The theoretical models for description of the heat and mass transfer on surfaces of fillers in cooling towers are related to an empirical coefficient the mass transfer coefficient.
2
以聚氯乙烯(PVC)为材质的冷却塔塑料淋水填料由于表面凹凸不平和厚薄不匀，无法用标准方法进行检测。
Being rough and uneven in surface and thickness, plastic cooling fillers for cooling tower which are made from polyvinyl chloride (PVC) doesn't examined with standard method.
3
介绍了空气预冷系统的不同流程以及喷淋式、 塔板式、 填料式冷却塔，分析了其优缺点；
The paper describes the different processes relating to air precooling systems and cooling towers of spray type, perforated plate type and packed type with their advantages and deficiencies analyzed.
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