Author : Algendy Shaker Algendy and Maha F. Anbar

Global warming and climate change are definitely bringing disasters to the mankind according to all the recent studies. Building sector is a great contributor to energy consumption and greenhouse gas emissions which make it a crucial matter to consider energy efficiency related to building sector. Considering energy efficiency in buildings and sustainability factors will result in significant energy reduction, environmental saving and greenhouse gas emissions reduction. The building envelope influence the building energy demand greatly, windows are important components of any building envelope contributing in daylight mainly and thermal transfer partially. This paper focuses on the main three climatic regions in Egypt covering almost all of the country in order to maintain the energy efficiency concepts in the entire residential sector allover Egypt. The paper studies Cairo and delta climatic zone, northern coast and southern Egypt climatic zone. The paper highlights the best orientation in each climatic zone. The paper studies the optimum window to wall ratio in all the orientations from energy efficiency perspective as well. The studied orientations are divided into steps of 30°. The paper holds an applied study using designbuilder energy simulation software.

Keywords: Energy Efficiency, Windows, Openings, window to wall ratio, designbuilder, energy simulation, Environmental Engineering

Article published in International Journal of Current Engineering and Technology, Vol.7, No.1 (Feb-2017)