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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>My firm has received credit for MMV in a LEED project by utilizing
a custom calculation. This was entered in as an Exceptional Calculation Method
(ECM) in the LEED template . <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'>We first created an additional VAV system serving all of the
spaces that would be included in the MMV scheme. We then had eQUEST spit out an
hourly report of the fan, heating, and cooling energy for this system, as well
as the ambient exterior air temperature. <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'>For this particular project, the building automation system will
signal the occupants when the outside temperature is “appropriate” for
natural ventilation and shut down the HVAC system in the perimeter spaces. It
is then up to space occupants to open windows to allow for ventilation and
conditioning. Thus, we took the hourly output spreadsheet and zeroed out
the fan, heating, and cooling energy for occupied hours in the natural
ventilation temperature range. The interior spaces were left on a separate VAV
system that remained on during all occupied hours. We took the energy savings
calculated from this spreadsheet and applied it to the total energy usage from
the proposed run when all the spaces were served by a single VAV system. <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'>The major inaccuracies of this approach are that we have modeled
separate VAV systems for MMV and traditionally conditioned spaces, when in
reality there is one system and the individual fanboxes are shut down (there is
also static pressure reset on the VAV system, so there should be at least some
savings on the central fan in reality). Additionally, the spaces are modeled as
though they are conditioned rather than allowing their temperature to float during
natural ventilation mode. <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'>The LEED reviewer accepted this methodology without any comments.
(They did make me change my roof from U = 0.064 to U = 0.063 for the baseline
case, which tells you the areas the reviewers tend to fixate on. Anyway, that
is a different discussion.)<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><span style='font-family:"Franklin Gothic Demi","sans-serif";
color:#1F497D'>Nathan Miller</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;color:#1F497D'>Senior
Energy Engineer/Mechanical Engineer<o:p></o:p></span></i></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>direct:
206.788.4577<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>fax:
206.285.7111 </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p></o:p></span></p>
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<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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<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"'>
equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Kevin Luoma<br>
<b>Sent:</b> Sunday, December 13, 2009 8:14 PM<br>
<b>To:</b> Equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Mixed-mode natural ventilation<o:p></o:p></span></p>
</div>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-family:"Tahoma","sans-serif";
color:#00007F'>All,<br>
<br>
I was wondering if anyone has had success incorporating mixed mode natural
ventilation into their ASHRAE 90.1 baseline model and submitting it to the
USGBC. I am currently using it in my building mechanical system and would
like to take advantage of the energy savings.<br>
<br>
Thanks for the help.<br>
<br>
Regards,<br>
<br>
Kevin Luoma<br>
<br>
<br>
<o:p></o:p></span></p>
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