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By studying the variables of daylight harvesting under various conditions, lighting designers can determine what works best.
To complete this study, IES-VE software was used as the energy and daylighting simulation tool. It has Radiance, commonly used for daylighting analysis, as a built-in tool. Radiance calculates the amount of the light that penetrates a building's façade based on several inputs, such as building geometry, glazing percentage, and average historical sunny/overcast information, and allows the user to carry over the daylighting information into the energy model directly. It also allows the user to locate daylighting sensors within the space.
Compared with a standard building with daylight dimming, the lighting designers needed to understand four different scenarios. Each iteration answers the following:
* What is the difference in lighting energy consumption without daylighting controls (minimally compliant with ASHRAE Standard 90.1-2007)?
* What is the difference in lighting energy consumption if the building were minimally compliant with ASHRAE Standard 90.1-2010?
* What is the difference in lighting energy consumption for the same building in a different location?
* What is the difference in lighting energy consumption when selecting glazing with a greater ability to transmit light?
With the understanding that it is impossible to discuss these questions under every scenario of climate, building...