大空间设置上、下悬窗自然排烟效果对比研究

为研究大空间设置上、下悬窗自然排烟效果的差异,采用FDS软件针对某大空间在不同开窗形式、环境风下室内温度、能见度、CO浓度和烟气蔓延规律进行分析.结果 表明:无风时,上、下悬窗均能够有效排烟,但下悬窗总排烟量比上悬窗高出30％,开下悬窗时,室内温度安全区域的临界高度比上悬窗高出27％,能见度安全区域的临界高度比上悬窗高...

Comparative analysis on natural smoke exhaust effect of top and bottom hung windows in large space

In order to study the difference of natural smoke exhaust effect between top and bottom hung windows in large space,the FDS software was used to analyze the indoor temperature,visibility,CO concentration and smoke spread laws in a large space under different window opening forms and environmental wind.The results showed that when there was no wind,the smoke could be exhausted effectively through top and bottom hung windows,but the total smoke exhaust rate of the bottom hung window was 30%higher than that of top hung window.When the bottom hung window was opened,the critical height of the indoor temperature safety zone was 27%higher than that of top hung window,and the critical height of the visibility safety zone was 10%higher than that of top hung window.When the wind speed was 3 m/s,the natural smoke exhaust of the top hung window failed,and the visibility at 2 m above ground was less than 10 m.However,the bottom hung window could still effectively exhaust smoke,and the indoor smoke layer temperature was 17%lower than that of top hung window,and the critical height of indoor visibility safety zone was 65.3%higher than that of top hung window.Therefore,the bottom hung window should be preferred for the smoke exhaust in buildings.If the top hung window was needed,the influence of environmental wind on the natural smoke exhaust could be reduced by closing the windward hung window,and the opening angle of leeward hung window could be increased to increase the effective smoke exhaust area,so as to achieve good smoke exhaust effect.