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

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  • Montazeri, H.
  • Montazeri, F.

Abstract

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.

Suggested Citation

  • Montazeri, H. & Montazeri, F., 2018. "CFD simulation of cross-ventilation in buildings using rooftop wind-catchers: Impact of outlet openings," Renewable Energy, Elsevier, vol. 118(C), pages 502-520.
    • Handle: RePEc:eee:renene:v:118:y:2018:i:c:p:502-520
    DOI: 10.1016/j.renene.2017.11.032
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    References listed on IDEAS

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    Cited by:

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    2. Payam Nejat & Fatemeh Jomehzadeh & Hasanen Mohammed Hussen & John Kaiser Calautit & Muhd Zaimi Abd Majid, 2018. "Application of Wind as a Renewable Energy Source for Passive Cooling through Windcatchers Integrated with Wing Walls," Energies, MDPI, vol. 11(10), pages 1-23, September.
    3. Alsailani, M. & Montazeri, H. & Rezaeiha, A., 2021. "Towards optimal aerodynamic design of wind catchers: Impact of geometrical characteristics," Renewable Energy, Elsevier, vol. 168(C), pages 1344-1363.
    4. Javanroodi, Kavan & Mahdavinejad, Mohammadjavad & Nik, Vahid M., 2018. "Impacts of urban morphology on reducing cooling load and increasing ventilation potential in hot-arid climate," Applied Energy, Elsevier, vol. 231(C), pages 714-746.
    5. Liu, Miaomiao & Nejat, Payam & Cao, Pinlu & Jimenez-Bescos, Carlos & Calautit, John Kaiser, 2024. "A critical review of windcatcher ventilation: Micro-environment, techno-economics, and commercialisation," Renewable and Sustainable Energy Reviews, Elsevier, vol. 191(C).
    6. Kang, Daeho & Strand, Richard K., 2018. "Performance control of a spray passive down-draft evaporative cooling system," Applied Energy, Elsevier, vol. 222(C), pages 915-931.
    7. Juan, Yu-Hsuan & Rezaeiha, Abdolrahim & Montazeri, Hamid & Blocken, Bert & Wen, Chih-Yung & Yang, An-Shik, 2022. "CFD assessment of wind energy potential for generic high-rise buildings in close proximity: Impact of building arrangement and height," Applied Energy, Elsevier, vol. 321(C).
    8. Ashraf Balabel & Mamdooh Alwetaishi & Wageeh A. El-Askary & Hamza Fawzy, 2021. "Numerical Study on Natural Ventilation Characteristics of a Partial-Cylinder Opening for One-Sided-Windcatcher of Variable Air-Feeding Orientations in Taif, Saudi Arabia," Sustainability, MDPI, vol. 13(20), pages 1-20, October.
    9. Rezaeiha, Abdolrahim & Montazeri, Hamid & Blocken, Bert, 2019. "On the accuracy of turbulence models for CFD simulations of vertical axis wind turbines," Energy, Elsevier, vol. 180(C), pages 838-857.
    10. Nina Szczepanik-Scislo & Jacek Schnotale, 2020. "An Air Terminal Device with a Changing Geometry to Improve Indoor Air Quality for VAV Ventilation Systems," Energies, MDPI, vol. 13(18), pages 1-20, September.
    11. Rezaeiha, Abdolrahim & Montazeri, Hamid & Blocken, Bert, 2018. "Towards optimal aerodynamic design of vertical axis wind turbines: Impact of solidity and number of blades," Energy, Elsevier, vol. 165(PB), pages 1129-1148.
    12. Ahmed, Tariq & Kumar, Prashant & Mottet, Laetitia, 2021. "Natural ventilation in warm climates: The challenges of thermal comfort, heatwave resilience and indoor air quality," Renewable and Sustainable Energy Reviews, Elsevier, vol. 138(C).

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