Investigation on Forced Convective Heat Transfer at the Building Façade with Louver Blinds under Different Wind Directions
Investigation on Forced Convective Heat Transfer at the Building Façade with Louver Blinds under Different Wind Directions
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DOI：
10.3390/buildings12081096
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发表时间：
2022-07
期刊：
影响因子：
3.8
通讯作者：
Rongjiang Ma;Shi-qun Tao;Zhengrong Li;Yanping Yuan;Fujian Jiang
中科院分区：
文献类型：
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作者：
Rongjiang Ma;Shi-qun Tao;Zhengrong Li;Yanping Yuan;Fujian Jiang
外百叶窗是附在建筑立面上最常见的遮阳装置之一，它不仅会屏蔽太阳辐射，还会影响建筑物周围的流动，改变立面的对流热交换。为了更好地了解不同风向如何影响百叶窗式建筑外墙的对流热特性，本文进行了 CFD 模拟，并验证了之前的风洞实验。通过模拟研究了总共 63 个遮蔽情况和 7 个无遮蔽情况。研究发现，随着风攻角θ的增大，百叶窗表面的表面平均对流换热系数（CHTC）首先增大约40~50%（θ从0°到60°），然后减小60%（θ从60°到90°）。另外，随着θ的增大，百叶窗板处的对流换热率会逐渐减小。最后，对之前的相关性进行了修改，以量化风向对百叶窗和立面CHTCavg的影响，其中对流换热率的最大偏差小于18%。
Exterior louver blinds are one of the most common shading devices attached to the building façade, which will not only screen solar radiation but also affect the flow around the building and change the convective heat exchange at the façade. To better understand how different wind directions affect the convective heat properties of louvered building façades, this paper conducted a CFD simulation with the validation of previous wind-tunnel experiments. A total of 63 shading cases and 7 unshaded cases were both investigated by simulations. It was found that with the increase in wind attack angle θ, the surface-averaged convective heat transfer coefficient (CHTC) at the louvered surface will first increase by about 40~50% (θ from 0° to 60°) and then be cut down by 60% (θ from 60° to 90°). In addition, the convective heat exchange rate at the louver slats will gradually decrease with the growth of θ. Finally, modifications for previous correlations were proposed to quantify the effect of wind directions on the CHTCavg at the blinds and façade, of which the maximum deviation for convective heat exchange rate is less than 18%.