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根据现在住宅平面分析,外门窗缝隙是微粒污染进入室内的主要途径,而对一般居家而言,则主要是外窗。分析指出以北京冬季最多北风的计算迎面风速4.7 m/s计,可形成12 Pa的压差,而10 Pa时,对4级气密性外窗就最大将有18.75 m~3/h的渗透风。当风压、热压同时作用时,总渗透风量,大多数情况下会小于纯风压时的渗透量。但在静风时,热压作用不容忽视,共同作用大于单纯风压作用,并求出了必要条件是热压>3倍风压。静风且有30℃温差时的北京4级窗渗风量为3.36 m~3/h。
According to the current residential flat analysis, the gap between the external doors and windows is the main way of particulate pollution into the interior, while for the average home, the main window is outside. The analysis shows that with the maximum wind speed of 4.7 m / s in Beijing in winter, a pressure difference of 12 Pa can be formed, while at 10 Pa, the maximum outer diameter of the four-level air tightness window will be 18.75 m 3 / h Infiltration of the wind. When the wind pressure, hot pressing at the same time, the total amount of air infiltration, in most cases will be less than pure air pressure when the infiltration. However, in the quiet wind, the hot pressing can not be ignored, and the common effect is greater than the simple wind pressure, and the necessary condition is that the hot pressing> 3 times the wind pressure. In the case of static wind and temperature difference of 30 ℃, the seepage volume of Grade 4 wind in Beijing is 3.36 m 3 / h.