FAQs about EAp2 :

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?

The Section 9 space-by-space method does not include residential space types. What should I use?

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?

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Forum discussion

CS-2009 EAp2:Minimum Energy Performance

Identical fan power?

We have a comment back from GBCI, stating: 1. The Baseline fan power calculations and the SV-A reports for the Baseline model indicate that the exhaust fan systems (xxx1 and xxx2, as indicated in the mechanical schedules provided for PI Form 4: Schedule and Overview Documents) have not been modeled identically in the Proposed and Baseline cases. All independent fan systems of the HVAC systems in the actual design must be modeled identically between the Proposed and Baseline models at actual equipment capacities (fan volume and fan power) as required by Table G3.1.10 in the Proposed building column, since the fan design air flow rates and fan power per Sections G3.1.2.8 and G3.1.2.9, respectively, only applies to system types 1 through 8 in Table G3.1.1A. Revise the Proposed and Baseline model so all independent fan systems of the HVAC systems are modeled identically between the Proposed and Baseline model. In addition, provide revised SV-A reports for the Proposed and Baseline model reflecting the changes. I have no idea what they are talking about! This space has a packaged unit serving it for basic ventilation and heating/cooling. It also has a supply fan (with exhaust louvers) for ventilation when a vehicle is inside idling. The supply fan has been modeled as an exhaust fan with the package unit, which seems a reasonable way to work within the confines of Equest. However, I don't know what the modeler is saying. I've seen similar comments from reviewers on various forums, but not really ever found out what the bottom line was. I don't think the supply (exhaust) fan should be modeled the same (fan power) in baseline and proposed, but I recall seeing somewhere that perhaps App G3.1.2.9 might not apply to that fan since it is not a typical tempering fan. Or is this the case? Are they just saying that they are confused about seeing a supply fan on the plans, and seeing an exhaust fan in the model? That doesn't seem too difficult to figure out. Help! I've spent a bunch of time on this and now am questioning many of my conclusions. Thanks

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Tue, 06/26/2012 - 13:50

You can send clarifying questions to be answered by the GBCI reviewer. http://www.gbci.org/org-nav/contact.aspx Sometimes a clarifying explanation clears things up for the reviewer. If the fan in question is indeed a supply fan then an explanation may be needed. Independent exhaust fans are supposed to be modeled in the Baseline identical to the Proposed design.

Tue, 06/26/2012 - 14:28

Thank you Marcus. Can you point me to any guidance regarding the modeling independent exhaust fans? I've not located anything so a bit surprised by this.

Tue, 06/26/2012 - 16:32

As with many issues you need to connect the dots within 90.1. Exhaust fans associated with the Baseline HVAC system are already included in G3.1.2.9. Table G3.1-1 Proposed (a) lists exhaust fans as separate from the HVAC systems and I know of no where else in the standard where independent exhaust fans (not part of a heating/cooling system) are regulated. Table G3.1-12 Baseline indicates that miscellaneous loads should be modeled as identical to the proposed.

Tue, 06/26/2012 - 20:06

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