An Evaluation of Useful Daylight Illuminance in an Office Room with a Light Shelf and Translucent Ceiling at 51° N

Brzezicki, Marcin

doi:10.3390/buildings11110494

Cited by 12 publications

(16 citation statements)

References 47 publications

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“…In another research, in addition to combining the light shelf and horizontal louvers, a semitransparent surface has been used in line with the light shelf so that the light penetrates deeper into the space, increases its uniformity and reduces glare. [16] (Figure 15) 2) Since it is not possible to increase the efficiency of the lighting system and electricity generation simultaneously, in one of the examples, folding technology has been used to combine them. In this way, half of the diagonal plates are responsible for light transmission and the other half for energy production [14].…”

Section: Combination Of the Light Shelf With Prism Sheets (Diffusion ...mentioning

confidence: 99%

A Review of Factors Affecting the Lighting Performance of Light Shelves and Controlling Solar Heat Gain

Masoud,

Zamani,

Hosseini

et al. 2024

Preprint

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In areas with a deep floor plan, the distribution of natural light is not uniform. Consequently, relying solely on daylight may not suffice to meet the space's lighting requirements, necessitating the use of artificial lighting in darker areas. Therefore, a lighting system is needed that not only controls the glare near the windows but also increases the light at the end of the room and provides uniform daylight. One of the widely used systems is the “light shelf“which has three main functions: shading, increasing the depth of light penetration and reducing glare. Review articles about light shelves have been done in 2015 and 2017, while more than 80% of the studies have been carried out since 2016 and light shelves with more diverse forms and dynamic elements and many consolidations were proposed. Therefore, there is a need for a more comprehensive review. The main question of this research is how different parameters (including climate, material, ceiling and integrated systems) can help to increase the efficiency of light shelves. By using a systematic review, studies in the past three decades were classified in order to determine the effect of these parameters on improving lighting performance and controlling solar heat gain.

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Section: Combination Of the Light Shelf With Prism Sheets (Diffusion ...mentioning

confidence: 99%

A Review of Factors Affecting the Lighting Performance of Light Shelves and Controlling Solar Heat Gain

Masoud,

Zamani,

Hosseini

et al. 2024

Preprint

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“…The honeybee Legacy is one of Grasshopper's plug-ins, which assists Grasshopper to conduct sustainability simulations, such as daylight analysis using Radiance engine. Radiance is software that was numerously validated previously by other researchers [42][43][44][45]. Reinhart and Walkenhorst [42] have shown that Radiance-based simulation methods "are able to efficiently and accurately model complicated daylighting elements such as Venetian blind system".…”

Section: Simulation Of the Building Smart With Color Coated Windowpanementioning

confidence: 99%

The Effect of Smart Colored Windows on Visual Performance of Buildings

2022

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The photochromic coating is a promising smart technology that provides different optical properties in response to daylight variations. The application of photochromic coatings with various colors/shades on window glass is one of the current research approaches for finding better energy saving techniques. The aim of this study was to develop a series of photochromic coatings for window glass and measure the impact of such smart technologies on occupants’ visual comfort. This paper examines the visual performance of building facades that utilize windows with different photochromic-coated glass. The visual performance data of three window types coated with nine different photochromic color shades were considered and compared to determine the best photochromic shades and window types that provide optimum visual metrics for the inside of the building. The results show that compared to no-coating glass, both the Daylight Glare Probability and the Useful Daylight Illuminance could be improved by using multi-color coatings that contain equal or different color proportions for photochromic window glass. From an energy-saving point of view, the results indicate that the windows coated with photochromic materials provide a better alternative to the no-coating window products.

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“…The design of buildings using daylighting-based strategies is very desirable [1]. Daylighting can significantly reduce the energy consumption of buildings and also has a positive impact on occupants' visual comfort [2][3][4][5], but an inappropriate daylighting-based design can reduce this advantage [1,3,6,7]. Generally, office environments need careful daylighting design due to their function [6,[8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Daylighting can significantly reduce the energy consumption of buildings and also has a positive impact on occupants' visual comfort [2][3][4][5], but an inappropriate daylighting-based design can reduce this advantage [1,3,6,7]. Generally, office environments need careful daylighting design due to their function [6,[8][9][10]. Employees' productivity in offices directly affects the organization's financial efficiency and overall growth [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Subjective and Simulation-Based Analysis of Discomfort Glare Metrics in Office Buildings with Light Shelf Systems

et al. 2023

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Glare is a kind of physiological phenomenon that influences occupants’ visual comfort. Discomfort glare scenes in comparison to other levels of glare have been difficult to estimate and need accurate and reliable metrics. In contemporary architecture, the glass façade is so popular since it can remarkably minimize energy consumption in buildings and maximize daylight utilization as a natural energy. However, it is necessary to consider occupants’ visual discomfort due to the daylighting glare risks during the initial stage of design. Since the measured glare metrics should have an acceptable correlation with the human subject data study, the agreement on the glare indices is complicated. This paper presents a comparison between subjective and simulation-based analysis of discomfort glare metrics in offices with a light shelf system. The discomfort glare metrics considered in this study include Daylight Glare Index (DGI), CIE Glare Index (CGI), Visual Comfort Probability (VCP), Unified Glare Rating (UGR), and Daylight Glare Probability (DGP). The parallel comparison was conducted by using simulation and questionnaire surveys to determine which criteria are more useful under different conditions. According to the findings, DGP yields the most reliable results in different levels of glare based on the subjective analysis and VCP has the lowest accuracy in each stage. UGR also has the highest accuracy rate for evaluating perceptible glare, DGI is applicable for assessing imperceptible glare, and CGI can be an acceptable index for approximating intolerable glare. The study results significantly reduce the complexity of the problem and can provide useful guidance for designers to select the most reliable glare metric based on climatic conditions.

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An Evaluation of Useful Daylight Illuminance in an Office Room with a Light Shelf and Translucent Ceiling at 51° N

Cited by 12 publications

References 47 publications

A Review of Factors Affecting the Lighting Performance of Light Shelves and Controlling Solar Heat Gain

A Review of Factors Affecting the Lighting Performance of Light Shelves and Controlling Solar Heat Gain

The Effect of Smart Colored Windows on Visual Performance of Buildings

Subjective and Simulation-Based Analysis of Discomfort Glare Metrics in Office Buildings with Light Shelf Systems

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