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 win-dows 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.

Ali ALAJMI;Hosny ABOU-ZIYAN;Hamad H.Al-MUTAIRI

Mechanical Engineering Department,College of Technological Studies,PAAET,Kuwait;Mechanical Power Engineering Department,Faculty of Engineering,Helwan University,Cairo,Egypt

能源前沿

[1]Ali ALAJMI;Hosny ABOU-ZIYAN;Hamad H.Al-MUTAIRI-.Reassessment of fenestration characteristics for residential buildings in hot climates:energy and economic analysis)[J].能源前沿,2022(04):629-650

Reassessment,glazing,facade,WWR,overhangs

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