How much the temperature of the liquid in the cooling tower coil has dropped is the scale to measure the efficiency of the cooling tower. The factors that affect the temperature of the liquid in the cooling tower coil have become a concern for users. Formal closed cooling tower manufacturers have obtained many important factors based on years of practice, so they provide basic data for improving cooling towers, and are the key improvement targets for cooling tower cooling efficiency.
According to the principle of evaporative heat dissipation, when the air volume in the closed cooling tower increases, the force of the wind on the surface of the coil will increase relatively, the heat dissipation will be accelerated, and the temperature of the fluid in the tube will decrease, otherwise the temperature of the fluid will increase, so this method is The best way to control the fluid temperature, if the fan uses a single-speed motor, so when the temperature is too high during operation, you can restart the exhaust system to solve the problem, so that the cooling tower fan on the top of the tower is in normal operation.
1. The temperature of the cooling fluid in the coil of the closed cooling tower is closely related to the heat load and the amount of cooling water
Increase the flow velocity of the cooling fluid in the coil, the temperature of the fluid in the tube will increase, the flow velocity of the fluid will become slower, and the temperature of the fluid will also drop, because the velocity of the fluid in the tube determines the fluid and the spray water outside the coil, The contact time of the air, the wet bulb temperature in the local air drops, and the temperature of the cooling fluid also drops, but the temperature of the drop is different. The test shows that it takes a certain amount of time for the fan to turn from the beginning to full speed. The fan used in the current closed cooling tower is affected by the motor and can be started several times per hour. If a two-speed motor is installed, the temperature of the cooling fluid can be controlled more flexibly. The fans run at half speed when the cooling fluid temperature is slightly lower, and at full speed when the cooling fluid temperature is higher.
2. Cooling capacity of closed cooling tower
According to the cooling capacity of the cooling tower and the amount of water sprayed, it can be known that the cooling capacity changes with the amount of water sprayed. Therefore, the cooling effect of the cooling tower will become better and better as the movement capacity of the cooling tower increases. When the closed cooling tower When the cooling capacity reaches a certain peak value, the amount of spray water will continue to increase, while the increasing trend of cooling capacity will gradually slow down, so it will remain at the highest point. Therefore, it can be seen that the more spray water, the better the cooling capacity. Within a certain range of cooling capacity, appropriately increasing the amount of spray water can improve the cooling capacity. Due to the excessive water spray volume, it will not have a great impact on the cooling capacity. In addition, when the spray water volume increases, the flow resistance on the air side will increase significantly, and the power consumption of the fan will also increase accordingly, the amount of spray water is reduced, and the cooling capacity is reduced, but when it is reduced to a certain value, the amount of sprayed water will be less affected by the cooling capacity.
Therefore, when designing a closed cooling tower, the manufacturer must choose the appropriate cooling capacity and circulating water volume. In the actual cooling selection, the user can budget the cooling capacity and water volume according to the actual situation. In most cases, the theoretical The value is more consistent with the actual test value, because the air wet bulb temperature value will vary every day, so a certain range of deviation will be allowed. In the same period of time, more cooling spray water can be taken away, reducing the water vapor pressure around the cooling coil, ensuring the evaporation and heat absorption of subsequent spray water, but the larger the air flow, the better. The efficiency is the highest when the maximum cooling capacity of the closed cooling tower is reached. Therefore, in the process of using the cooling tower, it needs to be adjusted according to the relevant requirements and actual conditions, so as to obtain the ideal use effect.
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