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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:red'>“Each model that I've done for LEED utilizes the same ventilation
rates between the proposed and design; whether it was ASHRAE 62.1 or IMC 2003;
however, the occupancy schedules changed in spaces where DCV was installed.”<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'>Ron, that’s an interesting statement in itself –
modifying occupancy schedules has an impact on the mechanical cooling (not just
the cooling associated with reduced ventilation air), which isn’t really
fair. Was that approved by GBCI? If so, I guess it’s further
proof that there is still a lot of inconsistency in the review of EAc1. <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'>Karen, I think your letter does a good job of requesting an official
“ruling” from the USGBC.<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>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";
color:teal'>GHT Limited<br>
</span></b><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif"'><ns0:PersonName><span
style='color:black'>James Hansen</span></ns0:PersonName></span></b><b><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'>, PE,
LEED AP<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Senior Associate</span></b><b><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:black'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:Street><ns0:address><span
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<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:place><ns0:City><span
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style='color:black'>22201-4749</span></ns0:PostalCode></ns0:place></span><span
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color:teal'><a href="http://www.ghtltd.com/"><span style='font-size:10.0pt;
color:blue'>www.ghtltd.com</span></a><o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> <o:p></o:p></span></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><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"'> Karen Walkerman
<kwalkerman@gmail.com><br>
<b>To:</b> equest-users <equest-users@lists.onebuilding.org><br>
<b>Sent:</b> Tue, July 27, 2010 12:10:27 PM<br>
<b>Subject:</b> [Equest-users] Demand Controlled Ventilation and EA Credit 1</span><o:p></o:p></p>
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<p class=MsoNormal>All,<o:p></o:p></p>
</div>
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<p class=MsoNormal><o:p> </o:p></p>
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<div>
<p class=MsoNormal>below is a draft letter to the EA Credit 1 TAG chair.
I welcome any edits, or critiques, and if anyone would like to be a
co-signer of the letter, please let me know.<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Thanks,<o:p></o:p></p>
</div>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>--<o:p></o:p></p>
</div>
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<p class=MsoNormal>Karen<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>It has come to our attention from a posting on the eQuest
list-serve that a fellow energy-modeling professional has been asked to model
proposed design and baseline design ventilation rates differently where the
proposed design model utilizes demand controlled ventilation. We have
searched the ASHRAE 90.1 documentation as well as the LEED reference
documentation and consistently find the requirement that baseline ventilation
rates be modeled the same as the proposed design, and that credit can be taken
for demand controlled ventilation.<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>We understand that large energy savings can be gained from
demand controlled ventilation and that in certain cases, 'gaming' of the system
could result in abnormally high ventilation rates for the baseline design,
while the DCV system keeps ventilation rates low in the proposed design,
however, our main concern is that energy modelers are being made aware of
changes to guidelines during the design review process. At this stage,
the energy modeler has already completed a significant amount of work in
preparing the proposed and baseline design energy models, and all associated
documentation. Changing the baseline design ventilation rates requires
re-modeling of the building and increases the likelihood that the project will
have to challenge a 'rejected' result if the LEED reviewer is not satisfied
with the energy modeler's response and modeling changes.<o:p></o:p></p>
</div>
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<p class=MsoNormal><o:p> </o:p></p>
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<div>
<p class=MsoNormal>We feel that it may be time to develop modeling guidelines
for demand controlled ventilation, and that these guidelines should be
developed, released, and required in a similar fashion to the district energy
guidelines published by LEED for NC 2.2 Furthermore, we feel that any
changes made to EA Credit 1 energy modeling guidelines should be made with
adequate notice to the energy modeling community.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Thank you for your consideration on this issue,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>--<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Karen Walkerman<o:p></o:p></p>
</div>
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<p class=MsoNormal>Second Law<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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