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NC-2009 EAp2:Minimum Energy Performance

Effective Daylit Zones

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Maya Karkour
EcoConsulting
LEEDuser Basic Member
549 thumbs up

Dear All, I want to model daylighting sensors for an open plan office. I read in this forum that the daylighting sensors are effective next to the external windows (within a ~1.5 x the window height distance). Now when it comes to energy modeling, do you need to separate the perimeter zones from the core zones of the office? Is it fine to model daylight control sensors for the whole office (modeled as one zone), or should I only model daylighting in perimeter zones? In theory the daylight sensor should sense the lighting levels and accordingly adjust the space lighting (by dimming) of the whole office to achieve the desired lux levels (500 lux for offices). Any thoughts are greatly appreciated! Thanks

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 07/31/2013 - 15:00

How you model daylighting is very software specific. In general you will need to place sensors in the same location as in the design. If only a portion of the lighting in a zone is controlled then you enter that information. It certainly does not make sense to spend the money for dimming ballasts and controls for fixtures outside the daylit areas.
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Maya Karkour
EcoConsulting
LEEDuser Basic Member
549 thumbs up

Wed, 07/31/2013 - 15:10

Thanks Marcus, that is logical. The problem comes when you don't have an actual design and you're requiring future tenants to install daylighting sensors through a legally binding agreement. As for the software I'm using (TAS Software), I don't have the option of "placing sensors here and there". The way it works is that when entering the Lighting Power Density for a zone, you have the option of either entering a constant value, or a "function" which varies the Lighting Power Density for the whole zone depending on the AVERAGE daylighting level in the space. I guess the software methodology is not too accurate then..
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 07/31/2013 - 15:57

So just require the tenants to install dimming ballasts and sensors in the daylit zones. As far as the software issue I would see if they have some sort of work around for that limitation. Maybe the way you set up your zones?

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