Effect of cavity depth on smoke spreading of double-skin façade
Effect of cavity depth on smoke spreading of double-skin façade
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DOI：
10.1016/j.buildenv.2005.04.009
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发表时间：
2006-07
影响因子：
7.4
通讯作者：
W. Chow;W. Hung
中科院分区：
文献类型：
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作者：
W. Chow;W. Hung
玻璃窗在远东的建筑业中非常受欢迎。可能的原因是它提供了理想的观点，良好的环境设计和良好的外观。设计了许多全高幕墙玻璃配置。然而，人们担心增加热带地区的冷负荷。双层幕墙是建筑玻璃中减少太阳辐射得热的一种。这种设计可能会引起火灾问题，许多此类项目未能遵守消防安全规范。工程方法类似于性能化防火规范在一些国家的做法，以证明设计是安全的。火灾危险评估应得到深入调查的支持。通过物理模型实验，研究了这一新建筑特征的火灾危险性。在中国东北偏远地区的一个装置被选择用于DSF特征的部分的全尺寸燃烧试验。空腔深度被确定为关键因素。本文将讨论空腔深度对火蔓延的影响。提取了用玻璃板进行的四组测试的数据以澄清这一点。测量并分析了试板表面温度和热流密度。玻璃板上发现的裂纹图案和倒塌（如果有的话）也被记录下来。观察了烟在两层玻璃之间的空气腔中的运动模式，并与测量的内外玻璃板的表面温度进行了比较。
Glazing has been very popular among the construction industry in the Far East. Possible reasons are that it offers the desired views, favorable environmental design and good appearance. Numerous glass configurations with full-height curtain wall were designed. However, there are concerns on increasing the cooling load in tropical areas. Double-skin façade (DSF) is one of the architectural glass features to reduce the solar heat gain. This design might give fire problems and many such projects failed to comply with the fire safety codes. Engineering approach similar to performance-based fire codes practicing in some countries was applied to demonstrate the design is safe. Fire hazard assessment should be supported by in-depth investigations. Experiments with physical scale models were carried out to investigate the fire hazard of this new architectural feature. A facility developed in a remote area of Northeast China was selected for the full-scale burning tests on part of the DSF feature. The cavity depth was identified as the key factor. The effects of the cavity depth on fire spreading will be discussed in this paper. Data from four sets of tests performed with glass sheets were extracted to clarify this point. Surface temperature and heat flux received on the test panels were measured and analyzed. Cracking patterns found on the glass panels and collapse, if any, were also recorded. Smoke movement patterns inside the air cavity between the two layers of glass were observed and compared with the measured surface temperature of the inner and outer glass panels.