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Outdoor airflow analysis and potential for passive cooling in the modern urban context of Dubai

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  • Al-Sallal, Khaled A.
  • Al-Rais, Laila

Abstract

The main aim of the study is to investigate passive cooling performance in modern urban contexts in the hot humid climate of the city of Dubai. Three cases were simulated for Al-Mankhool area with laminar and turbulent windflow depending on Computational Fluid Dynamics (CFD) methodology. The laminar case was firstly run to study the general wind behaviour around buildings and at the pedestrian level. The other two cases were turbulence modelling in both winter and summer seasons. The results were merely discussed and analysed in terms of passive cooling via natural ventilation and its impact on human comfort depending on the ASHRAE adaptive model. In the modern urban pattern, wind flow decreased when hitting the buildings, funnelled by the wider street canyons, then increased once again when going to the free stream. Wind velocities were more comfortable in wider street canyons with aspect ratio, AR = 1.75. It was noticed that wind speed increased substantially in open spaces such as parking areas and undeveloped plots reaching its maximum values of 4.55 m/s in the summer and 5.06 m/s in the winter. Where as in the longer street canyons bounded by building blocks on opposite sides, the wind velocity remained stable at low values (0.51 m/s in the winter versus 1.52 m/s in the summer) with limited fluctuation till it joined the free stream again.

Suggested Citation

  • Al-Sallal, Khaled A. & Al-Rais, Laila, 2012. "Outdoor airflow analysis and potential for passive cooling in the modern urban context of Dubai," Renewable Energy, Elsevier, vol. 38(1), pages 40-49.
    • Handle: RePEc:eee:renene:v:38:y:2012:i:1:p:40-49
    DOI: 10.1016/j.renene.2011.06.046
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    References listed on IDEAS

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    1. Bourbia, F & Awbi, H.B, 2004. "Building cluster and shading in urban canyon for hot dry climate," Renewable Energy, Elsevier, vol. 29(2), pages 249-262.
    2. Al-Sallal, Khaled A. & Al-Rais, Laila, 2011. "Outdoor airflow analysis and potential for passive cooling in the traditional urban context of Dubai," Renewable Energy, Elsevier, vol. 36(9), pages 2494-2501.
    3. Bourbia, F. & Boucheriba, F., 2010. "Impact of street design on urban microclimate for semi arid climate (Constantine)," Renewable Energy, Elsevier, vol. 35(2), pages 343-347.
    4. Bourbia, F & Awbi, H.B, 2004. "Building cluster and shading in urban canyon for hot dry climate," Renewable Energy, Elsevier, vol. 29(2), pages 291-301.
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    Citations

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    Cited by:

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    2. Bouketta, S. & Bouchahm, Y., 2020. "Numerical evaluation of urban geometry's control of wind movements in outdoor spaces during winter period. Case of Mediterranean climate," Renewable Energy, Elsevier, vol. 146(C), pages 1062-1069.
    3. Costanzo, Vincenzo & Yao, Runming & Xu, Tiantian & Xiong, Jie & Zhang, Qiulei & Li, Baizhan, 2019. "Natural ventilation potential for residential buildings in a densely built-up and highly polluted environment. A case study," Renewable Energy, Elsevier, vol. 138(C), pages 340-353.
    4. Kim, Se Woong & Brown, Robert D., 2023. "Development of a micro-scale heat island (MHI) model to assess the thermal environment in urban street canyons," Renewable and Sustainable Energy Reviews, Elsevier, vol. 184(C).
    5. Toparlar, Y. & Blocken, B. & Maiheu, B. & van Heijst, G.J.F., 2017. "A review on the CFD analysis of urban microclimate," Renewable and Sustainable Energy Reviews, Elsevier, vol. 80(C), pages 1613-1640.
    6. Jomehzadeh, Fatemeh & Nejat, Payam & Calautit, John Kaiser & Yusof, Mohd Badruddin Mohd & Zaki, Sheikh Ahmad & Hughes, Ben Richard & Yazid, Muhammad Noor Afiq Witri Muhammad, 2017. "A review on windcatcher for passive cooling and natural ventilation in buildings, Part 1: Indoor air quality and thermal comfort assessment," Renewable and Sustainable Energy Reviews, Elsevier, vol. 70(C), pages 736-756.

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