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首页> 外文会议>The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)论文集 >Performance of the Static Smoke Exhaust System with Low Pressure Drop across the Vent in Atria
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Performance of the Static Smoke Exhaust System with Low Pressure Drop across the Vent in Atria

机译：静态烟气排放系统在Atria的排气口上具有低压降的性能

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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.
机译：对于静态排烟系统，排烟层的浮力是排烟的驱动力。但是，由于体积较大，可能会经常遇到水平天花板通风口压力降接近“零”的情况。在这种情况下，传统的通风口流量模型可能不适合描述通风口流量，可能会导致水平通风口双向流动。一旦发生，排烟效率可能会大大降低。本文将对静态烟气排放系统的性能进行研究，该系统的排气口压降较低。将推导出临界压力差和相关的临界烟层厚度，以防止双向流动的发生。净质量排气速率也将针对双向流量得出。这些结果对于确定静态排烟系统的开启时间或证明中庭火灾是否需要机械排烟系统是有用的。

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