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Reassessment of fenestration characteristics for residential buildings in hot climates: energy and economic analysis

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Frontiers in Energy 2022年第4期16卷 629-650页

作者： Ali ALAJMI Hosny ABOU-ZIYAN Hamad H.Al-MUTAIRI Mechanical Engineering Department College of Technological StudiesPAAETKuwait Mechanical Power Engineering Department Faculty of EngineeringHelwan UniversityCairoEgypt

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 *** 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 ***,using low-performance windows on buildings yields larger effects of WWR,facade orientation,and solar shading than high-performance *** 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 highperformance *** best facade orientation is changed from north to south according to the glazing *** addition,the solar shading need is correlated as a function of a window-glazing property and *** cost analysis shows that the high-performance windows without solar shading are cost-effective as they have the largest net present cost compared to lowperformance windows with or without solar ***,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 CO_(2) annually.

关键词： parametric analysis high-performance window window-to-wall ratio(WWR) facade orientation solar shading cost analysis

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Thermal comfort in winter incorporating solar radiation effects at high altitudes and performance of improved passive solar design-Case of Lhasa

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Building Simulation 2021年第6期14卷 1633-1650页

作者： Lingjiang Huang Jian Kang Department of Architecture Wuhan UniversityWuhan 430072China UCL Institute for Environmental Design and Engineering The BartlettUniversity College London(UCL)London WC1H 0NNUK

The solar incidence on an indoor environment and its occupants has significant impacts on indoor thermal *** can bring favorable passive solar heating and can result in undesired overheating(even in winter).This problem becomes more critical for high altitudes with high intensity of solar irradiance,while received limited *** this study,we explored the specific overheating and rising thermal discomfort in winter in Lhasa as a typical location of a cold climate at high ***,we evaluated the thermal comfort incorporating solar radiation effect in winter by field ***,we investigated local occupant adaptive responses(considering the impact of direct solar irradiance).This was followed by a simulation study of assessment of annual based thermal comfort and the effect on energy-saving potential by current solar ***,we discussed winter shading design for high altitudes for both solar shading and passive solar use at high altitudes,and evaluated thermal mass shading with solar louvers in terms of indoor environment *** results reveal that considerable indoor overheating occurs during the whole winter season instead of summer in Lhasa,with over two-thirds of daytime beyond the comfort ***,various adaptive behaviors are adopted by occupants in response to overheating due to the solar ***,it is found that the energy-saving potential might be overestimated by 1.9 times with current window to wall ratio requirements in local design standards and building codes due to the thermal adaption by drawing *** developed thermal mass shading is efficient in achieving an improved indoor thermal environment by reducing overheating time to an average of 62.2% during the winter and a corresponding increase of comfort time.

关键词： thermal comfort overheating passive solar design high altitude Tibet solar shading

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