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Assessment of green roof benefits on buildings’ energy-saving by cooling outdoor spaces in different urban densities in arid cities

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  • Aboelata, Amir

Abstract

Over the last twenty years, Cairo experienced a great rise in temperature by 4–5 K due to the high urban density and lack of vegetation. These factors led to increased air conditioning and electricity usage. This study therefore seeks to evaluate the effect of green roofs on reducing outdoor air temperature and lowering buildings’ cooling energy demand in different urban densities. Group A consisted of the same aspect ratio areas H/W = 1 and different building heights of 12 m, 18 m, and 30 m. Group B contained areas of the same building heights (12 m) and different aspect ratios of H/W = 1, 2, and 3. ENVI-met v.4.4.4 was used to study each area by simulating the reference case and two scenarios: extensive and intensive green roofs. Then, a DesignBuilder model was used to calculate the buildings’ energy demand. This study found that intensive green roofs achieve the maximum reduction in air temperature and buildings’ cooling energy. However, the economic aspect favors using extensive green roofs as they were able to reduce air temperature and buildings’ cooling energy in Group A by 0.1–0.5 K and 1.3–3.2% and in Group B by 0.1–1.7 K and 3.2–13.3%.

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  • Aboelata, Amir, 2021. "Assessment of green roof benefits on buildings’ energy-saving by cooling outdoor spaces in different urban densities in arid cities," Energy, Elsevier, vol. 219(C).
    • Handle: RePEc:eee:energy:v:219:y:2021:i:c:s0360544220326219
    DOI: 10.1016/j.energy.2020.119514
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    References listed on IDEAS

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    Cited by:

    1. Bevilacqua, Piero, 2021. "The effectiveness of green roofs in reducing building energy consumptions across different climates. A summary of literature results," Renewable and Sustainable Energy Reviews, Elsevier, vol. 151(C).
    2. Battista, Gabriele & de Lieto Vollaro, Emanuele & Ocłoń, Paweł & Vallati, Andrea, 2021. "Effect of mutual radiative exchange between the surfaces of a street canyon on the building thermal energy demand," Energy, Elsevier, vol. 226(C).
    3. Mihalakakou, Giouli & Souliotis, Manolis & Papadaki, Maria & Menounou, Penelope & Dimopoulos, Panayotis & Kolokotsa, Dionysia & Paravantis, John A. & Tsangrassoulis, Aris & Panaras, Giorgos & Giannako, 2023. "Green roofs as a nature-based solution for improving urban sustainability: Progress and perspectives," Renewable and Sustainable Energy Reviews, Elsevier, vol. 180(C).
    4. Hai-Ying Liu & Marion Jay & Xianwen Chen, 2021. "The Role of Nature-Based Solutions for Improving Environmental Quality, Health and Well-Being," Sustainability, MDPI, vol. 13(19), pages 1-56, October.
    5. Gianfranco Rizzo & Laura Cirrincione & Maria La Gennusa & Giorgia Peri & Gianluca Scaccianoce, 2023. "Green Roofs’ End of Life: A Literature Review," Energies, MDPI, vol. 16(2), pages 1-16, January.
    6. Dong, Xin & He, Bao-Jie, 2023. "A standardized assessment framework for green roof decarbonization: A review of embodied carbon, carbon sequestration, bioenergy supply, and operational carbon scenarios," Renewable and Sustainable Energy Reviews, Elsevier, vol. 182(C).

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