Optimal sun-shading design for enhanced daylight illumination of subtropical classrooms

Ho, Ming‐Chih; Chiang, Che‐Ming; Chou, Po-Cheng; Chang, Kuei-Feng; Lee, Chia-Yen

doi:10.1016/j.enbuild.2008.04.012

Cited by 49 publications

(42 citation statements)

References 13 publications

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“…On the other hand, Ho et al [27] analyzed 25 different geometrical configurations for light shelves, that may be categorized in: (i) single-shading (one external shelf), (ii) twin-shading (internal and external shelves), (iii) double-layered shading (as for the twin-shading scheme but with the addition of a lower external and mostly specular shelf) and (iv) double-layered shading with a single vertical element on the upper exterior shelf.…”

Section: Re-directing Systemsmentioning

confidence: 99%

“…Light shelves [27,28,31,37,42,45,47,50] If coupled with clerestory windows, they are expected to increase the DF in the room as well as its uniformity under sunny sky conditions. Under different operational conditions, poor performance is usually achieved Light pipes [25] A light reflector in the collecting dome can increase illuminance on cloudy days up to 30%…”

Section: Re-directing Systemsmentioning

confidence: 99%

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A Review of Daylighting Strategies in Schools: State of the Art and Expected Future Trends

2017

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Abstract:The study of daylight conditions within educational buildings has been a topic of interest since the nineteenth century in western countries, and European ones in particular. Although it has been argued that providing a view outside-or even using daylight instead of more stable and manageable artificial light-could reduce students' performance without providing a pleasant and healthy environment, nowadays it seems that a large consensus upon the need to design well daylit spaces is being reached. This paper reviews how the research community has tackled the task of understanding and solving the complex relationships amongst local climate, users' needs and design constraints in school buildings by showing the different approaches used and technological solutions suggested. The reported case studies, based either on experimental measurements or on simulations, highlight the need of a comprehensive approach to the topic to fully understand the non-trivial requirements of a daylit educational environment.

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Section: Re-directing Systemsmentioning

confidence: 99%

Section: Re-directing Systemsmentioning

confidence: 99%

A Review of Daylighting Strategies in Schools: State of the Art and Expected Future Trends

2017

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“…This work includes previous review and empirical works. Attention was equally given to the methodologies and context on the work.. Table 1 shows several daylighting performance criteria such as work plane illuminance, surface illuminance, illuminance distribution uniformity , daylight factor, daylight ratio, glare analysis among others as observed by scholars such as (19,21,22,32,(34)(35)(36)(37)(38)(39)(40)(41)(42)(43)(44)(45)(46)(47)(48)(49)(50)(51)(52). In Table 2, Freewan, Shao (53) used the different geometry of ceiling while the light shelf was made horizontal.…”

Section: Methodology / Materialsmentioning

confidence: 99%

“…Higher Uniformity Ratio indicates better daylight distribution (40,60). Uniformity ratio of 0.1 is poor daylight distribution (19).…”

Section: Parameter For Daylighting Performancementioning

confidence: 99%

Light Shelf as a Daylighting System in a Tropical Climate Office Space

Abimaje¹,

Joshua²,

Kandar³

et al. 2018

IJET

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Daylighting is a passive design strategy for lighting office spaces given the fact that offices operate within daytime, usually between 8:00 am to 5:00 pm which corresponds to the period of daylight availability. Daylight is abundant in the tropics, free and has no negative impact on the environment. It has positive physiological and psychological effect on the man as well as good colour rendering. Ironically, despite the abundant availability and the merits of daylighting especially in the tropics, it is not fully utilized. A light shelf is one of the innovative daylighting systems that can be employed to improve office spaces daylighting performance. Therefore, the focus of this study is the application of light shelf as a daylighting system in government offices in Malaysia. This study was carried out through literature search on thirteen disciplines. The disciplines were building and environment, energy, and building, renewable and sustainable energy, energy conservation in Building, lighting research and technology, energy conservation and Management, Solar energy, renewable energy, indoor and built environment, energy policy, energy and buildings, renewable energy, and applied energy. Data were obtained from Science Direct, Web of Science, Scopus and Conference Proceedings. This was done by typing in keywords such as daylighting, light shelf, office spaces, visual performance, tropical climate, and Malaysia. The review was from 1986 to 2016 to cover the length and breadth of the study area for the past 30 years. This work includes previous review and empirical works. Attention was equally given to the methodologies and context of the work. The result of this study showed the poor daylighting performance of government office spaces in Malaysia. The daylighting in these offices is either too low as a result of the use of excessive external shading devices to reduce interior heat gain or too high due to over glazed wall for aesthetics and daylighting. Consequent upon these is inadequate daylighting illuminance, non-uniform illuminance distribution, and glare. This brings about visual discomfort. Also, the study revealed that light shelf as an innovative daylighting lighting system could improve the daylighting performance of these office spaces. The effectiveness of light shelf depends on the latitude, reflectance of light shelf material, the angle of inclination, its depth, mounting position among others. However, there exists little work on the effect of the depth of light shelf and the variation of its distance from the ceiling on the daylight performance of government office spaces in Malaysia. This paper, therefore, recommends investigation on the effect of the depth of light shelf and the variation of its distance from the ceiling on daylighting performance of government office spaces in Malaysia.

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“…The studies in the literature have focussed on a specific envelope component, issues of glazing applications in building fac¸ade connected with problems like overheating, overcooling or glazing (Manz and Menti, 2012;Stegou et al, 2007;Ho et al, 2008;Gueymard and duPont, 2009;Ramos and Ghisi, 2010). Jenkins et al (2009) focussed on the overheating problems in school buildings.…”

Section: Introductionmentioning

confidence: 99%

An investigation on daylighting performance in educational institutions

İnan

2013

Structural Survey

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Purpose -The purpose of this research is to investigate natural illumination properties of one of the classrooms in the School of Architecture at Izmir Institute of Technology, located in Turkey, which is the northern hemisphere. Design/methodology/approach -In this study, the definitions of the basic terms in daylighting, such as daylight factor, illuminance, glazing ratio, are given first. Then, a luxmeter and a lighting simulation software, Velux, are used in order to calculate variable lighting factors during daytime, at different storeys, at different directions, for the classes. Velux is a proprietary software and it enables natural lighting analysis practically. Findings -Chosen classrooms are examined regarding their having sufficient natural illumination. The height of windows from the floor is changed, and the resultant effects on natural lighting in the classrooms are determined by using the lighting simulation program, Velux. The study shows that daylight factor and illumination near the window decreases as the height of the window above the floor increases. However, the illumination increases away from the window, giving greater uniformity to the lighting. At the same time, the usable depth of the classroom increases. The tall and narrow windows bring the daylight near themselves. Social implications -Practical window design decisions can help architects to provide effective and healthy natural lighting for interiors. Originality/value -Adjustment of the dimensions of the windows is important in order to balance the energy consumption of buildings. This study investigates natural lighting depending on both experimental measurements and simulation software, Velux.

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Optimal sun-shading design for enhanced daylight illumination of subtropical classrooms

Cited by 49 publications

References 13 publications

A Review of Daylighting Strategies in Schools: State of the Art and Expected Future Trends

A Review of Daylighting Strategies in Schools: State of the Art and Expected Future Trends

Light Shelf as a Daylighting System in a Tropical Climate Office Space

An investigation on daylighting performance in educational institutions

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