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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I am currently doing a naturally ventilated building for LEED
and I believe that if the space is achieving indoor temperatures between the
given set point using natural ventilation than the mechanical system energy is
0 for the proposed design. Any hours where natural ventilation can’t
achieve indoor temperatures within the set points, a mechanical system needs to
be modeled even if there isn’t one in the proposed building. This helps
keep the unmet hours within the requirements for LEED.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Cheers,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img width=591 height=170 id="Picture_x0020_1"
src="cid:image001.png@01CB2F0F.A7918D60"
alt="Christie Rimes,
Building Simulation Analyst
WSP Flack + Kurtz
405 Howard Street, Suite 500
San Francisco, CA 94105
Direct: 415.402.2727
Main Tel: 415.398.3833
Fax: 415.433.5311
website: http://www.wspfk.com
vCard: http://vcards.wspfk.com/vcardloader.php?filename=flackkurtz-christie-rimes-wspfk-com-1255981339.vcf
image: "><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Chris<br>
<b>Sent:</b> Thursday, July 29, 2010 11:13 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] LEED & Natural Ventilation<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><span style='font-family:"Comic Sans MS";color:#000066'>All,</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-family:"Comic Sans MS";color:#000066'>we
regularly design and model buildings which rely in part on natural ventilation
as a source of free cooling. The issue we are often faced with is how to
capture this benefit when performing a LEED Appendix G analysis. Appendix G
states that all conditioned spaces must have BOTH heating and cooling. We would
like to remove mechanical coolig in the proposed design building and thus gain
benefit when comparing to the mechanical cooling system in the reference
baseline building.</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-family:"Comic Sans MS";color:#000066'>Has
anyone tackled this issue and come to a satisfactory resolution? </span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-family:"Comic Sans MS";color:#000066'>Thanks
for your help.</span><o:p></o:p></p>
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<p class=MsoNormal><br clear=all>
<br>
-- <br>
Chris Flood BSc (Eng)<br>
Senior Building Analyst & Energy Modeller<o:p></o:p></p>
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