See all forum discussions about CS-2009 EAp2
 Subscribe to new posts about CS-2009 EAp2 Post a new question aboutCS-2009 EAp2
See LEEDuser’s guidance on CS-2009 EAp2»
FAQs about EAp2 :

Can the Passive House Planning Package (PHPP) be used to energy model for LEED?

Is it acceptable to model a split-type AC with inverter technology compressor as a heat pump, like modeling VRF?

Can the Trace 700 'LEED Energy Performance Summary Report' by uploaded to LEED Online in lieu of the Section 1.4 tables spreadsheet?

A portion of our building envelope is historic. Can we exclude it from our model?

Which baseline HVAC system do I use if my building has no heating or air conditioning?

For an existing building, do I need to rotate the model?

Our project has a diesel backup generator. Should we include it in our energy model?

Our project has a large process load—75%. Despite our efforts to make an efficient HVAC design, the cost savings are minimal. What can we do to earn this prerequisite and be eligible for LEED certification? Is there any flexibility in how we model the p

Can SHGC be higher in the proposed than in the baseline model?

Our process load is higher than 25%. Do we have to justify that?

Do I need to justify the electrical and fuel rates I am using in my model?

Our local code references ASHRAE 90.1-2010. Should I use that for my documentation, or 90.1-2007?

Can I claim exterior lighting savings for canopy lighting even though a baseline model cannot include shading elements?

The project is built on a site with existing exterior lighting installed. How should this be accounted for?

Can mezzanines open to floors below be excluded from the energy model?

How do I provide a zip code for an international location?

For a project outside the U.S., how do I determine the climate zone?

For a project outside the U.S., how do I determine the Target Finder score?

Do hotel rooms need automatic light shut-off control?

How commonly are the 90.1 mandatory compliance forms submitted as part of EAp2/EAc1?

View answers »

Forum discussion

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.

0
Post a reply

You rely on LEEDuser. Can we rely on you?

LEEDuser is supported by our premium members, not by advertisers.

Go premium for $15.95  »

Profile picture for user sheffer
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.

Add new comment

To post a comment, you need to register for a LEEDuser Basic membership (free) or login to your existing profile.