通过理论分析和实验研究相结合的方法，研究了空气冷却器壁面的表面自由能对凝露或结霜的形态及空冷器工作性能的影响。

This paper studies the influence of free energy on the surface of air coolers on the forms of condensation or frostiness and the performance of air coolers, through theory and experiments.

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直接蒸发式空气冷却器是利用原有的湿表面工作的。

The direct type of evaporative air cooler uses primary wet surfaces.

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