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<p class="MsoNormal">Hello All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am trying to model an enthalpy energy recovery wheel on a VAV air handler serving multiple zones, and I cannot seem to get any exhaust air to pass through the wheel. I have specified the design exhaust loads at the Zonal Level and I have
also setup the wheel control sequence using values that others on this forum have posted:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Operation = OA Exhaust DT<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>DT = 5 degree F<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Operating Mode = OA Heat/Cool<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Make up Air Temp Cntrl = Mixed Air Reset<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Capacity Control = Bypass OA<o:p></o:p></p>
<p class="MsoNormal">Whenever I run the model I get an error stating, “Energy Recovery ventilator: S1 Sys (VAVS) has an exhaust flow 50% of the supply flow. Performance may be compromised. OA & Exhaust: 7313. 0.” The total sum of all the Zonal Exhaust Loads
in 5505 CFM, and none of this is making it to the wheel. Does anyone have any insight as to what I might be doing wrong here? My end goal is to have the wheel modulate the return airflow in order to match the Outside Air CFM demand by the VAV system. Any input
is greatly appreciated. <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"><b><span style="font-size:12.0pt;color:#144C5C">Miles Martschink, Jr<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:#144C5C">Mechanical Design Engineer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;color:#144C5C">______________________________<br>
</span><span style="font-size:5.0pt;color:#144C5C"><br>
</span><b><span style="font-size:12.0pt;color:#144C5C">RMF Engineering<br>
</span></b><span style="font-size:10.5pt;color:#474D4F">Reliability. Efficiency. Integrity.<br>
</span><span style="font-size:5.0pt;color:#474D4F"><br>
</span><span style="font-size:10.5pt;color:#474D4F">p: 843.971.9639<br>
</span><b><span style="font-size:10.5pt;color:#BD974E"><a href="http://www.rmf.com/"><span style="color:#BD974E">www.rmf.com</span></a><br>
</span></b><a href="https://www.linkedin.com/company/rmf-engineering-inc.?trk=nav_account_sub_nav_company_admin"><span style="color:blue;text-decoration:none"><img border="0" width="39" height="39" id="Picture_x0020_3" src="cid:image005.png@01D15CE3.BC7830A0" alt="LinkedIn Icon"></span></a><a href="https://www.facebook.com/pages/RMF-Engineering/193267750706493?ref=hl"><span style="color:blue;text-decoration:none"><img border="0" width="39" height="39" id="Picture_x0020_4" src="cid:image006.png@01D15CE3.BC7830A0" alt="facebook icon"></span></a><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:10.5pt;color:#144C5C"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><o:p> </o:p></p>
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