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<p class="MsoNormal">Hi Javed,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">It’s a relatively common thing in modeling existing facilities / systems to encounter VFD’s installed as “expensive motor starters,” which do not actively vary the speed of the associated pump/fan motor. At times it can be observed the
motor is operating at a steady, unvarying speed (i.e. 50.2 Hz) on the VFD display, which may suggest the installation/commissioning agent used the VFD to “tune” the water or airflow to match something scheduled.<o:p></o:p></p>
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<p class="MsoNormal">Is this specifically what you’re trying to simulate?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If by contrast you mean to describe a constant volume system which has undergone a VAV conversion at the main supply fan, there is some nuance in system type selection over in doe2/eQuest world depending on exactly how that is controlled,
but ultimately many system types have the option of switching from constant speed fan motors to variable speed. I know you’re asking specifically about E+ but it’s my impression these platforms have more in common in terms of functionality than not – are
you able to take a template for a CV system and assign a curve to establish how the motor power input varies as the fan is made to operate at less than 100% of it’s rated airflow capacity? For visual reference, here are some of the options visualized from
our doe-2 curve library (visual specifically is sourced from the reference manual, Volume 2: Dictionary > HVAC Components > SYSTEM > Air Flow and Fans > Supply Fan > SUPPLY-KW/FLOW) :<o:p></o:p></p>
<p class="MsoNormal"><img width="452" height="387" style="width:4.7083in;height:4.0312in" id="Picture_x0020_2" src="cid:image003.png@01D3E84D.9364D0E0"><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#3A7A46">Nick Caton, P.E., BEMP</span></b><span style="color:#3A7A46"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Senior Energy Engineer</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Regional Energy Engineering Manager<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Energy and Sustainability Services</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Schneider Electric</span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">D </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">913.564.6361
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">M </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">785.410.3317
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">F </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">913.564.6380</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">E </span><span style="color:#1F497D"><a href="mailto:nicholas.caton@schneider-electric.com"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">nicholas.caton@schneider-electric.com</span></a><o:p></o:p></span></p>
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<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">15200 Santa Fe Trail Drive<br>
Suite 204<br>
Lenexa, KS 66219<br>
United States</span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Bldg-sim [mailto:bldg-sim-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Javed Iqbal via Bldg-sim<br>
<b>Sent:</b> Thursday, May 10, 2018 7:17 AM<br>
<b>To:</b> Bldg-sim <bldg-sim@lists.onebuilding.org><br>
<b>Subject:</b> [Bldg-sim] How to model CAV system with VFD in E+<o:p></o:p></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:9.5pt;font-family:"Arial",sans-serif;color:black">Dear All,<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:9.5pt;font-family:"Arial",sans-serif;color:black">I am trying to model CAV system which is serving a large volume of space and equipped with
<b>VFD control</b>. As far as I know, we can't model this setup directly in the E+. However there could be an alternative approach for this. W</span><span style="font-size:9.5pt;font-family:"Arial",sans-serif;color:#222222;background:white">hat do folks use
for such system in E+ models.</span><span style="font-size:9.5pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:9.5pt;font-family:"Arial",sans-serif;color:#222222"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:9.5pt;font-family:"Arial",sans-serif;color:#222222">Thanks for any <span class="gmail-m2410195414971062973gmail-m-5545357239250570474gmail-il">pointers</span>,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#073763">Javed Iqbal, LEED AP, CEA<br>
Sr. Energy Analyst</span><o:p></o:p></p>
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