Dear all,
I am trying to model the use of two daylight controls in an industrial storage building with few windows and skylights with only 20% of transmittance. The daylighting is about 6,3% however when modelling the use of illuminance controls, the reduction of interior lighting is not coherent with daylighting results since it considers about 8 hours reduction of interior lighting. I think that these results are related to the way that the simulation software calculates the use of lighting controls, that does not consider the real transmittance of the glazing used. In this case, should I present the results obtained, but try to justify why they are not reliable? If so, how can I calculate the percentage of reduction of interior lighting?
Thank you in advance!
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
March 31, 2014 - 9:35 am
If the space is heated and/or cooled you will have to include the daylighting control within in modeling software to account for the interactive effects. If there is no heating or cooling then you could do the calculations outside the modeling software. Either way you would need to do an exceptional calculation.
What software are you using?
Isabel Santos
ECOCHOICE SA2 thumbs up
March 31, 2014 - 1:14 pm
Thanks Marcus.
I am using Design Builder v3.4.0.039 (Energy Plus v8.1). We don't have any heating or cooling in the space. Can you advise any calculation method that we could use?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
March 31, 2014 - 2:04 pm
That software definitely accounts for the glazing visible light transmission. The calculation methodology used within EP would also be acceptable for LEED. I would not use something else, I would use EP. Perhaps there is an input error? You could contact the EP help desk for more specifics.