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为降低侧风对自然通风逆流湿式冷却塔进风的不利影响,引入一种优化进风的新方法——在进风口周向上安装导风板,同时,为定量分析冷却塔周向进风均匀性,定义进风均匀系数。基于热态模型实验,研究侧风工况下安装导风板对湿式冷却塔进风及热力性能的影响。通过对进风性能及冷却效率的对比分析,揭示了侧风影响冷却性能的2个根本原因:侧风不仅降低了通风量,还破坏了冷却塔周向进风的均匀性,冷却效率的降低是二者共同作用的结果。安装导风板对周向进风进行优化之后,通风量增大,进风均匀系数也有较大提高,塔内传热传质均匀性增强,冷却效率有较大提升。刘易斯因子分析表明,优化进风对传热的强化作用更大,但同时增加了绝对蒸发水损失。
In order to reduce the adverse effect of crosswind on the inlet air flow of naturally ventilated countercurrent wet cooling tower, a new method of optimizing the inlet air flow is introduced - the air deflector is installed in the circumferential direction of the air inlet, meanwhile, Define the inlet air uniformity factor. Based on the thermal model experiment, the effect of the deflector installed in the crosswind condition on the inlet air flow and thermal performance of the wet cooling tower was studied. By comparing the performance of the inlet air and the cooling efficiency, two fundamental reasons that the crosswind affects the cooling performance are revealed: the crosswind not only reduces the ventilation capacity, but also destroys the uniformity of the air entering the cooling tower in the circumferential direction. The cooling efficiency is reduced by two The result of the joint action. After installing the air deflector to optimize the air intake in the circumferential direction, the air volume increases, the uniform coefficient of the air inlet increases greatly, the heat and mass transfer uniformity in the tower is enhanced, and the cooling efficiency is greatly improved. Lewis factor analysis shows that the optimization of inlet air has a greater effect of enhancing heat transfer but at the same time increases the absolute loss of evaporative water.