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NC-2009 EAp2:Minimum Energy Performance

Daylight dimming with manual electric curtain

My project has a dayligh dimming system and alos the curtain of each window. The reviewer ask me to add the effect of how this curtain will be modeled. Normally this curtain will be operated by the building operators and will be pull down only if the direct sun causing glare. Can we write the narrative this way and maintain the original energy model without any window curtain? If not, how should we model the curtain? Thanks

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

Mon, 03/30/2015 - 18:27

Interior shades must be automatically deployed to claim any savings. If they are manually deployed you cannot claim any savings. Operated by building operators is manual (even if the curtain deploys with a motor). You can model the curtain properties in some software. It gets scheduled like everything else. It is modeled identically unless it is automatically controlled with a sensor.

Tue, 03/31/2015 - 01:15

The reviewer seems focusing on the visual transmittance reduction. So, should we just apply the schudule of the interior blind for the PROPOSED MODEL? For the baseline, visual transmittance has no impact on energy consumption.
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 03/31/2015 - 14:25

There is the visual transmittance of the glass and also the transmittance of the blinds. Agree that in the baseline the energy use would not be impacted. The blinds must be modeled identically in both models unless there automatic controls for the blinds. If there is automatic controls you should provide an explanation for how your schedule reflects the operation of the controls.

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