5.1.3 Daylight Modeling
Simulate the interactions of openings in the building envelope and how they affect overall daylight infiltration and distribution inside the building with the goal to maximize daylight access and reduce energy needs for electrical lighting.
The testing of physical and virtual models may take the following into account: geographic coordinates and solar designation, orientation, window area, room floor area, room cavity ratios, visible angle to the sky, window geometry, window height, visible light transmittance of glazing, interior room reflectance and average seasonal cloud coverage.
Physical models are an accurate way to evaluate the effects of daylighting and can be a very cost-effective method of analysis. Software programs such as Radiance by the Lawrence Berkeley National Laboratory, DAYSIM and Sketch-up can be used to evaluate and analyze daylight effects, which helps the design process and coordination. Consult your Callison Energy Modeling Team for daylight modeling, including retail skylight analysis, to optimize daylight while minimizing solar heat gain.
Reduced electrical lighting demands, glare mitigation and associated productivity gains. Increased building value due to informed performance fine-tuning during schematic design.
Increased occupant comfort and performance and early detection of lighting deficiencies within the building design.
A simple physical white model is required for the testing of a physical or virtual model. For example, the Seattle Daylighting Lab has a mirror-box overcast sky with heliodon sun simulators and digital photographic/film with light flux metering equipment for the analysis of physical models at all stages of the design process, free of charge.