Compound ventilation mode is adopted in this system, so that natural draught and mechanical ventilation can alternately function under different conditions.
采用混合式通风方式，自然通风和机械通风可以依据不同的条件交替运行。
The effect of horizontal wind on the performance of natural draught counter flow cooling towers is a very important and unsolved problem.
横向风对冷却塔运行特性的影响，是一个重要而没有解决的问题，很多文献的结论甚至相反。
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