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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>eQuest, TAS and IES, I know can model natural ventilation. In
IES and TAS you can actually model the operation of the windows by defining
limits on indoor temperature, wind speeds etc. eQuest is a little more basic
where you can use a S-G function for infiltration which calculates higher
infiltration rates based on outside wind conditions. eQuest then calculates if
indoor temperatures will be kept between the indoor temperatures based on the
outside conditions. If yes than it will shut off the mechanical system and calculate
0 energy for that hour.<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'>Therefore in programs like IES and TAS you may be able to keep
conditions below the set point even if the outdoor temperatures are hotter due
to air movement etc. You may also want to come to an agreement with the client
to allow a slightly higher set point, however you will need to also apply this
to the baseline model. Otherwise for LEED, you can’t take account for the
hours were naturally ventilation doesn’t provide comfort. Also note that
the unmet load hours can be a maximum of 300 hours so potentially you could
take credit for 300 hours for natural ventilation even if it is above the set point.
<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'><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@01CB2F11.8BFA3050"
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"'> Chris
[mailto:floodyc@gmail.com] <br>
<b>Sent:</b> Thursday, July 29, 2010 11:24 AM<br>
<b>To:</b> Rimes, Christie<br>
<b>Cc:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] LEED & Natural Ventilation<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal><span style='font-family:"Comic Sans MS";color:#000066'>And
how did you model the natural ventilation?</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-family:"Comic Sans MS";
color:#000066'>In summer when external temperatures are above the room setpoint
natural ventilation during the day would not provide any cooling.</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>On Thu, Jul 29, 2010 at 11:19, Rimes, Christie <<a
href="mailto:Christie.Rimes@wspfk.com">Christie.Rimes@wspfk.com</a>> wrote:<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;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.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>Cheers,</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'><img border=0 width=591 height=170
id="_x0000_i1025" src="cid:image001.png@01CB2F11.8BFA3050"
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: "></span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt'>From:</span></b><span style='font-size:10.0pt'> <a
href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Chris<br>
<b>Sent:</b> Thursday, July 29, 2010 11:13 AM<br>
<b>To:</b> <a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> [Bldg-sim] LEED & Natural Ventilation</span><o:p></o:p></p>
</div>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-family:"Comic Sans MS";color:#000066'>All,</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><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>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><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>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-family:"Comic Sans MS";color:#000066'>Thanks for your help.</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><br
clear=all>
<br>
-- <br>
Chris Flood BSc (Eng)<br>
Senior Building Analyst & Energy Modeller<o:p></o:p></p>
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<p class=MsoNormal><br>
<br clear=all>
<br>
-- <br>
Chris Flood BSc (Eng)<br>
Senior Building Analyst & Energy Modeller<o:p></o:p></p>
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