Fire-induced smoke control via hybrid ventilation in a huge transit terminal subway station
Fire-induced smoke control via hybrid ventilation in a huge transit terminal subway station
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DOI：
10.1016/j.enbuild.2011.11.018
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发表时间：
2012-02-01
影响因子：
6.7
通讯作者：
Deng, Baoshun
中科院分区：
文献类型：
--
作者：
Gao, Ran;Li, Angui;Deng, Baoshun
混合通风是将自然通风和机械通风相结合的建筑通风系统，为建筑创造一个高效、健康的通风系统。在这里，混合通风被用来控制火灾引起的烟雾在一个巨大的交通终端地铁站。对四种不同的网格系统进行了比较，并分析了这些网格系统的灵敏度。分析了混合通风对降低一氧化碳（CO）浓度和抑制烟气水平扩散的作用。热释放速率、垂直方向烟温、烟层高度和CO浓度与前人实验数据进行了验证，结果吻合较好。初步结果表明，随着屋顶开窗尺寸和换气速率的增加，大厅内CO平均浓度显著降低。而心房CO浓度差异不大。与传统的机械通风相比，混合通风能更有效地抑制烟气的扩散。地铁车站水平方向CO浓度明显低于常规机械通风。建议在中庭天花板设置3米× 3米或更大的顶窗，是一种有效的排烟方法。(c) 2011 Elsevier B.V.版权所有
Hybrid ventilation is the building ventilation system that integrates natural and mechanical ventilation components to create a high efficiency and healthy ventilation system for a building. Here, hybrid ventilation is used to control fire-induced smoke in a huge transit terminal subway station. Four different grid systems are compared, and the sensitivities of these gird systems are analyzed. The effect of hybrid ventilation on carbon monoxide (CO) concentration reduction and its suppression effect on horizontal dispersion of smoke are also analyzed. Heat release rate, smoke temperature in the vertical direction, smoke layer height and CO concentration are validated with previous experimental data, and good agreement is achieved.Preliminary results show that the average CO concentration in the hall decreases significantly with increasing roof window size and air change rate (ACH). However, little CO concentration difference in the atrium can be observed. Comparing with the conventional mechanical ventilation, hybrid ventilation can inhibit the dispersion of smoke more effectively. The CO concentration in the subway station in the horizontal direction is significantly lower than that with conventional mechanical ventilation. It suggests hybrid ventilation by setting roof window in the ceiling of the atrium with size of 3 m x 3 m or larger can be an effective method to exhaust fire-induced smoke. (c) 2011 Elsevier B.V. All rights reserved.