Knowledgebase: Shading/Daylighting
Why isn't my lighting energy being reduced with a daylighting system?
Posted by - NA -, Last modified by Linda Lawrie on 28 July 2009 12:26 AM
Q: I am trying to model a daylighting system, but I am not seeing an effect on the electric power consumption. I have moved my reference points to locations where they will see the variation in daylight. I have also run the file with the electric lighting dimming control "continuous" (1). But I still don't observe any change in the lighting electric power consumption. I am not able to figure out the exact problem. Is there some other connection between lighting control and lighting electric consumption that I am not aware of?

A: One of the problems is somewhat subtle. In the LIGHTS input object, Fraction Replaceable must be set to 1.0 in order for electric light dimming due to daylight to take effect. This is documented in the I/O reference, and also a warning is generated in the ERR file. However, this is not always
obvious to users. Check that the Fraction Replaceable is set to 1.0.

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