Reassessment of fenestration characteristics for residential buildings in hot climates: energy and economic analysis |
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Authors: | Ali ALAJMI Hosny ABOU-ZIYAN Hamad H Al-MUTAIRI |
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Affiliation: | 1. Mechanical Engineering Department, College of Technological Studies, PAAET, Kuwait2. Mechanical Engineering Department, College of Technological Studies, PAAET, Kuwait; Mechanical Power Engineering Department, Faculty of Engineering, Helwan University, Cairo, Egypt |
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Abstract: | This paper attempts to resolve the reported contradiction in the literature about the characteristics of high-performance/cost-effective fenestration of residential buildings, particularly in hot climates. The considered issues are the window glazing property (ten commercial glazing types), facade orientation (four main orientations), window-to-wall ratio (WWR) (0.2–0.8), and solar shading overhangs and side-fins (nine shading conditions). The results of the simulated runs reveal that the glazing quality has a superior effect over the other fenestration parameters and controls their effect on the energy consumption of residential buildings. Thus, using low-performance windows on buildings yields larger effects of WWR, facade orientation, and solar shading than high-performance windows. As the WWR increases from 0.2 to 0.8, the building energy consumption using the low-performance window increases 6.46 times than that using the high-performance window. The best facade orientation is changed from north to south according to the glazing properties. In addition, the solar shading need is correlated as a function of a window-glazing property and WWR. The cost analysis shows that the high-performance windows without solar shading are cost-effective as they have the largest net present cost compared to low-performance windows with or without solar shading. Accordingly, replacing low-performance windows with high-performance ones, in an existing residential building, saves about 12.7 MWh of electricity and 11.05 tons of CO2 annually. |
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Keywords: | parametric analysis high-performance window window-to-wall ratio (WWR) facade orientation solar shading cost analysis |
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