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<p class=MsoNormal><span style='color:#1F497D'>Here are a couple of other items
to check when modeling ERVs in eQuest.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<ol style='margin-top:0in' start=1 type=1>
<li class=MsoNormal style='color:#1F497D;mso-list:l0 level1 lfo1'>If the system
does not have dedicated fans, manually set the pressure drop across your
recovery unit? The default pressure drops on the supply and exhaust
sides are pretty high. If there are dedicated fans, make sure the
actual fan power is entered.<o:p></o:p></li>
<li class=MsoNormal style='color:#1F497D;mso-list:l0 level1 lfo1'>Depending on
the make-up air temperature control method and system design, check the
capacity control setting. If the design does not bypass the recovery
section when it is not in use, the parent HVAC fans must overcome that additional
pressure drop during all operating hours.<o:p></o:p></li>
</ol>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Also, right clicking on an input
field and choosing “Item Help” will provide a good amount of
information as to how eQuest accounts for each input.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Good Luck! ERVs can be
tricky sometimes.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='color:#1F497D'>John T. Forester, </span><span
style='color:#568E14'>LEED AP BD+C</span><span style='color:#1F497D'><br>
Demand Management Institute<br>
35 Walnut Street<br>
Wellesley, MA 02481<br>
Phone: 781 431 1100 x14<br>
Fax: 781 431 1109<br>
email: <a href="mailto:jforester@dmiinc.comweb">jforester@dmiinc.com</a><br>
web: <a href="http://www.dmiinc.com/">www.dmiinc.com</a><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Charles
Land<br>
<b>Sent:</b> Thursday, January 07, 2010 10:48 AM<br>
<b>To:</b> Walson, Kristy; 'equest-users@lists.onebuilding.org'<br>
<b>Subject:</b> Re: [Equest-users] Modeling ERV's in Equest<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>What is the climate like?
If you have a lot of cooling hours where the outside air temperature is lower
than the space temperature it will hurt your cooling. For example, if it
is 60 outside and your building is calling for cooling. With a 74 degree
space temperature, if your running your ERV your actually raising the outside air
temp to lets say 65 then cooling it back down. One way to help this out
is to set your ERV to run “when minimum outside air” rather than
“when fans on”. This will allow the unit to economize.
You can then continue to play with the controls until you get the best savings
out of it. If the units cant economize you can also set the ERV to run
based on outside air delta t’s or delta h’s. You can
also set the ERV to put off a particular temperature, such as 55. I believe you
can set both a cooling and a heating temp. You will then have to
choose the method of either bypassing air or modulating the wheel speed to give
you your specified leaving air temperature.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Hope this helps.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Walson,
Kristy<br>
<b>Sent:</b> Thursday, January 07, 2010 8:15 AM<br>
<b>To:</b> 'equest-users@lists.onebuilding.org'<br>
<b>Subject:</b> [Equest-users] Modeling ERV's in Equest<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi all,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>We are using Equest to model a 500,000 sq ft federal prison
facility. More than half of the AHU's have energy recovery, so we modeled
this at each applicable unit. When we run the model with ERV's vs. the
model with no ERV's, it appears as though the ERV's are actually hurting us on
the cooling energy. Is there a quirk when modeling ERV's in Equest (much
like the bug fix in the Advanced Edit section of VisDOE)? Does anyone
have any suggestions, or has anyone run into a similar problem before? <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks in advance for the advice...<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>P.S. Kim - are you happy I'm finally asking a question about
Equest?? :)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><b>Kristy M. Walson, PE, LEED AP<o:p></o:p></b></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;color:#333333'>Mechanical
Engineer / Sustainable Design<o:p></o:p></span></i></p>
<p class=MsoNormal><span style='font-size:10.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><b><span style='color:#006363'>TLC Engineering for
Architecture<br>
</span></b><b><span style='font-size:10.0pt;color:#006363'>Your Architecture
2030 Partner</span><span style='color:#006363'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:10.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>255 South Orange Avenue,
Suite 1600<o:p></o:p></span></p>
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