<html><head></head><body><div class="ydpb9bfde7yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div><div dir="ltr" data-setdir="false">Thanks Brian, glad to hear I'm not having hallucinations. I don't think the sizing matters because I input the actual airflow, static pressure, cooling capacity and heating capacity.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I seem to be making progress by changing some of the inputs.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Regards,<br></div><div><br></div><div class="ydpb9bfde7signature">Paul Diglio<br>87 Fairmont Avenue <br>New Haven, CT 06513 <br><br>203-415-0082</div></div>
<div><br></div><div><br></div>
</div><div id="ydpe0ca6c29yahoo_quoted_6291655789" class="ydpe0ca6c29yahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;">
<div>
On Tuesday, December 10, 2019, 11:34:06 AM EST, Brian Fountain <brian.fountain@sa-footprint.com> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id="ydpe0ca6c29yiv4289860950"><div>
<div class="ydpe0ca6c29yiv4289860950WordSection1">
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:11.0pt;">Paul,</span></p>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:11.0pt;">I have seen this error in 2.3 … and have had it crop up with small changes to the building/model as you describe. I am struggling to remember how we got past
it. </span></p>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:11.0pt;">I believe it has to do with the new sizing routine for air handling units. I was hoping Doug Maddox would jump into the conversation. (he has a video at maddoxenergy.com
on the sizing routine but it does not address this issue specifically)</span></p>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:11.0pt;">A couple of questions:</span></p>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydpe0ca6c29yiv4289860950MsoListParagraph"><span style="font-size:11.0pt;"><span>1)<span>
</span></span></span><span style="font-size:11.0pt;">Do you have heating and cooling design days set up? I would recommend this. (otherwise it runs the whole year for sizing).</span></p>
<p class="ydpe0ca6c29yiv4289860950MsoListParagraph"><span style="font-size:11.0pt;"><span>2)<span>
</span></span></span><span style="font-size:11.0pt;"> </span></p>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:11.0pt;">I will continue to try and remember which project(s) this came up on and how we resolved it. Sorry I am not more help but you aren’t alone (which also doesn’t
help).</span></p>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:11.0pt;">Brian</span></p>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal" style="margin-bottom:8.0pt;line-height:106%;"><b><span style="line-height:106%;">Footprint<br clear="none">
<br clear="none">
</span></b><b><span style="font-size:10.0pt;line-height:106%;">Brian Fountain<br clear="none">
</span></b><span style="font-size:9.0pt;line-height:106%;">Associate<br clear="none">
</span><span style="font-size:9.0pt;line-height:106%;">d
</span><span style="font-size:9.0pt;line-height:106%;">416 572 8501</span><span style="font-size:9.0pt;line-height:106%;"> m
</span><span style="font-size:9.0pt;line-height:106%;">416 562 6831</span></p>
</div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<div class="ydpe0ca6c29yiv4289860950yqt0126026993" id="ydpe0ca6c29yiv4289860950yqt47533"><div>
<div style="border-color: rgb(225, 225, 225) currentcolor currentcolor; border-style: solid none none; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><b><span style="font-size:11.0pt;">From:</span></b><span style="font-size:11.0pt;"> Equest-users <equest-users-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>Paul Diglio via Equest-users<br clear="none">
<b>Sent:</b> Tuesday, December 10, 2019 11:07 AM<br clear="none">
<b>To:</b> David Eldridge <DEldridge@grummanbutkus.com><br clear="none">
<b>Cc:</b> Sharad Kumar <sharadcapricious@gmail.com>; equest-users <equest-users@lists.onebuilding.org><br clear="none">
<b>Subject:</b> Re: [Equest-users] UA Convergence Error</span></p>
</div>
</div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"> </p>
<p class="ydpe0ca6c29yiv4289860950MsoNormal">CAUTION: EXTERNAL SENDER </p>
<div>
<div>
<div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span>Hi David:</span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span>No heat exchangers in the .inp file.</span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span>Thank you,</span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span>Paul Diglio<br clear="none">
87 Fairmont Avenue <br clear="none">
New Haven, CT 06513 <br clear="none">
<br clear="none">
203-415-0082</span></p>
</div>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span> </span></p>
</div>
</div>
<div id="ydpe0ca6c29yiv4289860950ydp958c632yahoo_quoted_6030908195">
<div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">On Tuesday, December 10, 2019, 10:46:12 AM EST, David Eldridge <<a shape="rect" href="mailto:deldridge@grummanbutkus.com" rel="nofollow" target="_blank">deldridge@grummanbutkus.com</a>> wrote:
</span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<div>
<div id="ydpe0ca6c29yiv4289860950ydp958c632yiv2153677201">
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal" style="margin-bottom:12.0pt;"><span style="font-size:10.0pt;">I didn’t think of this earlier, but search the *.inp to see if one is in there associated with the AHU that crashes, maybe some
relic code is in the file that isn’t shown in the UI.</span></p>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">DSE Mobile
</span></p>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">773.490.5038</span></p>
</div>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"><br clear="none">
<br clear="none">
</span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt;">
<p class="ydpe0ca6c29yiv4289860950MsoNormal" style="margin-bottom:12.0pt;"><span style="font-size:10.0pt;">On Dec 10, 2019, at 9:30 AM, Paul Diglio via Equest-users <<a shape="rect" href="mailto:equest-users@lists.onebuilding.org" rel="nofollow" target="_blank">equest-users@lists.onebuilding.org</a>>
wrote:</span></p>
</blockquote>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt;">
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"></span><span style="font-size:10.0pt;">
</span></p>
<div>
<div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span>Hi Sharad:</span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span>I can't find any heat exchangers in my model. How did you pull up the heat exchanger screen?</span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span>Thank you,</span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span>Paul Diglio<br clear="none">
87 Fairmont Avenue <br clear="none">
New Haven, CT 06513 </span></p>
</div>
</div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span> </span></p>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span> </span></p>
</div>
</div>
<div id="ydpe0ca6c29yiv4289860950ydp958c632yiv2153677201ydpbe1b492ayahoo_quoted_6580012121">
<div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">On Tuesday, December 10, 2019, 9:29:01 AM EST, Sharad Kumar via Equest-users <<a shape="rect" href="mailto:equest-users@lists.onebuilding.org" rel="nofollow" target="_blank">equest-users@lists.onebuilding.org</a>>
wrote: </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<div>
<div id="ydpe0ca6c29yiv4289860950ydp958c632yiv2153677201ydpbe1b492ayiv4550911065">
<div>
<div>
<div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">Hi Paul,</span><span style="font-size:10.0pt;"></span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">I think the problem is being caused due to some heat exchanger kind of thing being modeled in the built.</span><span style="font-size:10.0pt;"></span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">I am guessing out the problem as follows:</span><span style="font-size:10.0pt;"></span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">The UA calculations does not converge as there can be might possibility that then UA product and after multiplication with delta T does not converge with the
meeting of the capacity as the formula is Q= U* A* delta T.</span><span style="font-size:10.0pt;"></span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">Q= Capacity</span><span style="font-size:10.0pt;"></span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">UA= product of conductance and cross sectional area.</span><span style="font-size:10.0pt;"></span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">delta T= Temperature difference between ends.</span><span style="font-size:10.0pt;"></span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<div>
<div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"><image.png></span></p>
</div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">
</span><span style="font-size:10.0pt;"></span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">Hence try to succumb with the problem in lieu-wise as above.</span><span style="font-size:10.0pt;"></span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<div>
<div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"><image.png></span></p>
</div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">The other factors to have the UA product calculations to be right are as in above help page super-script which might can also guide as there are other factors
based calculations is there as if there the boxed figure are outrun.</span><span style="font-size:10.0pt;"></span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">Hope this might help.</span><span style="font-size:10.0pt;"></span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><b><span style="font-size:10.0pt;">Thanks and regards,</span></b><span style="font-size:10.0pt;"></span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">Sharad.Kumar</span><span style="font-size:10.0pt;"></span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">Freelancer-Energy Simulation and Day-lighting.</span><span style="font-size:10.0pt;"></span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><b><span style="font-size:10.0pt;">....................................................................................................................................................</span></b><span style="font-size:10.0pt;">.</span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">---------- Forwarded message ----------<br clear="none">
From: Paul Diglio <<a shape="rect" href="mailto:paul.diglio@sbcglobal.net" rel="nofollow" target="_blank">paul.diglio@sbcglobal.net</a>><br clear="none">
To: Equest-users <<a shape="rect" href="mailto:equest-users@lists.onebuilding.org" rel="nofollow" target="_blank">equest-users@lists.onebuilding.org</a>><br clear="none">
Cc: <br clear="none">
Bcc: <br clear="none">
Date: Mon, 9 Dec 2019 11:13:13 +0000 (UTC)<br clear="none">
Subject: [Equest-users] UA Convergence Error</span></p>
<div>
<div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span>Hi Folks:</span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span>I am getting a "heat exchanger XX Sys1 UA calculation failed to converge" error. The model has three building in it and only two air handlers per building. I don't have any
heat exchangers attached to the air handlers or any heat recovery installed.</span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span>Sometimes the error occurs when I change the glass type via the library and other times I get the error when I adjust the air changes per hour in one or two zones.</span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span>In the example above, the error was for system B2, but it varies...sometimes systems A or C 1 or 2.</span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span>Any ideas what the problem could be? </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span>Thank you,</span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span> </span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal" style="margin-bottom:12.0pt;"><span>Paul Diglio<br clear="none">
87 Fairmont Avenue <br clear="none">
New Haven, CT 06513 <br clear="none">
<br clear="none">
</span></p>
</div>
</div>
</div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">_______________________________________________<br clear="none">
Equest-users mailing list<br clear="none">
<a shape="rect" href="mailto:Equest-users@lists.onebuilding.org" rel="nofollow" target="_blank">Equest-users@lists.onebuilding.org</a><br clear="none">
<a shape="rect" href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" rel="nofollow" target="_blank">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a></span></p>
</div>
</div>
</div>
</div>
</div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">_______________________________________________<br clear="none">
Equest-users mailing list<br clear="none">
<a shape="rect" href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" rel="nofollow" target="_blank">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br clear="none">
To unsubscribe from this mailing list send a blank message to <a shape="rect" href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG" rel="nofollow" target="_blank">
EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a></span></p>
</div>
</div>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"><image.png></span></p>
</div>
<div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"><image.png></span></p>
</div>
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;">_______________________________________________
</span></p>
<div id="ydpe0ca6c29yiv4289860950ydp958c632yiv2153677201yqtfd91580">
<p class="ydpe0ca6c29yiv4289860950MsoNormal"><span style="font-size:10.0pt;"><br clear="none">
Equest-users mailing list<br clear="none">
<a shape="rect" href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" rel="nofollow" target="_blank">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br clear="none">
To unsubscribe from this mailing list send a blank message to <a shape="rect" href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG" rel="nofollow" target="_blank">
EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a></span></p>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</div>
</div></div>
</div>
</div></div></div>
</div>
</div></body></html>