FAQs about EAp2 :

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?

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?

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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Modeling Refrigerant Economizer for Data Center - proposed model

Hi, We have an office building and it's data center room has a DX cooling with refrigerant economizer. Per the manufacturer's guidelines the approved performance compliance with T24 is by modeling a basic efficient chilled water plant with an integrated water economizer; as per the directions in page 6 in the following link: https://www.vertivco.com/globalassets/products/thermal-management/room-cooling/analysis-of-pumped-refrigerant-economizers.pdf. The plant inputs had to be assumed as in reality there is no chiller plant serving the building. Our project is going for LEED using EnergyPro and i would like to have your inputs on the following: 1) Would the same approach work for 90.1 compliance - LEED? 2) Upon an online search I've found a few references to projects that have used the same systems for their data centers, thus no specific modeling references were mentioned for compliance with LEED. Do you have any references of projects that have used similar systems? 3) Any other recommendations on the modeling approach/references/guidance. Thank you, Kind Regards, Maria

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Wed, 07/19/2017 - 14:41

1. Yes it should work. What you are describing is a work around. This requires you to follow G2.5 as an exceptional calculation. So provide a copy of the document in your LEED submission along with a narrative explaining what you have done. 2. I am not aware of any. 3. You should check out this spreadsheet in conjunction with your efforts to show savings. It may help you establish a reasonable baseline if you are trying to show savings associated with this system. https://www.usgbc.org/resources/minimum-energy-performance-data-center-calculator

Tue, 02/05/2019 - 20:27

Marcus, can you provide some insights on NC 2009, with this on Prereq, between the  Minimum Energy Performance for Data Center spreadsheet, the Minimum Energy Performance Calculator (MEPC) excel calculator, .. can a project still comply without using software to develop an energy model?  Or can the project comply with using either of these two spreadsheet calculations?

Tue, 02/05/2019 - 20:56

So the MEPC for data centers contains a tab that you can use to calculate savings relative to an approved baseline for the IT portion of a data center. The regular MEPC is used to document the energy modeling inputs and the results. The only significant difference is that one deals directly with data centers and the other does not. Neither one is primarily a set of spreadsheet calculations. They both are primarily a document used to summarize the inputs and results of your energy model. They are not a substitute for an energy model. Projects must use energy modeling software that qualifies under Appendix G Section G2.2.

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