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<p class=MsoNormal><span style='color:#1F497D'>James,<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'>In the past I’ve revised
the minimum flow schedule within the thermal zones and used a ratio of 0 during
unoccupied hours to make sure no OSA is being introduced and -999 ratio for
hours of occupancy. I also do the same for HVAC system. Then within
the HVAC system I change the minimum OA Method to DCV return or zonal
sensors. I think the trick is making sure the thermal zones and HVAC
systems operate on the same minimum air schedule that you specify. Hope
this helps.<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'>David Frank<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>EMP2, Inc.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><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"'> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>James
Hansen<br>
<b>Sent:</b> Tuesday, November 04, 2008 9:08 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Demand Controlled Ventilation<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>I would appreciate
anyone’s input on this as well. I have run 4 or 5 models recently
with DCV, and the results have almost always been either a wash, or INCREASED
energy for DCV. Most of them are PIU systems with either parallel or
series VAV boxes. Have used both return air sensors, zone sensors, as
well as both options for calculating the OA quantities. I think I’m
missing something as well…and I get the same results with increased space
cooling in the winter, as well as increased heating costs. I think it
must be how I’m defining the zone / system outside airflow rates, but I
can’t figure it out.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Arial","sans-serif";
color:teal'>GHT Limited<br>
</span></b><b><span style='font-family:"Arial","sans-serif"'><ns0:PersonName><span
style='color:black'>James Hansen</span></ns0:PersonName></span></b><b><span
style='font-size:12.0pt;font-family:"Times New Roman","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:12.0pt;
font-family:"Times New Roman","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
style='color:black'>1010 N. Glebe Rd, Suite 200</span></ns0:address></ns0:Street></span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:place><ns0:City><span
style='color:black'>Arlington</span></ns0:City><span style='color:black'>, </span><ns0:State><span
style='color:black'>VA</span></ns0:State><span style='color:black'> </span><ns0:PostalCode><span
style='color:black'>22201-4749</span></ns0:PostalCode></ns0:place></span><span
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color:black'>703-338-5754 (Cell)</span><span style='font-size:12.0pt;
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<p class=MsoNormal><span style='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>Colleen
Nelson<br>
<b>Sent:</b> Tuesday, November 04, 2008 10:12 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Demand Controlled Ventilation<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I have created a model with DCV as a parametric run and the
results are suspect. Comparing results for baseline and parametric run,
there is increased space cooling in the DCV model between November-March.
Also, ventilation fans are running much more during these same months than in
the summer. And, there are many hours where heating load is not being
met. Both models include economizer control limited by drybulb at 65 F.<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>I’ve attached .pd2 and .inp files.<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>I appreciate any help on this.<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>Colleen Nelson, LEED-AP<o:p></o:p></p>
<p class=MsoNormal>Mechanical Engineering<o:p></o:p></p>
<p class=MsoNormal>Michaud Cooley Erickson<o:p></o:p></p>
<p class=MsoNormal>612.673.6995<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
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