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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?

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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?

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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?

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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Exceptional Calculations

Stephen DeGrazio

LEEDuser Basic Member

1 thumbs up

June 11, 2013

I have a new bubilding which will be mostly a performing arts theater and school gymnasium. Because these two spaces make up well over half of the building, my annual proccess energy costs are not greater than or equal to 25% of the total energy costs for the proposed design. In fact they are only 9%. Do I need to use an exceptional calculation or can I write a narrative explaining that the type of building I have would never have the amount of process loads needed to achieve the 25%? If I need to us an exceptional calculation does anyone have any suggestions of how to accomplish this?

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Amy Boyce

Manager, LEED

USGBC

LEEDuser Premium Member

26 thumbs up

Wed, 06/12/2013 - 17:57

Not all projects will have at least 25% process loads; that number is simply representative of a "typical" amount. If your project has less, indicate through a narrative why that is so. Exceptional Calculation Methods are for claiming savings from the process loads, and are necessary when the percent process load differs between the baseline and proposed models.

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