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 Fellow7group / Energy Opportunities
LEEDuser Expert
5867 thumbs up
January 17, 2016 - 3:32 pm
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.
Nicolas Martinez Ochoa
Energy ConsultantSIMGEA
5 thumbs up
January 19, 2016 - 3:19 pm
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.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5867 thumbs up
January 20, 2016 - 12:54 pm
You have to model it in the box with reheat.