Evaluating visual comfort and performance of three natural lighting systems for deep office buildings in highly luminous climates

Ochoa, Carlos Ernesto; Capeluto, Isaac Guedi

doi:10.1016/j.buildenv.2005.05.001

Cited by 92 publications

(47 citation statements)

References 5 publications

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“…The increasing trend for adopting large transparent envelopes often requires the integration of shading systems. These architectural elements reduce glare issues, provide better illumination distribution, and ideally can also increase the daylighting penetration into the spaces [1][2][3][4]. Light shelves are typically placed above the eye level and can be internal and/or external.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Impacts of Light Shelves on the Useful Daylight Illuminance in Office Buildings in Toronto

Berardi

Anaraki

2015

Energy Procedia

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Modern envelope technologies and architectural trends often encourage the construction of buildings with large glazing surfaces. Glazed facades are often proposed with the intent to guarantee high daylight levels and wide exterior views. However, an increasing attention is nowadays recognized to glare issues and indoor comfort levels. Consequently, light shelves are often proposed to help reducing glare issues, providing better illumination distribution, and increasing the homogeneity of daylight distribution into the spaces. In this paper, the impact of light shelves over the illuminance levels in a south facing office building in Toronto is evaluated. The Useful Daylight Illuminance (UDI) is considered as the metric of analysis. Annual simulations for four different window-to-wall ratios (WWR) are compared with and without light shelves. Results show that light shelves enhance the UDI levels mainly in the first six meters in front of the windows, and provide a more homogeneous daylight distribution with an increase of the UDI for any considered WWR. Finally, this paper shows that WWR above 35% result in increasing daylight quantity with higher glare issues, and in case of the adoption of floor to ceiling windows, WWR above 35% are not advantageous in terms of daylighting.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Impacts of Light Shelves on the Useful Daylight Illuminance in Office Buildings in Toronto

Berardi

Anaraki

2015

Energy Procedia

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“…As for southern windows, a shading coefficient (SC) of 0.5 is recommended. For this orientation, a horizontal feature with a light-shelf may further improve the performance [22]. Eastern and western windows need a system that provide SC = 0.1 to obstruct direct radiation, and SC = 0.5 for indirect radiation to allow the use of daylight.…”

Section: Window's Shadingmentioning

confidence: 98%

Climatic considerations in school building design in the hot–humid climate for reducing energy consumption

Perez

Capeluto

2009

Applied Energy

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“…Ochoa and Capeluto [41] performed a daylight analysis of a deep meeting room equipped with a light shelf using radiance simulations. The room is located in Haifa (Latitude: 32.5 • N).…”

Section: Performance Analysis Of Static Horizontal Light Shelvesmentioning

confidence: 99%

A Review of Light Shelf Designs for Daylit Environments

et al. 2017

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Light shelves have been discussed in numerous studies as suitable solutions for controlling daylight in side-lit spaces. It is a system that can be easily modified, offering a range of design solutions. It can be easily mounted on the exterior and/or the interior of a vertical opening, it can come in various shapes from static flat forms to curved reflective surfaces, or it can even be actively controlled. A light shelf can offer shading and at the same time can redirect a significant part of the incoming light flux towards the ceiling improving daylight uniformity. Due to the aforesaid functions, light shelves are among the most popular system design solutions when it comes to daylight exploitation. The purpose of this paper is twofold. Firstly, to present the main research findings in relation to light shelves as daylighting systems and secondly to analyze the results, trying to establish a common basis for some efficient and practical design rules. The present paper is a review of the research realized in the last three decades concerning these systems together with their associated implications in a building's daylight performance as well as in its energy balance in a few cases. In addition, the critical review of their design principles is included, which makes the presented information useful for design teams trying to select the optimal available system for any specific project.

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Evaluating visual comfort and performance of three natural lighting systems for deep office buildings in highly luminous climates

Cited by 92 publications

References 5 publications

Analysis of the Impacts of Light Shelves on the Useful Daylight Illuminance in Office Buildings in Toronto

Analysis of the Impacts of Light Shelves on the Useful Daylight Illuminance in Office Buildings in Toronto

Climatic considerations in school building design in the hot–humid climate for reducing energy consumption

A Review of Light Shelf Designs for Daylit Environments

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