@article {30007, title = {Daylight performance of a microstructured prismatic window film in deep open plan offices}, journal = {Building and Environment}, volume = {113}, year = {2017}, month = {02/2017}, pages = {280{\textendash}297}, abstract = {

Daylight redirecting systems with vertical windows have the potential to offset lighting energy use in deep perimeter zones. A microstructured prismatic film designed for such use was characterized using goniophotometric measurements and ray tracing simulations. The synthetically-generated bidirectional scattering distribution function (BSDF) data were shown to have good agreement with limited measured data for normal incident angles (0{\textendash}60{\textdegree}). Measured data indicated that the prismatic film was most efficient when vertical angles of incidence were between 18 and 35{\textdegree} and within {\textpm}45{\textdegree} of normal incidence to the plane of the window so maximum energy savings across the full depth of the zone occurred over the equinox to winter solstice period. Annual lighting energy use and visual comfort in a deep open plan office zone were evaluated using the Radiance three-phase method in several climates and for south and east-facing window orientations. Lighting energy savings were 39{\textendash}43\% for a 12\ m (40\ ft) deep south-facing perimeter zone compared to the same zone with no lighting controls. The prismatic film with and without a diffuser controlled glare for views parallel to the window but produced glare for seated viewpoints looking toward the window. At mature market costs, the system was projected to have a simple payback of 2{\textendash}6 years. Technical challenges encountered throughout the evaluation led to improvements in measurement and modeling tools and stressed the importance of having accurate input data for product development.

}, issn = {0360-1323}, doi = {10.1016/j.buildenv.2016.07.019}, author = {Andrew McNeil and Eleanor S. Lee and Jacob C. Jonsson} } @proceedings {60933, title = {Discomfort glare with complex fenestration systems and the impact on energy use when using daylighting control}, journal = {10th International Conference on Advanced Building Skins}, year = {2015}, month = {11/2015}, address = {Bern, Switzerland}, keywords = {building simulation, Complex fenestration systems, daylighting control, Discomfort Glare, Energy Use Intensity, radiance}, author = {Sabine Hoffmann and Andrew McNeil and Eleanor S. Lee and Raghuram Kalyanam} } @techreport {1207, title = {Daylight performance of a microstructured prismatic window film in deep open plan offices}, year = {2013}, month = {09/2013}, abstract = {

Daylight redirecting systems with vertical windows have the potential to offset lighting energy use in deep perimeter zones. A microstructured prismatic film was designed and fabricated by a manufacturer to redirect sunlight to the ceiling plane when the film was installed in the upper portion of a window. Energy simulations based on the raytracing program, Radiance, were performed to evaluate the annual lighting energy use and discomfort glare in a deep open plan office zone in several climates and for south and east-facing window orientations. These simulations showed that when the prismatic film was combined with a light diffusing film, the system was able to deliver significant energy savings without glare.

}, author = {Andrew McNeil and Eleanor S. Lee and Jacob C. Jonsson} } @techreport {1212, title = {Development of a simulation-based controls framework for implementation of controls algorithms for complex fenestration systems}, year = {2012}, month = {09/2012}, pages = {15}, type = {DOE/ CEC PIER Technical Report}, abstract = {

Effectively controlled dynamic windows can substantially reduce the energy consumption of buildings. Unfortunately, modular and extensible frameworks for testing and evaluating window system control algorithms that include the effects of thermal mass are missing in the research community.

This paper describes a modular and extensible simulation-based framework that uses different simulation tools such as EnergyPlus, Modelica, Radiance, and the Building Controls Virtual Test Bed (BCVTB) to develop and evaluate the performance of integrated fa{\c c}ade control strategies. We present a simulation framework and a proof-of concept application using the framework to control a venetian blind in a physical test cell in order to reduce its zone thermal load based on solar inputs and internal gains measured at the test cell.

}, author = {Thierry Stephane Nouidui and Andrew McNeil and Eleanor S. Lee} }