The relationship between wall reflectance and daylight factor in real rooms

Simm, Stephen; Coley, David

doi:10.1080/00038628.2011.613642

Cited by 16 publications

(10 citation statements)

References 10 publications

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“…The large window area and room height in the wood room, rather than the interior surfaces, explains this difference. This finding relates to the work of Simm and Coley (2011), who found that differences in wall surface finishes had less impact on the daylight factor than predicted.…”

Section: Quantitative Analysis -Indoor Environmental Conditionssupporting

confidence: 60%

Wood and Comfort: A Comparative Case Study of Two Multifunctional Rooms

2016

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Section: Quantitative Analysis -Indoor Environmental Conditionssupporting

confidence: 60%

Wood and Comfort: A Comparative Case Study of Two Multifunctional Rooms

2016

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“…It also applies radiosity techniques [15]. In order to validate this software in a research [42] the Relux software was compared with SPOT and DAYSIM software and it was found that the Relax calculation process is very fast while the SPOT and DAYSIM calculations are costly and time consuming and other Relux error rates are lower. In fact, according to Table 1, the lighting process and detail of Relux software [40] uses the Radiosity method and in some cases also uses the Ray tracing method.…”

Section: Methodsmentioning

confidence: 99%

“…In order to obtain the amount of daylight indoors, the intensity of the outdoor lighting needs to be calculated to be aware of the amount of outdoor light received indoors. Exterior light can reach the building through window glass, skylights or other openings, in three ways [42].…”

Section: Daylight Factor (Df)mentioning

confidence: 99%

Parametric Analysis of Architectural Elements on Daylight, Visual Comfort, and Electrical Energy Performance in the Study Spaces

Nasrollahi

Shokry

2020

Journal of Daylighting

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The quality of visual comfort has always been an essential element considering human comfort. Providing visual comfort in a living environment reduces the need for artificial lighting, which subsequently has a direct relationship with energy consumptions and its expenses. Besides, the maximum possible usage of daylight instead of artificial lighting significantly contributes to providing a favourable condition in terms of visual comfort for the residents. This essential factor is manifested in public spaces, such as libraries that are associated with students and the quality of their study time. The main aim of this paper is to provide applied solutions to use more natural lighting strategies as an alternative for artificial lighting, which helps to reduce electric energy consumption while providing visual comfort for users. The role of architectural elements, such as the position and dimensions of the windows, reflectivity of materials, layout of surfaces, and appropriateness of space in line with the objectives as mentioned earlier are examined thoroughly. For this purpose, literature studies, as well as computer simulations via Relux software, are utilized to investigate the set research objectives. Finally, the simulation results suggest that the best orientation to achieve the optimal model using daylight in study spaces is northernsouthern orientation. In addition, using windows with maximum height in the middle of the transverse front of buildings with window to wall ratio of 35 to 45 percent along the vertical and horizontal divisions (grid) is suitable for such places. Design criteria include the higher access to daylight, visual comfort, and reduction of electrical energy consumption. The reflectivity coefficients for roof materials, floor, and walls are 0.6, 0.4, 0.4, and 0.6, respectively, and transparency for windows is 80%. The obtained results also suggest the length-to-width ratio and height-to-width ratio are 6-to-5 while horizontal and vertical surfaces in near windows and in middle space along the longitudinal direction are optimal for research purposes.

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“…The project needs to judge the building lighting from multiple dimensions of illumination, so the following lighting parameters shown in Table 2 are adopted for the project: daylight factor [11] [12], illumination uniformity (U0) [12], daylight autonomy [13], and daylight glare probability [14].…”

Section: Study Parametersmentioning

confidence: 99%

Daylighting Performance Design for Art Studios of Old Factory Renovation Buildings in Subtropical Regions

Pei¹,

Men²,

Jiang³

2022

OJCE

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In the subtropical zone of China, a large number of old factory buildings rich in industrial historical and cultural value have been transformed into art studios. In the existing research on building renovation, there are still problems such as insufficient lighting, low uniformity, and ignoring the effect of glare in the lighting environment of buildings after transformation. To fill this research gap, this paper provides a daylighting design strategy for these factory buildings in subtropical zones to ensure that the transformed art studios can offer an excellent indoor daylighting environment. Through the control variable method, the window-to-wall ratio, the form of external windows, and the visible light transmittance of glass are set with quantitative and variable values, and a design strategy that meets the requirements of international general daylighting standards is obtained step by step through the simulation. The daylight factor, uniformity, daylight autonomy, and dynamic glare probability are used in this research process to measure whether the daylighting strategy meets the daylighting requirements of the CIBSE Lighting Guide for art studios. The results show that the average indoor lighting coefficient can be increased from 1.29 to 6.18, and the minimum value of the lighting coefficient can be increased from 0.4 to 4.4 by enlarging the windowed wall ratio from 1:30 to 1:3, using the combination method of the horizontal window, skylight and skylight recommended by the analysis results, and selecting veneer glass with 88% transmittance. This allows for better uniform lighting inside the building and reduces glare. This conclusion can support the lighting performance design of industrial buildings in the future.

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The relationship between wall reflectance and daylight factor in real rooms

Cited by 16 publications

References 10 publications

Wood and Comfort: A Comparative Case Study of Two Multifunctional Rooms

Wood and Comfort: A Comparative Case Study of Two Multifunctional Rooms

Parametric Analysis of Architectural Elements on Daylight, Visual Comfort, and Electrical Energy Performance in the Study Spaces

Daylighting Performance Design for Art Studios of Old Factory Renovation Buildings in Subtropical Regions

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