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NC-2009 EAp2:Minimum Energy Performance

Energy modeling - Adjacente building

Hi, I have a doubt when modeling proposed and baseline building. If I have some adjacent buildings to the proposed model, should I include their geometry in the proposed/baseline model, in order to account for the shading effect? Thanks. Luana

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

Wed, 11/07/2012 - 17:48

You are not required to model adjacent building in the 90.1-2007 version. In 90.1-2010 you are required to model them identically. Just because you are not required to do so does not mean that it isn't a good idea. For the sake of accuracy we certainly would model adjacent buildings or landscape features that would influence the energy use of the building.
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Jean Marais
b.i.g. Bechtold DesignBuilder Expert
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Thu, 11/08/2012 - 06:28

Very interesting...I was once told by my reviewers to cut out my surrounding buildings and (in that project) large trees which were in both models (a pitty for all the background research and modelling of that kind of tree species for shading effect). At the end of the day it is a energy usage comparison, so shouldn't make so much difference, unless you didn't shade certain parts with external blinds because there happens to be a huge tree in the way.
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Marcus Sheffer
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7group / Energy Opportunities
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Thu, 11/08/2012 - 18:49

Yep Jean compliance models, like the one required for LEED, are for comparing the building design to a uniform baseline so as long as they contain some of the same assumptions the relative difference is minor. Improving the accuracy of the modeling results is sometimes a related but not always consistent objective when doing a compliance model strictly according to the rules.

Tue, 09/10/2013 - 18:36

Hi, I have another question related to adjacent buildings. In my post above, I asked if I should include an adjacent building in the Proposed/Baseline models due to the shading effect. My doubt is: if a have an attached building to the building under certification process, should I model it in order to take into account not only the shading effect but also the thermal effect?
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 09/10/2013 - 18:40

You do not need to model the adjacent building to account for the thermal effect. Simply model the wall connecting the two buildings as adiabatic assuming the temperatures are about the same on both sides.

Tue, 09/10/2013 - 18:47

Ok. Thank Marcus!

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