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NC-2009 EAp2:Minimum Energy Performance

All electric Residential Building

Hi, we are working on a residential project. The heating source of the project would be electric, so the baseline system should be System 2, Packaged terminal heat pump. On the other hand one of the notes of table G3.1.1A states 'For all-electric buildings, the heating shall be electric resistance'. Does this note apply to residential projects too? Can we model the heating as electrical resistance? We checked if more detail is provided in the User's Manual, but this point is still not clear for us. Do you have any experience on modeling residential baseline system as electrical resistance? Thank you in advance!

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Anthony Hardman
Building Performance Analyst
The Green Engineer
LEEDuser Premium Member
11 thumbs up

Fri, 01/30/2015 - 15:30

Your initial assumption is correct. An all electric building would be compared to a System 2 (PTHP) baseline. The "electric resistance" note you reference is more clearly spelled out in 90.1-2010 in reference to laboratory buildings. Admittedly, the way the note is formatted is more confusing in 90.1-2007.

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