环形中庭排烟方式对比分析

Comparative analysis of smoke extraction modes for circular atrium

采用FDS模拟对某大型综合体建筑中的环形中庭的机械排烟和竖井自然排烟两种模式进行了对比分析。通过各排烟口烟气参数的定性及定量分析,提出综合排烟效果值来判断该位置采取不同排烟模式的效果优劣。结果表明,距离火源位置较近时,竖井自然排烟效果较好,综合排烟效果值小于1;而远离火源位置时,机械排烟效果较好,综合排烟效果值大于1。可以采用机械排烟与自然排烟相结合的排烟方案,得到最优的排烟效果。

Comparative analyses chanical smoke exhaustion and have been carried out on me- shaft natural ventilation modes for a large circular atrium by FDS Simulation. By qualitative and quantitative analysis on the smoke factors of each exhaust port, a smoke exhaustion effectiveness factor was proposed to- determine the exhaustion effectiveness for different smoke ex- traction modes. It has been found that when the position of smoke extraction points are close to the fire origin, shaft natu-ral ventilation has higher exhaustion efficiency （extraction ef- fectiveness〈l）; when the position of smoke extraction points are far from the fire origin, mechanical smoke exhaustion has higher exhaustion efficiency （extraction effectiveness〉1）. A smoke extraction strategy combining mechanical smoke exhaust and natural ventilation can result in an optimized smoke effect.