Abstract
The windows are considered the most sensitive part against external conditions in the building envelope. A suitable window selection reduces the energy requirements of a given building in a given climate. This article presents a parametric study of annual heating and cooling requirements for a commercial building, depending on the type and size of glazing in different climatic regions in Morocco. The study was carried out for six climatic zones: Agadir, Errachidia, Fez, Ifrane, Marrakech, and Tangier. Seven types of windows were studied, including single-glazing, double-glazing, and triple-glazing with inert gases in the cavity. The results obtained using the TRNSYS software show that the energy savings depend on the window type and size and also on the climatic conditions of the place. It is demonstrated that with triple-glazing with xenon, energy savings can reach more than 90% with a window/wall ratio of 90% in all climatic zones. Related payback periods were found to be between 4.4 and 7 years. Furthermore, the optimization of windows ratio and type can induce significant energy savings, but strongly rely on the investment cost of glazing materials.
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