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<p class=MsoNormal>Hello,<o:p></o:p></p>
<p class=MsoNormal>I am curious of others’ experiences with the
USGBC/GBCI in terms of modeling review of the baseline system selection for
EAc1 under LEED 2009 (v3) using ASHRAE 90.1-2007, Appendix G. I am
currently modeling a roughly 25,000 square foot, 2-story building to be used
for light commercial and retail space. The building is pursuing Core
& Shell certification and will house multiple tenants. The HVAC
system for the proposed building will be packaged roof top units with natural
gas-fired furnaces and DX cooling. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>As per Appendix G, the HVAC system for the baseline building
is determined by size and number of stories as follows:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Nonresidential and 3 floors or less and < 25,000
s.f. = System 3 (packaged RTU, constant volume, DX cooling, fossil fuel furnace)<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Nonresidential and 4-5 floors and < 25,000 s.f. OR 5
floors or less and 25,000 – 15,000 s.f. = System 5 (packaged VAV with
reheat)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>My building is 2-stories and just barely over 25,000 s.f.
(maybe 25,800 s.f. tops). I would much prefer to model the baseline as
System 3 as this would more closely resemble the proposed building and provide
a more realistic means of comparison. Under Table G3.1.1A, it states that
“where attributes make a building eligible for more than one baseline
system type, use the predominant condition to determine the system type for the
entire building.” How is the predominant condition determined?
Can I claim that the height of the building (2 stories) is more important than
the square footage? Or will the USGBC/GBCI require that I use System 5 as
the baseline because I’m even one square foot over the 25,000
threshold? <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Any input from others in a similar predicament would be most
appreciated.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thank you,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><i>Cara Martin, </i><span style='font-size:10.0pt'>LEED AP BD+C</span><i><o:p></o:p></i></p>
<p class=MsoNormal><b>Novus Engineering, P.C.<o:p></o:p></b></p>
<p class=MsoNormal><b><span style='font-size:10.0pt'>25 Delaware Ave.<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:10.0pt'>Delmar, New York 12054<o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:10.0pt'>518.439-8235<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>518.439-8592 (fax)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>CMartin@novusengineering.com<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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