建筑外立面构件对室内自然通风效率的影响

1)深圳大学建筑与城市规划学院,广东深圳 518060; 2)深圳市建筑环境优化设计研究重点实验室,广东深圳 518060

绿色建筑; 自然通风; 计算流体力学; 扰流建筑; 外立面构件; 室内换气次数

Effects of envelope features and upstream buildings on ventilation performance of naturally-ventilated building
CUI Dongjin, ZHAO Xianglu, YUAN Lei, and ZHONG Hongfeng

1)College of Architecture and Urban Plan, Shenzhen University, Shenzhen 518060, Guangdong Province, P.R.China2)Shenzhen Key Laboratory for Optimizing Design of Built Environment, Shenzhen 518060, Guangdong Province, P.R.China

green building; natural ventilation; computation fluid dynamics; turbulence building; envelope features; air exchange rate

DOI: 10.3724/SP.J.1249.2019.06635

备注

为研究夏热冬暖地区高密度城市中建筑外立面构件(遮阳板、翼墙和阳台等)对建筑室内外气流组织与室内自然通风的影响,采用计算流体力学数值模拟,通过改变来流风向(入射角度为0°和45°)、上游扰流建筑的高宽比以及垂直与水平外立面构件,建立了18个不同案例,模拟了不同位置房间室内自然通风换气次数效果. 结果显示,当来流风向与建筑外窗法线方向成45°时,目标建筑所有房间均增加了换气次数. 同时,外立面构件对室内自然通风效果的影响高度依赖于环境因素,包括近地面风向、目标建筑方位朝向和上游扰流建筑的高度比值,这些参数的相互作用影响了流场特性,改变了立面构件对目标建筑自然通风效率的影响效果. 研究可为建筑立面优化设计提供借鉴.

In order to study the influence of building facade components(sunshade, wing wall and balcony, etc.)on indoor and outdoor air distribution and indoor natural ventilation in high-density cities being hot in summer and warm in winter, 18 different cases are established to stimulate the effect of natural ventilation frequency of different position in the room by using the computational fluid dynamics(CFD)numerical simulation method through changing the incoming wind direction(wind incidence angle α=0° and α=45°), the height width ratio of upstream turbulence buildings and vertical and horizontal facade components. The results show the target building generally has a better natural ventilation performance when the wind obliquely incidents on the building(45°). In addition,the effect on ventilation performance of wing walls is highly dependent on the environmental factors including the approaching wind directions, the orientation of the target building and height of the upstream building. The interaction of these parameters affects the flow field characteristics, and changes the effect of facade components on the natural ventilation efficiency of the target building. This study can provide reference for improving the indoor natural ventilation efficiency and air quality by the facade optimization design of the building.

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