通风过滤墙体自然引风性能研究

Performance of Natural-induced Air Flow Rate Through a Ventilated Wall Module with a Filtration Unit

当室外环境受到气体颗粒物的污染时,室外的污染物将很容易通过建筑物的通风口渗透到室内,污染室内环境,影响人的健康。通过实验考察了具有过滤功能的通风墙体在自然条件下的引风性能及在建筑中使用的可行性。实验结果显示,在风压和热压单独作用的条件下,当风压较小时,热压驱动的作用较风压明显,随着风压的逐渐增加,风压驱动的作用有明显的增强。在本文所设定的实验条件下,引风量的最大值发生在热压和风压的耦合作用条件下,为27.4 m^3/h。经分析发现,热压一定时,增加风压对引风量有显著的影响,而风压一定时,随着热压的增加,总引风量的增幅不明显,风压仍起到主要的驱动作用。

In the case of outdoor environment polluted by the atmospheric particular matters,the outdoor contamination can easily penetrate through the ventilate inlets into indoor environment,and then pose a serious threat to the residents ＇health. This paper investigates the outdoor air drawing rate of a ventilated wall module which contains a filtration unit,and its application in actual architectures. It is found that when the wind pressure is low,the stack pressure drive more air flow rate than the wind pressure. With the wind pressure increasing,the wind pressure played much more impact on the driven air flow rate. Under the experimental condition,the maximum value of driven air flow rate happened at the condition of combined wind and stack pressure is 27. 4 m^3/h. By comparison,in the case of the stack pressure set a constant value, increasing the wind pressure would affect the driven air flow rate significantly. However,when fixing the wind pressure,the increasing range of total driven air flow rate is not obvious,that is,wind pressure plays a main effect on the driven flow rate.