The determination of the face velocity of finned tube heat exchanger not only affects the calculation method of heat transfer coefficient and air resistance, but also relates to the determination of heat balance and heat transfer area of finned tube heat exchanger. What two factors constrain the size of the headwind speed? Next, let's make a detailed analysis.
1. Increasing the face wind speed can improve the film heat transfer coefficient of finned tube heat exchanger, expand the heat transfer temperature difference and reduce the heat transfer area. However, when the wind speed is increased, the air song will expand rapidly, while the expansion of the heat transfer coefficient is relatively slow. Too high wind speed will lead to poor performance of the fan, and at the same time, it is difficult to match the motor and transmission mechanism. On the other hand, too low wind speed will lead to low heat transfer coefficient and expansion of heat exchange area and equipment cost. Therefore, the size of the frontal wind speed has a reasonable and effective range.
2. The head-on wind speed is corresponding to the total air volume. The face wind speed of finned tube heat exchanger is calculated according to the total air volume and the determined size of the windward face of the heat exchanger.
On the whole, the wind speed of finned tube heat exchanger shall be kept within a reasonable and effective range according to the total air volume and the size of the windward area from beginning to end, so as to obtain a higher heat transfer coefficient and a reasonable and effective heat transfer area, thus keeping the designed finned tube heat exchanger in the most ideal working state, further improving the working efficiency, saving raw materials and costs.
The above two factors are about the influence of the frontal wind speed of finned tube heat exchanger. For more information about the selection of finned tube heat exchanger and the design of finned tube heat exchanger, please go to the shop of Wuxi Maxwell Equipment Technology Co., Ltd.