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Impact of Green Roofs on Energy Demand for Cooling in Egyptian Buildings

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  • Ayman Ragab

    (Department of Architecture, Faculty of Engineering, Aswan University, Aswan 81542, Egypt)

  • Ahmed Abdelrady

    (Department of Water Management, Delft University of Technology, 2600 GA Delft, The Netherlands)

Abstract

Energy consumption for cooling purposes has increased significantly in recent years, mainly due to population growth, urbanization, and climate change consequences. The situation can be mitigated by passive climate solutions to reduce energy consumption in buildings. This study investigated the effectiveness of the green roof concept in reducing energy demand for cooling in different climatic regions. The impact of several types of green roofing of varying thermal conductivity and soil depth on energy consumption for cooling school buildings in Egypt was examined. In a co-simulation approach, the efficiency of the proposed green roof types was evaluated using the Design-Builder software, and a cost analysis was performed for the best options. The results showed that the proposed green roof types saved between 31.61 and 39.74% of energy, on average. A green roof featuring a roof soil depth of 0.1 m and 0.9 W/m-K thermal conductivity exhibited higher efficiency in reducing energy than the other options tested. The decrease in air temperature due to green roofs in hot arid areas, which exceeded an average of 4 °C, was greater than that in other regions that were not as hot. In conclusion, green roofs were shown to be efficient in reducing energy consumption as compared with traditional roofs, especially in hot arid climates.

Suggested Citation

  • Ayman Ragab & Ahmed Abdelrady, 2020. "Impact of Green Roofs on Energy Demand for Cooling in Egyptian Buildings," Sustainability, MDPI, vol. 12(14), pages 1-13, July.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:14:p:5729-:d:385383
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    References listed on IDEAS

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    3. Hiba Najini & Mutasim Nour & Sulaiman Al-Zuhair & Fadi Ghaith, 2020. "Techno-Economic Analysis of Green Building Codes in United Arab Emirates Based on a Case Study Office Building," Sustainability, MDPI, vol. 12(21), pages 1-22, October.
    4. Ahmed Abdelrady & Mohamed Hssan Hassan Abdelhafez & Ayman Ragab, 2021. "Use of Insulation Based on Nanomaterials to Improve Energy Efficiency of Residential Buildings in a Hot Desert Climate," Sustainability, MDPI, vol. 13(9), pages 1-17, May.
    5. Mohamed Hssan Hassan Abdelhafez & Fatmaelzhraa Altaf & Mohammad Alshenaifi & Omar Hamdy & Ayman Ragab, 2022. "Achieving Effective Thermal Performance of Street Canyons in Various Climatic Zones," Sustainability, MDPI, vol. 14(17), pages 1-21, August.
    6. Abdul Mujeebu, Muhammad & Bano, Farheen, 2022. "Integration of passive energy conservation measures in a detached residential building design in warm humid climate," Energy, Elsevier, vol. 255(C).

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