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<p class="MsoNormal">Howdy,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m trying to simulate a four pipe fan coil system with a DOAS ERV providing outdoor air in DOE 2.3 and getting some errors I haven’t been able to figure out, I’m hoping someone here knows the answer!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The fan coil system runs by itself, connected to a campus CHW and steam loop, though I get the following error in my sim file:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white">***ERROR***********************************************************************<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> Heat-Exchanger: L1West Perim Zn (G.W1) UA calculation<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> failed to converge.</span></b><b><span style="font-size:8.0pt;font-family:"Courier New";color:black"><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></b></p>
<p class="MsoNormal">This seems to be a random zone and switches every time I run it. Besides defining OA flow at the zone, there are no other custom inputs at this time on the zone. When I add the DOAS (without the ERV) to the “OA From” field in the fan coil
system, I get an aborted simulation and the following errors:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white">***NOTE************************************************************************<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> Convergence issues in Design-Day mode 14<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> Hours Slow: 3209; Hours Failed: 0<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white">***ERROR***********************************************************************<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> Heat-Exchanger: HENE Perim Zn (M.ENE16) UA calculation<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> failed to converge.<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white">***ERROR***********************************************************************<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> Heat-Exchanger: HSouth Perim Zn (Mb.S22) UA calculation<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> failed to converge.<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white">***ERROR***********************************************************************<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> Fatal HVAC simulation errors.</span></b><b><span style="font-size:8.0pt;font-family:"Courier New";color:black"><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></b></p>
<p class="MsoNormal">Adding the ERV to the DOAS gets me a new set of errors:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white">***NOTE************************************************************************<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> Convergence issues in Design-Day mode 14<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> Hours Slow: 3384; Hours Failed: 1834<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white">***ERROR***********************************************************************<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> Heat-Exchanger: HNorth Perim Zn (M.N17) UA calculation<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> failed to converge.<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white">**WARNING**********************************************************************<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> PredictX parabolic solution failed. Please<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> send this input and weather file to program developers 3015</span></b><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white">***ERROR***********************************************************************<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> Heat-Exchanger: HEast Perim Zn (T.E39) UA calculation<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> failed to converge.<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.25in;text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white">***ERROR***********************************************************************<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:white;mso-highlight:white"> Fatal HVAC simulation errors.</span></b><b><span style="font-size:8.0pt;font-family:"Courier New";color:black"><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></b></p>
<p class="MsoNormal">Same notes and warnings as before but it adds the PredictX warning around 50 times (I edited the above).
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I tried stepping back to DOE 2.2 but of course you can’t define a DOAS in that engine and in 2.2 and 2.3 I’m unable to put an ERV on a fan coil system type.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So then, can anyone shine a light on what’s going on?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black"><img width="125" height="54" style="width:1.302in;height:.5625in" id="_x0000_i1025" src="http://www.tbcxinc.com/TBCx_Logo_Email1000ppi.png" alt="TBCx"></span><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black"><br>
<br>
<b>Matt Garlick, CxA, CEM, BEMP</b><br>
Building Efficiency Engineer | TBCx<br>
<br>
E-mail: <a href="mailto:msg@tbcxinc.com">msg@tbcxinc.com</a><br>
Mobile: 801-907-5654<br>
Direct: 801-401-9492<br>
<br>
324 S. State Street, Suite 400<br>
Salt Lake City, UT 84111<br>
<a href="http://tbcxinc.com/"><span style="color:blue">www.tbcxinc.com</span></a></span><o:p></o:p></p>
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