Prediction Model of Optical Characteristics for Barrel Vault Skylights

Laouadi, Abdelaziz; Atif, Morad R.

doi:10.1080/00994480.2002.10748392

Cited by 4 publications

(7 citation statements)

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“…Non-flat (or projecting) skylights exhibit different performance than planar fenestration [1][2][3] . The equivalent visible transmittance of the skylight (τ eq ), is defined as the ratio of the transmitted energy flux exiting from the skylight aperture opening to the flux incident on the horizontally projected skylight surface.…”

Section: Methodsmentioning

confidence: 99%

“…A 1 , A 2 : designate the geometry of the side surfaces of the skylight A 3 : designates the geometry of the top surface of the skylight A 11 : portion of surface A 1 through which solar rays undergo only direct transmission A 12 : portion of surface A 1 through which solar rays undergo transmission and inter-reflection…”

Section: List Of Symbolsmentioning

confidence: 99%

“…Analytical models based on the ray-tracing technique have been developed to predict the overall optical characteristics of transparent barrel vault skylights under beam light 3 . The same ray-tracing technique was also applied to other skylight shapes 14,15 .…”

Section: Mathematical Formulationmentioning

confidence: 99%

“…Introducing the concept of the optically equivalent flat skylight that has the same aperture surface area and yields the same transmitted, absorbed and reflected flux as the barrel vault skylight, the equivalent optical characteristics of barrel vault skylights are expressed as follows 3,14 :…”

Section: Beam Equivalent Optical Characteristicsmentioning

confidence: 99%

“…Properly designed skylights may save a substantial amount of energy for lighting, heating and cooling 1,2 . Recent research has shown that the skylight shape and glazing type can significantly alter the skylight energy performance [1][2][3] . The air space directly underneath the skylight may reduce the solar heat gains by up to 25% 4 , and the annual cooling energy by up to 6% 5 .…”

Section: Introductionmentioning

confidence: 99%

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Models of optical characteristics of barrel-vault skylights: development, validation and application

Laouadi

2005

Lighting Research & Technology

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1191/1365782805li141oaLighting Research & Technology, 37, 3, pp. 235-264, 2005-09-01 Models of optical characteristics of barrel-vault skylights: development, validation and application Laouadi, A. ABSTRACTBy admitting natural light deep into a building and connecting occupants with the outside, skylights can improve the aesthetic look of buildings and increase occupant satisfaction. In addition, by allowing the entry of natural light electric light levels can be reduced thereby leading to energy savings. However, the potential energy benefits and amenities of skylights have not been fully exploited in today's building design due to some theoretical and technical challenges. The lack of design tools is one of the major hurdles building designers face to adopt such products and quantify their energy benefits. The optical characteristics of skylights are the significant factors affecting their energy benefits. Recognizing this gap, the SkyVision tool was developed to assist skylight manufacturers and building designers in developing appropriate skylight designs for given building types and daylighting applications. This paper describes

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Section: Methodsmentioning

confidence: 99%

Section: List Of Symbolsmentioning

confidence: 99%

Section: Mathematical Formulationmentioning

confidence: 99%

Section: Beam Equivalent Optical Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Models of optical characteristics of barrel-vault skylights: development, validation and application

Laouadi

2005

Lighting Research & Technology

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Lighting and visual comfort performance of commercially available tubular daylight devices

Fernandes

Regnier

2023

Solar Energy

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Tubular daylighting devices. Part I: Development of an optical model (1415-RP)

et al. 2013

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Tubular Daylighting Devices (TDDs) are systems that collect and channel daylight from building roofs into deep interior spaces. To meet high standards of building energy efficiency and glare-free indoor environments, TDD technologies have been rapidly and continuously evolving over the past two decades. However, this pace has been counteracted by a lack of reliable computer design tools. This paper presents the development of analytical models to compute the optical characteristics (transmittance, reflectance and layer absorptances) of various types of complex TDDs. New metrics for the optical and lighting performance are developed. The optical models are based on the ray-tracing technique, and account for the spectral (monochromatic) or broadband optical properties of TDD glazing panes. Experimental validation of these models is presented in an accompanying paper (Laouadi et al., 2013c).

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Prediction Model of Optical Characteristics for Barrel Vault Skylights

Cited by 4 publications

References 4 publications

Models of optical characteristics of barrel-vault skylights: development, validation and application

Models of optical characteristics of barrel-vault skylights: development, validation and application

Lighting and visual comfort performance of commercially available tubular daylight devices

Tubular daylighting devices. Part I: Development of an optical model (1415-RP)

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