Colleagues,

I am working on a 90.1 Appendix G model of a 5-story mixed-use
building. The bottom two floors are commercial spaces, the top 3 floors
are residential. There is an underground parking garage as well, which I
have considered to be part of the residential use). The building is
heated by a combination of gas and electricity; gas use predominates. By
floor area the building is predominantly residential. However, about 62%
of the building's total energy use is associated with the commercial
parts. Because of the way that energy use breaks down I am leaning
toward considering the building to be non residential, using System 5 as
the baseline and taking exception G3.1.1 a (system 3) for the
residential spaces. If anyone has experience with such buildings and
could share their thoughts on the validity of my interpretation, I would
greatly appreciate it.

kind regards and my thanks in advance

David

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David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com