Calculation Method of the Heat Dissipation Area of the Copper Tubes in Closed Cooling Towers and Answers to Questions-Wuxi Ark Fluid Technology Co., Ltd

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Calculation Method of the Heat Dissipation Area of the Copper Tubes in Closed Cooling Towers and Answers to Questions

Release time：

2022-11-30

The cooling water process of the cooling tower belongs to the heat and mass transfer process. The cooled water is distributed to the filler inside the cooling tower with nozzles, water distributors or water distribution trays, greatly increasing the contact area between water and air. The air is circulated by the induced effect of fan, forced air flow, natural wind or jet.
1. In the traditional design, the closed cooling tower receives air from the lower part or the upper part of the tower body. In this case, the flow area is small and the flow resistance is large, which not only affects the heat exchange effect, but also increases the use of materials. From the current market situation, this is very unfavorable
2. Closed cooling tower condenser: the condenser is the core component of the cooling tower, and its reasonable structure size and reasonable layout will directly affect the heat exchange efficiency of the whole cooling tower, and also affect the cooling capacity of the whole cooling tower for cooling water. The inclined arrangement of the condenser is conducive to draining the water in the condenser in winter to prevent the copper tube from freezing and cracking
3. During the daily operation of closed cooling tower, some technical parameters must be measured to monitor whether the operation level of closed cooling tower reaches the control economic indicators. Therefore, the following technical parameters should be monitored on time and recorded in the operation log:
Stainless steel closed cooling tower, the system resistance of this type of cooling tower is reduced to 1/2 of the original due to the elimination of filler. Under the same fan condition, it can be seen from the fan characteristic curve that the air volume increases to 1.2 times of the original. The gas water ratio has also increased to 1.2 times of the original, so the cooling temperature difference is 2 ℃ higher than that of the packed tower. The packing free spray type cooling tower spray with even particles, no blockage, no maintenance, and stable and reliable operation. As the cooling element (high efficiency and low pressure centrifugal atomizer) of the packless cooling tower sprays water into 0.5mm tiny droplets, its specific surface area is much larger than the specific surface area of water dispersed into a film by the packing. The air water heat transfer surface area is large and the water distribution is uniform, which avoids the uneven temperature distribution at the cooling point caused by the dead zone and channel flow caused by the aging, deformation and blockage of the packing. The cooling effect is obviously better than that of the packed tower.
Question 1: The return water temperature of the closed cooling tower is 35 ℃, and the outlet water temperature is 20 ℃. Do you need to take anti freezing measures? In addition, how to clean the scale on the copper pipe?
If the return water temperature of closed cooling tower is 35 ° C and the outlet water temperature is 20 ° C, then antifreeze measures are not required, because freezing will not occur at this temperature. Organic acid can be used to clean the scale damaged by the copper pipe of the cooling tower. However, before use, test should be carried out to see if there is any reaction between the two to avoid damaging the copper tube.
Question 2: What is the heat transfer coefficient of closed cooling tower mainly related to?
The heat transfer coefficient of the closed cooling tower mainly has three related factors, namely, the convection heat transfer coefficient of the fluid in the pipe, the heat transfer coefficient of the pipe wall, and the convection heat transfer coefficient of the spray water outside the pipe. Moreover, these three parameters are very important, so we should not underestimate them.

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