CFD simulation of cross-ventilation in buildings using rooftop wind-catchers: Impact of outlet openings

RENEWABLE ENERGY

卷:118

Article

Montazeri, H.^1,2  Montazeri, F.³ 

[1] Katholieke Univ Leuven, Dept Civil Engn, Bldg Phys Sect, Leuven, Belgium

[2] Eindhoven Univ Technol, Dept Built Environm, Bldg Phys & Serv, Eindhoven, Netherlands

[3] Isfahan Univ Technol, Pardis Coll, Mech Engn Grp, Esfahan, Iran

关键词: Wind tower;    Natural ventilation;    Wind-driven ventilation;    Indoor air quality (IAQ);    Age of air;    Ventilation efficiency;   

DOI  :  10.1016/j.renene.2017.11.032

来源: Elsevier

【 摘 要 】

Cross-ventilation using rooftop wind-catchers is very complex as it is influenced by a wide range of interrelated factors including aerodynamic characteristics of the wind catcher, approach-flow conditions and building geometry. Earlier studies on wind-driven cross-ventilation in buildings have shown the significant impact of the geometry and position of openings on the flow and ventilation performance. However, this has not yet been investigated for cross-ventilation using wind catchers. This paper, therefore, presents a detailed evaluation of the impact of the outlet openings on the ventilation performance of a single-zone isolated building with a wind catcher. The evaluation is based on three ventilation performance indicators: (i) induced airflow rate, (ii) age of air, and (iii) air change efficiency. High-resolution coupled 3D steady RANS CFD simulations Of cross-ventilation are performed for different sizes and types of outlet openings. The CFD simulations are validated based on wind-tunnel measurements. The results show that using outlet openings very close to the wind catcher will not increase the induced airflow, while it leads to a considerable reduction in the indoor air quality. A combination of one-sided wind-catcher and window is superior, while the use of two-sided wind-catchers leads to the lowest indoor air quality and air change efficiency. (C) 2017 The Authors. Published by Elsevier Ltd.

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