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NC-2009 EAp2:Minimum Energy Performance

Exception b. of G3.1.1 and outdoor ventilation

I’m modelling a System 5 for a baseline model. Exception b. of G3.1.1 states: “use separate single-zone systems (..) for any spaces that have occupancy or process loads or schedule that differ significantly from the rest of the building”. Is outdoor air not considered? I mean, consider a proposed building where at a floor some spaces are mechanically ventilated and some spaces aren’t. If in the baseline model all the spaces are connected at the same AHU, then outdoor air is delivered to all the spaces. Is it acceptable?

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

Thu, 11/06/2014 - 21:52

The ventilation rates must be identical in both models. Ventilation method is not covered by exception b. Not sure if exception c would apply to your situation?

Fri, 11/07/2014 - 08:40

Exception c doesn't apply. Do you mean ventilation rates must be identical for the whole system/AHU? If you meant for every single zone, it would be problematic (impossible?).
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 11/07/2014 - 14:43

Yes identical at the system level.

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