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CS-2009 EAp2:Minimum Energy Performance

Heating System G3.1.10 ( c )

Hello, I’m working on a Core & Shell office building in Bogota and the baseline system is 8. The building has a central cooling system with chillers and air handle units in each floor, it doesn’t have a heating system. According to the G3.1.10 (c) table of ASHRAE 90.1, the proposed model must have a heating system equal to the baseline, ie electrical resistance and parallel fan-powered boxes (PFP). I don’t want to model PFP boxes in the proposed model due to the fan power consumption. I don’t want neither to model a lower heating temperature setpoint because the fan in the PFP box would be working all the time. To meet the baseline heating system, Can I use only an electric resistance in the air handle unit or placing a simple reheater in the zone enough? Or is necessary to model PFP boxes with a heating coil in each zone? Thank you.

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

Sun, 01/17/2016 - 20:32

If you follow this path you have to model the proposed identical to the baseline. You can't choose to model it a different way that would be to your advantage. Personally I would just explain to the reviewer that you have not modeled a heating system while demonstrating that a heating system would not result in any heating energy use. If you can do that as a reviewer I would be OK with you not modeling a heating system as it represents a more accurate prediction of future energy use.

Tue, 01/19/2016 - 20:19

Thank you Marcus. In system 8, heating system for the baseline uses an electric resistance. My question is, Can I model the heating system using only an electric resistance in the AHU?, Or the only way for modeling the heating system is including a PFP box with reheat?. Thanks.
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 01/20/2016 - 17:54

You have to model it in the box with reheat.

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