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Forum discussion

CS-2009 EAp2:Minimum Energy Performance

Building Area Method used at whole building simulation

Assuming that I use the BAM for showing compliance with the minimum energy performance prerequisite do I have to use the BAM also at the simulation for EAc1? It would be more meaningful to use the values of table 9.6.1 (space-by-space) instead of the same LPD for every space types in the building. However the ASHRAE UsersManual states on page G-36 >>If the building area method is used, it must be used throughout the whole project.

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Wed, 09/05/2012 - 14:38

If you use Option 1 for EAp2 that is the method which determines the points for EAc1. So they are tied together. You do need to use the same lighting power density method in both models. We always use the space-by-space method as it is the more accurate of the two options and usually shows greater savings.

Wed, 09/05/2012 - 15:19

I'm not sure if I understood it right. If we use the BAM to show compliance with ASHRAE section 9.4, do we also have to use the BAM at the simulation?
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 09/05/2012 - 16:09

Only exterior lighting is covered under 9.4. Interior lighting is not a mandatory provision. It is a prescriptive requirement and therefore eligible for tradeoff so you do not have to meet or exceed the values in 9.5 or 9.6.

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