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Outdoor airflow analysis and potential for passive cooling in the traditional 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 traditional urban contexts in the hot humid climate of the city of Dubai. Three cases were simulated for Al-Ras area with laminar and turbulent wind flow depending on Computational Fluid Dynamics (CFD) methodology. The laminar case was firstly run to study the general wind behavior around buildings and at the pedestrian level. The other two cases were turbulence modeling in both winter and summer seasons. The results were merely discussed and analyzed in terms of passive cooling via natural ventilation and its impact on human comfort. Narrow street canyons (4 m and less) can accelerate wind speed passing through it, resulting in a better passive cooling performance but sometimes in creating eddies if there are lots of bending angles. When the wind speed is higher (5 m/s), wind can reach deeper inside the traditional narrow streets providing better potential for thermal comfort. Most locations (49–57% of the studied area) inside the traditional urban context (street canyons aspect ratio, AR = 2–0.67) have wind speeds that range from light breeze to gentle breeze (according to Beaufort scale); which has the potential to provide natural cooling with around 5–8.5 °C lower temperature comfort sensation with basic assumption of 1.3 metabolic rate (MET) and 0.4 insulating value of summer clothing (CLO).

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:36:y:2011:i:9:p:2494-2501
    DOI: 10.1016/j.renene.2011.01.035
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    References listed on IDEAS

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    1. Awbi, Hazim B., 1998. "Chapter 7--Ventilation," Renewable and Sustainable Energy Reviews, Elsevier, vol. 2(1-2), pages 157-188, June.
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    Cited by:

    1. Kim, Se Woong & Brown, Robert D., 2021. "Urban heat island (UHI) variations within a city boundary: A systematic literature review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 148(C).
    2. 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.
    3. 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.
    4. 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.
    5. 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.
    6. Rosso, Federica & Golasi, Iacopo & Castaldo, Veronica Lucia & Piselli, Cristina & Pisello, Anna Laura & Salata, Ferdinando & Ferrero, Marco & Cotana, Franco & de Lieto Vollaro, Andrea, 2018. "On the impact of innovative materials on outdoor thermal comfort of pedestrians in historical urban canyons," Renewable Energy, Elsevier, vol. 118(C), pages 825-839.

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