@techreport {58686, title = {Simulated daylight performance of a new prototype prismatic window film in deep open plan offices}, year = {2013}, month = {09/2013}, type = {DOE/ CEC PIER Technical Report}, author = {Andrew McNeil and Eleanor S. Lee} } @techreport {1217, title = {On the sensitivity of daylight simulations to the resolution of the hemispherical basis used to define bidirectional scattering distribution functions}, year = {2011}, month = {09/2011}, pages = {19}, type = {DOE / CEC PIER Technical Memorandum}, abstract = {

The Radiance simulation program includes new tools that enable daylight modeling of complex fenestration systems (CFS) using bi-directional transmission distribution functions (BTDF). The tools use the Klems angle basis to define the number of paired incoming and outgoing data values. However, the Klems angle basis was developed for thermal simulations and may be too low of a resolution for some types of daylight systems, particularly those that exhibit peaky, specular transmission. This study evaluates the sensitivity of the angle basis resolution by comparing simulation results for the Klems angle basis against results using two higher resolution angle bases. The first evaluation compares results for specific points in time. The second evaluation compares simulation results using annual performance metrics. Annual lighting energy data were found to agree to within 1\%. Annual assessments of discomfort glare were found to disagree by 7\% because high resolution basis resolved glare sources into smaller, more intense sources. We concluded that high resolution bases are appropriate for specific types of CFS and performance metrics.

}, author = {Andrew McNeil} } @article {1799, title = {Simulating the Daylight Performance of Complex Fenestration Systems Using Bidirectional Scattering Distribution Functions within Radiance}, journal = {Leukos, The Journal of the Illuminating Engineering Society}, volume = {7}, year = {2011}, month = {04/2011}, chapter = {241}, abstract = {

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.

}, keywords = {bidirectional scattering distribution function (BSDF), Complex fenestration systems, daylighting systems, energy, Radiance software, Shading Systems, windows}, issn = {1550-2724}, doi = {10.1080/15502724.2011.10732150}, author = {Gregory J. Ward and Richard G. Mistrick and Eleanor S. Lee and Andrew McNeil and Jacob C. Jonsson} }