Performance of laser cut light deflecting panels in daylighting applications

Edmonds, Ian

doi:10.1016/0927-0248(93)90088-k

Cited by 69 publications

(44 citation statements)

References 6 publications

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“…Radiance has been validated by different researchers in different cases, and obtained results have been found to be in good agreement with experimental measurements [19][20][21][22]. Algorithm in [1] was used to model the LCP in Radiance. The algorithm was developed to effectively model the devices in Radiance for improving lighting simulation.…”

Section: Radiancesupporting

confidence: 48%

“…The practical method of producing a light directing panel using LCP was invented in 1988, and the optical theory of LCP was developed and become available with easiness in manufacturing in 1993 [1,2]. LCP is an optical material produced by making fine parallel laser cuts in a thin panel of clear acrylic material [1,2]. The fractions of these components depend on the cut-depth to cut-spacing ratio and the incident angle of sunlight [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…In 1898, Wadsworth invented the concept of forming arrays of reflectors inside transparent glazing, but it was not known until 1988 to make a linear cutting inside the glazing. The practical method of producing a light directing panel using LCP was invented in 1988, and the optical theory of LCP was developed and become available with easiness in manufacturing in 1993 [1,2]. LCP is an optical material produced by making fine parallel laser cuts in a thin panel of clear acrylic material [1,2].…”

Section: Introductionmentioning

confidence: 99%

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Maximizing the Performance of Laser Cut Panel by Interaction of Ceiling Geometries and Different Aspect Ratio

Freewan

2014

Journal of Daylighting

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The interaction between different ceiling geometries with laser cut panels (LCPs) is investigated using real experiments and computer simulations to maximize the daylight performance of the LCP. In addition, LCP with different aspect ratios (width to depth ratio) is studied using simulation with clear sky conditions in hot climate region. Two main performance parameters are investigated: illuminance level and distribution uniformity in a large space located in a sub-tropical climate region like Jordan. It was found that curved and chamfered ceilings increased the daylight level in the rear part of the studied room by 20% compared to a horizontal flat ceiling and reduce it by 30% in front part that improve the quality of daylight by improving the uniformity. LCP with high aspect ratio of 5:6 performed well in climate with clear sky and high solar angles than LCP with ratio of 4:6.

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Section: Radiancesupporting

confidence: 48%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Maximizing the Performance of Laser Cut Panel by Interaction of Ceiling Geometries and Different Aspect Ratio

Freewan

2014

Journal of Daylighting

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“…The louvers called LCP panels are to be mounted onto existing window sashes by hinged joints so that it is possible to adjust the inclinations of the louvers to capture the best daylight according to changing sun-angles. Inside the room opposite the windows, there will be corresponding reflectors, constructed of matt white finished timber panels suspended from the ceiling to receive and re-direct incident day-light into deeper interiors (Edmonds, 1993) (Fig. 5, 6) (Spiegel and Meadows, 1999) The dimming system is an important sustainable technology incorporated to ensure the optimum performance of both lighting environment and energy efficiency.…”

Section: Day Lighting Designmentioning

confidence: 99%

Green Architecture at HKU, the Eliot Experiment

Lau

Cheng

Liu

et al. 2004

Journal of Asian Architecture and Building Engineering

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This is a research by design project, made possible by a live project engaging a historic building on the University campus. The Eliot Hall was originally one of three residences for undergraduate students built in the nineteen thirties. The authors collaborated with the Estate Office and the User Center of Journalism and Media Studies to put in place their research agenda as "Green Architecture -the Eliot Experiment 2001" to study the following hypothesis: (1) passive environmental design strategies; (2) man-nature interactions; (3) user interactive controls of environmental performance; (4) green education. This paper underlines the process from design, construction, fitting out/re-modeling (completed in the Summer of 2003), and the setting up of a data monitoring and display system (Spring and Summer, 2004).

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“…This effort in optimization has lead to the development of a large variety of innovative fenestration systems [1,2,3,4], including solar blinds, novel glazing or coating materials and daylight-redirecting devices, whose directional properties need to be assessed accurately to allow their efficient integration in buildings and to benefit from their potential as energy-efficient strategies.…”

Section: Introductionmentioning

confidence: 99%

Design of a time-efficient video-goniophotometer combining bidirectional functions assessment for transmission and reflection

Andersen

Roecker

Scartezzini

2005

Solar Energy Materials and Solar Cells

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A detailed knowledge of the light distribution characteristics through advanced window systems is required to improve the visual comfort of the building's occupants while controlling the propagation of daylight in rooms and the solar gains. An innovative bidirectional goniophotometer has recently been set up for this purpose, using digital image capture and the projection of the emerging light on a diffusing screen.It therefore provides a continuous investigation of the bidirectional transmission figures in a time-efficient way. This instrument was converted into a double-purpose device, allowing both transmission and reflection measurements, which induced several strong constraints due to the conflict of incident and emerging light flux in reflection mode: on one hand the incident beam had to be restricted to the sample area only; on the other hand, as the screen obstructed the incoming light flux in some positions, a special opening in the latter was required. The practical answer to these constraints, detailed in this paper, proved to be reliable, appropriate and efficient.

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Performance of laser cut light deflecting panels in daylighting applications

Cited by 69 publications

References 6 publications

Maximizing the Performance of Laser Cut Panel by Interaction of Ceiling Geometries and Different Aspect Ratio

Maximizing the Performance of Laser Cut Panel by Interaction of Ceiling Geometries and Different Aspect Ratio

Green Architecture at HKU, the Eliot Experiment

Design of a time-efficient video-goniophotometer combining bidirectional functions assessment for transmission and reflection

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