External perforated Solar Screens for daylighting in residential desert buildings: Identification of minimum perforation percentages

Sherif, Ahmed; Sabry, Hanan; Rakha, Tarek

doi:10.1016/j.solener.2012.02.029

Cited by 50 publications

(18 citation statements)

References 12 publications

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“…To better investigate the efficiency of daylight in educational systems during the year and to analyze and examine light shelf states more, this kind of analysis was used. This calculation method was also used in valid research works [43,44].…”

Section: The Quality Of Daylight Simulation Results Analysismentioning

confidence: 99%

Investigating the Influence of Light Shelf Geometry Parameters on Daylight Performance and Visual Comfort, a Case Study of Educational Space in Tehran, Iran

Moazzeni

Ghiabaklou

2016

Buildings

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Daylight can be considered as one of the most important principles of sustainable architecture. It is unfortunate that this is neglected by designers in Tehran, a city that benefits from a significant amount of daylight and many clear sunny days during the year. Using a daylight controller system increases space natural light quality and decreases building lighting consumption by 60%. It also affects building thermal behavior, because most of them operate as shading. The light shelf is one of the passive systems for controlling daylight, mostly used with shading and installed in the upper half of the windows above eye level. The influence of light shelf parameters, such as its dimensions, shelf rotation angle and orientation on daylight efficiency and visual comfort in educational spaces is investigated in this article. Daylight simulation software and annual analysis based on climate information during space occupation hours were used. The results show that light shelf dimensions, as well as different orientations, especially in southern part, are influential in the distribution of natural light and visual comfort. At the southern orientation, increased light shelf dimensions result in an increase of the area of the work plane with suitable daylight levels by 2%-40% and a significant decrease in disturbing and intolerable glare hours.

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Section: The Quality Of Daylight Simulation Results Analysismentioning

confidence: 99%

Investigating the Influence of Light Shelf Geometry Parameters on Daylight Performance and Visual Comfort, a Case Study of Educational Space in Tehran, Iran

Moazzeni

Ghiabaklou

2016

Buildings

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“…A perforated solar screen which has been employed in a desert climate, which resembles the high-altitude climate in its clear skies and high intensity of solar radiation, has been investigated in terms of its reduction to the cooling load [17]. This shading device proved to be effective at improving natural daylighting while controlling solar access in certain optimized configurations [18,19]. A further study on the optimized design of perforated solar facades was conducted with a focus on the integration of daylighting, the control of solar radiation and energy performance [20].…”

Section: Design Approach To Winter Solar Shadingmentioning

confidence: 99%

“…Daysim is a Radiance-based daylighting analysis tool for the calculation of annual indoor illuminance profiles based on a weather climate file [26]. Daysim has also been validated and widely employed in daylighting studies [18,19,29]. The simulation was performed in Lhasa (29.6° N-91.1° E), Tibet, which is a typical location at a high altitude of 3600 m, with a cold climate and a high intensity of solar irradiance.…”

Section: Simulation Setupmentioning

confidence: 99%

Perforated Thermal Mass Shading: An Approach to Winter Solar Shading and Energy, Shading and Daylighting Performance

Huang

Zhao

2017

Energies

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Direct solar irradiance may cause thermal discomfort, even in winter when the ambient temperature is low and especially for high-altitude locations with a high intensity of solar radiation. Thus winter solar shading might be required and, if used, must achieve a balance between the prevention of the transmittance of solar irradiance, the utilization of passive solar heat and the supply of adequate natural daylighting. These considerations render conventional solutions of solar shading inapplicable in the winter. In this paper, a novel approach to perforated thermal mass shading for winter is reported and examined. The impacts of the perforated percentage and the opening positions of this shading device on energy, shading and daylighting performance were assessed for south-and west-facing orientations. A range of perforated percentages and vertical and horizontal positions were tested using simulations by Energyplus and Daysim. Our results indicate that the proposed perforated thermal mass shading is efficient for the integrated performance of shading, daylighting and energy savings in the south-facing orientation, while it achieves acceptable performance in shading and daylighting in the west-facing orientation for a high-altitude cold climate.

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“…It is therefore proposed to prepare nanofibers of the same material on large grids substrates, while decreasing the spinning distance to ensure that the residual solvent bonds and welds the grids and the nanofibers. At the same time, multiple functions of nanofiber such as light transmission, anti‐mite, and hydrophobic could be achieved by adjusting preparation technology …”

Section: Introductionmentioning

confidence: 99%

High performance anti‐smog window screens via electrospun nanofibers

Zhang

et al. 2019

J of Applied Polymer Sci

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Scientific studies clearly link air pollution with adverse effects on human health, which includes reduction of cognitive abilities. Hence quality indoor air is essential in rapidly urbanizing societies. The aim of this research work is to develop anti-smog, air permeable, water-proof, and transparent window screens suitable for natural ventilation. For this purpose, we bonded polyethylene terephthalate (PET) nanofibers on PET grids by electrospinning method with relative near spinning distance. During the process, the incomplete solvent evaporation of the collected jet could enhance the bonding of the PET nanofibers to the PET grids. The experimental results showed that the PET nanofibers had a thick deposition at the yarn edge of the PET grids, which also increased the bonding area between the PET nanofibers and the grids. At the same time, PET nanofibers had a thin deposition between the gaps of the PET grids, which not only increased the number of micron-nano-sized holes but also increased the light transmittance of the window screen. After filtration test for 5 h, the PM2.5 filtration efficiency of this anti-smog window screen was high as to 87% and the PET nanofiber window screen still maintained high light transmittance and superhydrophobicity. This research work is a promising way to prepare anti-smog window screens.

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External perforated Solar Screens for daylighting in residential desert buildings: Identification of minimum perforation percentages

Cited by 50 publications

References 12 publications

Investigating the Influence of Light Shelf Geometry Parameters on Daylight Performance and Visual Comfort, a Case Study of Educational Space in Tehran, Iran

Investigating the Influence of Light Shelf Geometry Parameters on Daylight Performance and Visual Comfort, a Case Study of Educational Space in Tehran, Iran

Perforated Thermal Mass Shading: An Approach to Winter Solar Shading and Energy, Shading and Daylighting Performance

High performance anti‐smog window screens via electrospun nanofibers

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