Modelling indoor illumination by complex fenestration systems based on bidirectional photometric data

Boer, Jan de

doi:10.1016/j.enbuild.2006.03.018

Cited by 22 publications

(11 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…-As only diffuse sky luminance distributions have been studied, further validation for the direct component would be desirable. Indications on the performance of BTDF-data based algorithms under direct illumination can be found in [26]. -The use of higher resolutions in assessing BTDF (on the incident side) should be considered to avoid related error sources, especially as the time and cost associated to determine BTDF data are decreasing thanks to new developments.…”

Section: Discussionmentioning

confidence: 99%

“…including peaks) as for LCP and Serraglaze). When both the sky distribution and the BTDFs involved high frequency components, the error in the final intensity distribution can increase at high resolution [26]. Other error sources specific to each method could also be predicted, for example those related to the reveal-depth algorithm applied by DElight, or to the accuracy parameters defined in each of the tested methods.…”

Section: Error Analyses 431 Errors With Btdf-based Indoor Illuminatmentioning

confidence: 99%

“…Such artifacts result from the fact that the data resolution on the incident side (145 points) is usually significantly lower than the resolution on the emerging hemisphere and are illustrated in Figure 10. The filtering procedure is explained in more detail in reference [26]. Figure 10 For this study an implementation of the method into the RADIANCE program system was used.…”

Section: Cfs Algorithm -Fhg-ibpmentioning

confidence: 99%

See 2 more Smart Citations

Experimental validation of simulation methods for bi-directional transmission properties at the daylighting performance level

Maamari

Andersen

Boer

et al. 2006

Energy and Buildings

Self Cite

View full text Add to dashboard Cite

The objective of this paper is to assess the capability of existing lighting simulation methods to predict the performance of complex fenestration systems (CFS), whose potential in daylight and sunlight control make them an increasingly popular alternative to conventional glazing. The research was conducted in two phases. First, collect reliable reference data by taking illuminance measurements inside a black box under a measured and controlled external luminance distribution, the black-box's only aperture being covered with a complex glazing sample. Two types of materials were used: a Serraglaze TM element and a Laser Cut Panel (LCP). Several simulation methods were then investigated and validated against this reference case. On one hand, measured BTDF for both material samples were integrated in different simulation tools to determine the resulting indoor lighting conditions under the external luminance distribution chosen for the reference case. The same method was then applied with calculated BTDF data, based on ray-tracing calculations. Finally, one of the CFS (the LCP) was modeled in a backward ray-tracing program so that the inside illuminance distribution could be deduced without requiring BTDF data to be used. The comparison between the experimental reference data and the simulation results showed that the effect of the CFS on the room's illumination could be predicted with acceptable accuracy for most of the tested methods (generally within 10%-20%). The simplicity of the testing scenarios allowed error sources related to simulation to be highlighted and helped determine the extent to which an accurate physical description of the samples could influence the results. Based on this study, recommendations were made for a better use of existing simulation methods.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Error Analyses 431 Errors With Btdf-based Indoor Illuminatmentioning

confidence: 99%

Section: Cfs Algorithm -Fhg-ibpmentioning

confidence: 99%

See 1 more Smart Citation

Experimental validation of simulation methods for bi-directional transmission properties at the daylighting performance level

Maamari

Andersen

Boer

et al. 2006

Energy and Buildings

Self Cite

View full text Add to dashboard Cite

show abstract

“…This is why the default method computes a secondary light source ('l-'), leaving the final rendering phase to create a realistic view out the window. Similarly, direct contributions passing through the window are also rendered, such as the detailed shadows cast by venetian blinds, which would be nearly impossible to produce using a BSDF [de Boer 2006].…”

Section: Single Time-step Evaluations and Renderings Of Cfs In Radianmentioning

confidence: 99%

Simulating the Daylight Performance of Complex Fenestration Systems Using Bidirectional Scattering Distribution Functions within Radiance

Ward¹,

Mistrick

Lee

et al. 2011

LEUKOS

106

View full text Add to dashboard Cite

We describe two methods which rely on bidirectional scattering distribution functions (BSDFs) to model the daylighting performance of complex fenestration systems (CFS), enabling greater flexibility and accuracy in evaluating arbitrary assemblies of glazing, shading, and other optically-complex coplanar window systems. Two tools within Radiance enable a) efficient annual performance evaluations of CFS, and b) accurate renderings of CFS despite the loss of spatial resolution associated with low-resolution BSDF datasets for inhomogeneous systems. Validation, accuracy, and limitations of the methods are discussed.

show abstract

“…The term CFS covers all non-specularly transmitting fenestration system components including layers that provide shading, such as fabric shades, louvered blinds, and metal mesh systems, and layers that improve interior daylighting, such as prismatic films and mirrored louvered systems. In order to promote and improve upon the performance of these technologies, researchers worldwide have been developing the computational methods, tools, and supporting data to more accurately characterize the solar-optical and daylighting performance of CFS (Papamichael et al, 1988;Klems, 1994a,b;Aydinli and Kaase, 1999;Schregle, 2004;deBoer, 2006;Andersen and deBoer, 2006). Existing Published in Solar Energy.…”

Section: Introductionmentioning

confidence: 99%

A validation of a ray-tracing tool used to generate bi-directional scattering distribution functions for complex fenestration systems

et al. 2013

View full text Add to dashboard Cite

Fenestration attachments are anticipated to produce significant reductions in building energy use because they can be deployed quickly at low-cost. New software tools enable users to assess the building energy impacts of optically complex fenestration systems (CFS) such as shades, Venetian blinds, or daylighting systems. However, such tools require users to provide bi-directional scattering distribution function (BSDF) data that describe the solar-optical performance of the CFS. A free, open-source Radiance tool genBSDF enables users to generate BSDF data for arbitrary CFS. Prior to genBSDF, BSDF data for arbitrary fenestration systems could only be produced using either expensive software or with expensive equipment. genBSDF outputs CFS data in the Window 6 XML file format and so can be used with CFSenabled software tools to model multi-layered window systems composed of glazing and shading layers.We explain the basis and use of the genBSDF tool and validate the tool by comparing results for four different cases to BSDF data produced via alternate methods. This validation demonstrates that BSDFs created with genBSDF are comparable to BSDFs generated analytically using TracePro and by measurement with a scanning goniophotometer. This tool is expected to support accelerated adoption of fenestration attachments and daylighting technologies.

show abstract

Modelling indoor illumination by complex fenestration systems based on bidirectional photometric data

Cited by 22 publications

References 5 publications

Experimental validation of simulation methods for bi-directional transmission properties at the daylighting performance level

Experimental validation of simulation methods for bi-directional transmission properties at the daylighting performance level

Simulating the Daylight Performance of Complex Fenestration Systems Using Bidirectional Scattering Distribution Functions within Radiance

A validation of a ray-tracing tool used to generate bi-directional scattering distribution functions for complex fenestration systems

Contact Info

Product

Resources

About