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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Chris,<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'>While you’ll not be permitted to remove the cooling system
for the proposed building in the PRM analysis, you can design and operate the
building and systems as mixed-mode such that the cooling system never runs. The
catch is that you must use the same setpoints at any given simulation time step
for both proposed and baseline buildings. Thus, if your mixed-mode control strategy
would raise the cooling setpoint when the outdoor ambient temperatures are
elevated—<i>e.g.,</i> to allow the occupants to get whatever benefit they
can from opening the windows, stored cooling from thermal mass, etc.—you
would need to use the same reset strategy (<i>i.e.,</i> tracking the OA
temperature) for the cooling control set points in the baseline building. Ultimately,
the building owner will then have to approve of the number of hours your model
indicates the building will operate with elevated cooling set points. <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'>Best,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Timothy <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>
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column;mso-element-left:-4.5pt;mso-height-rule:exactly'><b><span
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height=55 id="Picture_x0020_1" src="cid:image003.jpg@01CB2F2E.735C21D0"
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column;mso-element-left:-4.5pt;mso-height-rule:exactly'><b><span
style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:#365F91'>Timothy
Moore</span></b><b><span style='font-size:13.0pt;font-family:"Calibri","sans-serif";
color:#365F91'> </span></b><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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</span></b><b><span style='font-family:"Calibri","sans-serif";color:#365F91'>Special
Projects</span></b><b><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#365F91'> <o:p></o:p></span></b></p>
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color:#1F497D'><a href="mailto:timothy.moore@iesve.com"><span
style='font-size:8.0pt;color:#365F91'>timothy.moore@iesve.com</span></a></span><span
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**Design, Simulate + Innovate with the <Virtual Environment>**</span><span
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#365F91'><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'><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'><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'><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>
<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 11:24 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:image004.png@01CB2F2D.8D7AF330"
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>
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<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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