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Cairo University (2012)

The future of green-roofs in Egypt : the economical and environmental benefits when installing green-roof in a residential building in Cairo

Ahmed Elsayed Saad Abdelsalam

Titre : The future of green-roofs in Egypt : the economical and environmental benefits when installing green-roof in a residential building in Cairo

Auteur : Ahmed Elsayed Saad Abdelsalam

Etablissement de soutenance : Cairo University

Grade : Master of Science (MS) 2012

Résumé
Green-roofs are becoming a popular breathing roofing alternative to traditional roofing systems. Green-roofs were mentioned as an ecological-economical solution ; however, limited work has been carried out on the potential of green-roofs to in arid climates. This thesis represents the potential of green-roofs in saving electricity consumption and reducing annual CO2 emissions in arid climates. The model accounts for energy savings, structural considerations and other variables. Detailed thermal simulations for various configurations of green roofs are performed to assess energy savings using DesignBuilder. Experiments are performed on a two story hypothetical residential building in Egypt, with a base case control that uses a traditional roof which meets standard model energy codes. A specific local climatic zone (Greater Cairo and Delta) was simulated while changing the thickness of the green-roof soil, the conductivity of the green roof, and building aspect ratio. Costs for green-roof saving potentials were estimated according to the Egyptian electricity consumption calculator, other parameters as retrofit potential, and structure allowances to withhold the required layers with different thicknesses. The results demonstrate the economic benefits of using green-roofs under different design situations and provide guidance for the selection and design of green-roof systems in similar climates. Savings varied from 13% to 39% compared to traditional and un-isolated roofs respectively.

Mots clés : Green-roofs, Energy Consumption, DesignBuilder-Ecoroof, Building Retrofit, Pollution, Ecology, Green Architecture, Green Construction.

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Page publiée le 23 janvier 2016, mise à jour le 19 juin 2018