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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

LEED NC 2009 Documentation

Hello,

For a LEED NC project, should construction EN documents be the baseline for input of all energy model inputs given that the model is best to be completed during the design phase of the project? And two, in general how much should data from approved cut-sheets, as shop drawing or as-builds be used as part of the prereq and credit supporting documentation submittal?

Am just overwhelmed from all these sources of data, and would like understand what best practices are recommended by LEED or have been used in other projects. Thank you for your help

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 02/05/2019 - 17:09

In general no matter when you complete the energy model it should be based on the final construction. This is the most accurate prediction and therefore the most accurate assessment of energy savings. That said there are some issues with this in LEED. If you do a combined submission the final model should be based on the final construction, not the final design. If you do a split submission your models are based on the design documents. Technically you are supposed to change the models if something happened during construction that would change the modeling results to any significant degree. However, this is not really enforced so most projects do their models based on the design documents and then do not update them based on changes during construction. Best practice would be to model the project as accurately as possible based on the final construction which is not really required by LEED.

Tue, 02/05/2019 - 18:00

This is super helpful Marcus, thank you. Given our combined submission, it makes sense that am running through this process of changing the model to reflect field conditions during construction. I'd be able to share with team as well the implications time demand, details of updating model as the project progresses with combined submission.  This will help with early decisions on modeling requirements/needs and project registration/submission choices. 
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 02/05/2019 - 18:26

In LEED v4 there are some early design phase energy analysis requirements that are not required in LEED 2009. Here is a tip sheet on the subject that was recently posted in LEED User - https://leeduser.buildinggreen.com/tipsheet/design-phase-energy-modeling-leed 
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 02/05/2019 - 19:01

https://leeduser.buildinggreen.com/tipsheet/design-phase-energy-modeling-leed

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