Performance of the Static Smoke Exhaust System with Low Pressure Drop across the Vent in Atria

摘要：

For a static smoke exhaust system, buoyancy of the smoke layer is the driving force for smoke removal. However, because of the large volume space, conditions of having near-zero pressure drop across a horizontal ceiling vent might be often encountered. Under these conditions, the traditional vent flow model might not be suitable for describing the vent flow, bidirectional across the horizontal vent might be resulted. The smoke exhaust efficiency might greatly decrease once this occurs. Performance of the static smoke exhaust system with low pressure drop across the vent will be investigated in this paper. The critical pressure difference and the related critical smoke layer thickness would be deduced for preventing the bidirectional flow occurring. The net mass exhaust rate would be also derived for the bi-directional flow. These results should be useful for determining the opening time of the static smoke exhaust system or justifying whether the mechanic smoke system is needed for an atrium fire.

关键词： horizontal ceiling vent atrium building static smoke exhaust low pressure difference

作者: LI Junmei CHOW Wan Ki LI Yanfeng LIU Yun SUN Hong

作者单位: The College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100214,Ch Department of Building Services Engineering,The Hong Kong Polytechnic University,Hong Kong,China China Airport Construction Group Corporation of CACC,Beijing 100101,China

会议类型: 国际会议

会议名称: The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)

会议地点: 北京

会议语种:英文

页码: 839-843

在线出版日期: 2008-09-24（万方平台首次上网日期，不代表论文的发表时间）