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NC-2009 EAp2:Minimum Energy Performance

Defining Boundary for Energy Performance

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Ralph Bicknese
Principal
Hellmuth & Bicknese Architects
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For a renovation and addition to an existing college campus library, we are in the process of determining the boundary to use for energy performance. The existing building is 182,738 SF. The total renovated building with additions will be 200,556 SF and the total area to include renovations and additions is 39,122 SF which equals approximately 19.5% of the entire building when complete, with the remaining 80.5% being outside of the project scope. Can the base case energy model just include the area to be renovated (modeled on ASHRAE 90.1 prescriptive requirements)? Can the design case energy model just include the renovated areas and additions (as designed)?

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
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Mon, 08/31/2015 - 15:33

The models need to include the area of the project that aligns with the LEED project boundary. Both models would need to include the renovated and added areas. It can get tricky depending on the HVAC systems. Will there be separate systems serving the renovated and new areas? If there is HVAC overlap it can get very messy. The renovated area can include the existing envelop parameters but the other systems are the Appendix G requirements.
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Ralph Bicknese
Principal
Hellmuth & Bicknese Architects
LEEDuser Premium Member
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Wed, 09/02/2015 - 15:14

Great, thank you for your suggestions Marcus. For clarification, with regards to your last sentence, we wanted to confirm that this applies to the base case and that any differences in the design case would be modeled as designed?
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Wed, 09/02/2015 - 15:22

Yep the baseline is according to Appendix G and the proposed is modeled as designed.

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