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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I agree with Karen. Appendix G is pretty clear that
ventilation rates should be identical in both cases unless the proposed case is
using DCV, and there is an implied understanding that the proposed OA rates
meet code, whether that be 62.1 or the applicable local code. Some people
make the mistake of using the same percentage of outside air in both cases, but
it’s the flow rates that need to be identical, not the percentage. I
find that this usually requires entering a CFM at the zone level, particularly
for multi-zone systems, and the elevation factor needs to be applied if the
project is not at sea level (that is, if you want output reports to match the
design documents exactly).<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'>With respect to the review comment, I would just hold your
ground and follow your (correct) interpretation of Appendix G. I’ve
had conflicting review comments on previous projects, too. Sometimes the
reviewer is simply misinformed.<o:p></o:p></span></p>
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<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"'> Karen Walkerman
[mailto:kwalkerman@gmail.com] <br>
<b>Sent:</b> Wednesday, February 24, 2010 8:57 AM<br>
<b>To:</b> Tomlinson, Scott<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Outside airflow (eQuest Users group)<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>I have always sized the outdoor
air to be the same in the proposed and baseline buildings. There is a
section in Appendix G that specifically directs the modeler to do this. I
have had a number of buildings approved using this method.<br>
<br>
--<br>
Karen<o:p></o:p></p>
<div>
<p class=MsoNormal>On Wed, Feb 24, 2010 at 9:06 AM, Tomlinson, Scott <<a
href="mailto:stomlinson@smma.com">stomlinson@smma.com</a>> wrote:<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Thank
you to those who helped with my previous outside air question. I now
understand how the outside air is controlled, I’m just not sure how I
should be setting it. ASHRAE 90.1 – 2004 dictates that the minimum
outdoor air ventilation rates should be the same for the design and baseline
building, but one of our LEED review comments is that our baseline model should
be modeled base on ASHRAE 62.1 – 2004 requirements. It seems that
if I let eQuest size my OA based on ASHRAE 62.1 I won’t match my design
building OA rates (in this case, 100%). Also, if I let eQuest size my OA
based on the 100% OA rate of my design building I will be over ASHRAE 62.1
requirements. <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>What
method of outside air sizing have y’all been using for your models, and
have you been approved by USGBC with the method?<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p>-<span style='font-size:7.0pt'>
</span>Thank you,<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
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