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The assessment of the performance of a windcatcher system using computational fluid dynamics

机译：利用计算流体动力学评估捕风系统的性能

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Natural ventilation is increasingly being used in modern residential buildings to minimize the consumption of non-renewable energy and the reliance on active means for environmental control. Innovative green features such as the windcatcher has made use of natural ventilation in residential buildings for increasing ventilation rate. This paper presents a numerical study of assessment of the performance of windcatcher using computational fluid dynamics. A 500 mm square windcatcher system connected to the room has been modeled for different wind speeds in the range of 0.5-6 m/s and four different wind directions. The numerical results generally agree with the published experimental results of a wind tunnel experiment. The numerical results demonstrate that the windcatcher performance is greatly influenced by the external wind speed and direction with respect to the windcatcher quadrants. In all cases studied, the maximum velocity of air entering the room is close to the external wind speed and the windcatcher system is found to be an efficient way to channel fresh air into the room. The study also shows that the airflow rate of the air entering the room increases with the wind speed and slightly decreases with the wind incidence angle when the wind speed is lower than 3 m/s. In addition, the results show that the uniformity of air inlet decreases with increasing the wind speed and the incidence angle.
机译：在现代住宅建筑中越来越多地使用自然通风，以最大程度地减少不可再生能源的消耗，并减少对环境控制的积极依赖。诸如捕风器之类的创新绿色功能已在住宅建筑中利用自然通风来提高通风率。本文提供了使用计算流体动力学评估捕风器性能的数值研究。已为连接到房间的500平方毫米捕风器系统建模，以适应0.5-6 m / s范围内的不同风速和四个不同的风向。数值结果通常与风洞实验的已发表实验结果一致。数值结果表明，捕风器性能受外部风速和风向的影响很大。在所有研究的案例中，进入房间的空气的最大速度接近外部风速，并且发现捕风器系统是将新鲜空气引导到房间的有效方法。研究还表明，当风速低于3 m / s时，进入房间的空气的风量会随风速增加而随风入射角而略微减小。另外，结果表明，随着风速和入射角的增加，进气口的均匀性降低。

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