A simulation-aided approach in examining the viability of passive daylighting techniques on inclined windows

Teo, Ya Hui; Yap, Jun Hong; An, Hui; Xie, Nenggang; Chang, Jie; Yu, S. C. M.; Poon, Wai Ching; Zhang, Limao; Cheong, Kang Hao

doi:10.1016/j.enbuild.2022.112739

Cited by 8 publications

(3 citation statements)

References 51 publications

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“…A light shelf is a natural lighting system that takes natural light entering a room through a daylighting window and enhances it to reach more indoor spaces (Figure 1). It accomplishes this through reflection, using both its reflector and the ceiling surface of the indoor space [24,25]. The light shelf can also contribute to solving the problem of daylighting imbalance in an indoor space by blocking a part of the natural light entering through a daylighting window.…”

Section: Light Shelf Concept and Review Of Previous Studiesmentioning

confidence: 99%

Evaluation of External Light Shelf Performance in Relation to the Ceiling Types Used in Indoor Spaces

Jung,

Lee,

Lee

2023

Energies

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A light shelf is a type of natural daylight system that brings natural light from the outside into an indoor space through a reflector and a ceiling surface. The introduction of light shelves has led to studies evaluating their efficiency. However, past studies on light shelves did not consider the diversity of ceiling types when evaluating their performance. Therefore, this study derives fundamental data involving external light shelf designs by evaluating light shelf performance based on the ceiling type present using a light environment simulation method. This study analyzed the indoor illuminance distribution with Radiance to evaluate the performance according to light shelves and indoor space types. The results derived from this study are as follows: (1) In the case of a flat ceiling, the performance of an external light shelf can be improved by increasing its angle and width. However, adjusting the external light shelf angle to 30° during the middle of the season and 20° in winter is ineffective because natural light is not reflected by the ceiling surface. (2) The performance of a light shelf can be improved by increasing the slope and curvature of the ceiling types specified in this study. However, setting the light shelf angle to 30° during the middle season and to 30° and 20° in winter, when external natural light entering the indoor space is not reflected by the ceiling surface, is ineffective due to the low levels of daylight performance, regardless of the type of space. (3) To increase uniformity levels in gable ceilings and curved ceilings, it is advantageous to increase the number of reflections and diffusion areas on the ceiling’s surface due to the uniqueness of these ceiling shapes. Furthermore, the optimal external light shelf angle for these ceiling types differs from that of other types. (4) Regarding the appropriate external light shelf size according to a particular ceiling type, installing an angle-controllable external light shelf with a width of 1.2 m can improve daylight performance.

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Section: Light Shelf Concept and Review Of Previous Studiesmentioning

confidence: 99%

Evaluation of External Light Shelf Performance in Relation to the Ceiling Types Used in Indoor Spaces

Jung,

Lee,

Lee

2023

Energies

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“…To improve sustainability and natural lighting. Ya Hui Teo et al [13] use simulation methods to compare different light shelf designs using photorealistic and radiance simulations. They provided an approach that improves daylight penetration, visual comfort and energy efficiency.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive multi-objective optimization of external window design for energy-efficient and comfortable buildings

Wei,

Li,

Liu

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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This paper investigates the influence of external window design parameters on air-conditioning energy consumption, daylighting and ventilation in an apartment building in Guangxi, China. In order to achieve a harmonious balance between energy consumption, interior daylight and ventilation, L16(45) orthogonal experimental design (OED) were selected. The results show that the width (B) is the most important factor in determining the comprehensive performance, followed by the material (A), height (C) and bottom height (D) of the external window. Based on empirical tests, the optimal design parameter combination emerged as A2B1C3D4 (Heat aluminum window frame and Low-E hollow glass, 1200mm×1500mm×700mm), which effectively meet low energy consumption, favourable daylighting and ventilation effects simultaneously. These evaluation results provide valuable reference for exterior window design in the context of Guangxi.

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“…There are various studies in literature related to examine lighting performance of buildings [2][3][4][5][6][7][8][9]. Besides, lighting performance of educational buildings is significant in order to be analyzed.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Illuminance Levels of Classrooms on Different Storey with or without Artificial Lighting

İnan Günaydın

2023

focsci

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Integrated lighting design is significant in terms of support energy performance and users visual comfort without expensive energy cost and comfortable environment in buildings illuminated by daylight. This study examines the illuminance levels of two chosen classrooms in the Department of Architecture at Niğde Ömer Halisdemir University. Both classrooms were oriented in north direction, and one of them is one storey above of the other one. The purpose of the study is to determine the lighting performance of classrooms with or without the utilization of artificial lighting. Illuminance levels were measured at certain points by a luxmeter at three different times of the day for five weeks duration. After, average illuminance levels were determined for both classrooms and these illuminance levels were evaluated based on lighting standards. Chosen classrooms were examined regarding their illuminance levels. Measurement results show that the illuminance values in D205 classroom on the first floor was slightly higher than the D105 classroom on the ground floor. Based on the measurements, it was realized that the highest illuminance values were generally at midday (1386 lux at D205) and the lowest illuminance values were in the morning (64 lux at D105). The study will contribute to the formation of a preliminary idea about the lighting performances in the classrooms of architects and architecture students.

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A simulation-aided approach in examining the viability of passive daylighting techniques on inclined windows

Cited by 8 publications

References 51 publications

Evaluation of External Light Shelf Performance in Relation to the Ceiling Types Used in Indoor Spaces

Evaluation of External Light Shelf Performance in Relation to the Ceiling Types Used in Indoor Spaces

Comprehensive multi-objective optimization of external window design for energy-efficient and comfortable buildings

Investigation of Illuminance Levels of Classrooms on Different Storey with or without Artificial Lighting

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