Heat flux profile upon building facade due to ejected thermal plume from window in a subatmospheric pressure at high altitude
Heat flux profile upon building facade due to ejected thermal plume from window in a subatmospheric pressure at high altitude
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高海拔负压下从窗户喷出的热羽流导致建筑物立面的热通量分布
DOI：
10.1016/j.enbuild.2015.02.002
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发表时间：
2015-04
影响因子：
6.7
通讯作者：
Shi Q.
中科院分区：
文献类型：
--
作者：
Tang F.;Hu L. H.;Lu K. H.;Zhang X. C.;Shi Q.
本文比较了低气压(西藏拉萨，千帕，海拔3650m)和常压(合肥，100千帕，海拔50m)下，从窗户喷出的热羽在建筑外立面上的热流分布，并提出了这两种压力的全球关联式。在一个0.4米的立方模型上，在这两个高度上安装了外墙和不同几何形状的窗户，进行了一系列实验，以研究环境压力对热烟羽从房间喷出的外立面热流分布的影响。采用水冷热流计阵列测量了立面壁面的垂直热流密度分布。结果表明，在低气压下，窗户附近立面的热流密度分布远高于常压下的热流密度分布。提出了一个新的全球关联式，通过考虑这两个压强的相对夹带变化来描述热羽流区外立面上热通量的垂直分布。
This paper compares the heat flux profile upon building external facade due to ejected thermal plume from window in a subatmospheric pressure (64 kPa, Lhasa, Tibet, altitude: 3650 m) with that in normal pressure (100 kPa, Hefei, altitude: 50 m) and proposes a global correlation for these two pressures. A set of experiments is carried out in a 0.4 m cubic scale room model with a facade wall attached and a window of various geometries in these two altitudes to study the influence of the ambient pressure on the heat flux profile upon external facade due to ejected thermal plume from the room. Water-cooled heat flux gage arrays are employed to measure the vertical heat flux profile upon the facade wall. It is found that the heat flux profile upon the facade wall in the vicinity of window is much higher in the subatmospheric pressure than that in the normal pressure. A new global correlation is proposed to characterize the vertical profile of the heat flux upon external facade in the thermal plume region by accounting for relative entrainment change in these two pressures.
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