operates at half speed, while at slightly higher temperatures, the fan runs at full speed.
That concludes our introduction to the factors influencing the liquid temperature in closed cooling towers.
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