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<p>Karol,</p>
<p> I would suggest sending the project and the files needed to run
it to your distributor. It may be that we need to dig inside the
code a bit to find out exactly what is not converging.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 08/17/2022 03:28, karol.bandurski---
via TRNSYS-users wrote:<br>
</div>
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<p class="MsoNormal"><span style="color:windowtext">Dear David
and Arian,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext" lang="EN-US">Thank
you for your quick response.<o:p></o:p></span></p>
<ol style="margin-top:0cm" type="1" start="1">
<li class="MsoListParagraph"
style="color:windowtext;margin-left:0cm;mso-list:l0 level1
lfo1"><span lang="EN-US">Unfortunately changing time step
doesn’t help (we change form 1h to 5 min).<o:p></o:p></span></li>
<li class="MsoListParagraph"
style="color:windowtext;margin-left:0cm;mso-list:l0 level1
lfo1"><span lang="EN-US">We also try switch off internal
calculation of convection coefficient on ceiling but it
not help, moreover it is not solution for us as we
simulate TABS. However we will switch off internal
calculation of convection coefficient for windows and
external walls.<o:p></o:p></span></li>
</ol>
<p class="MsoNormal"><span style="color:windowtext" lang="EN-US">Do
you have any other idea?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext" lang="EN-US">Do
you think that some settings in Control Cards could help
(change in numerical approach)?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext" lang="EN-US">Best,<br>
Karol<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext" lang="EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="color:windowtext;mso-fareast-language:PL">From:</span></b><span
style="color:windowtext;mso-fareast-language:PL"> David
BRADLEY <> <br>
<b>Sent:</b> Tuesday, August 16, 2022 8:38 PM<br>
<b>To:</b> TRNSYS users mailing list at OneBuilding.org
<a class="moz-txt-link-rfc2396E" href="mailto:trnsys-users@lists.onebuilding.org"><trnsys-users@lists.onebuilding.org></a><br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:karol.bandurski@put.poznan.pl">karol.bandurski@put.poznan.pl</a><br>
<b>Subject:</b> Re: [TRNSYS-users] convergence problems
because of high ventilation heat flux<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p>Karol,<span style="mso-fareast-language:PL"><o:p></o:p></span></p>
<p> Check your assumption about the way that the inside heat
transfer coefficients are being calculated on the zone
surfaces. If you have allowed the convection coefficients to
be internally calculated then you can end up with convergence
problems inside 56, particularly on inside window surfaces and
even more particularly if the glass has a high u-value.<o:p></o:p></p>
<p>kind regards,<o:p></o:p></p>
<p> David<o:p></o:p></p>
<p><o:p> </o:p></p>
<div>
<p class="MsoNormal">On 08/16/2022 09:50, karol.bandurski---
via TRNSYS-users wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="EN-US">Dear Experts.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">We get convergence
problem in Type 56. According to our investigation source
of error is sudden increase of ventilation flow in our
schedule and ventilation air temperature about 3 K lower
then room air temperature.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">We would like to keep
this control schedule and the same time avoid convergence
problem.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">So far we have
increase indoor air heat capacity in zones (five times),
it help a bit.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Do you have any other
ideas what we could do?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Should we change
something in Control Cards?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Best,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Karol </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:PL"
lang="EN-US">---------------------------------------------------------------------------</span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:PL"
lang="EN-US">Karol BANDURSKI Ph.D, Assistant Professor
</span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span
style="mso-fareast-language:PL" lang="EN">Faculty of
Environmental and Energy Engineering </span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:PL"
lang="EN-US">Division of Heating, Air Conditioning and Air
Protection </span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:PL"
lang="EN-US">Poznan University of Technology</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"><a
href="https://www.researchgate.net/profile/Karol_Bandurski"
moz-do-not-send="true"><span style="color:blue"
lang="EN-US">https://www.researchgate.net/profile/Karol_Bandurski</span></a></span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL">***</span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:PL">dr
inż. Karol BANDURSKI, Adiunkt</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL">Wydział
Inżynierii Środowiska i Energetyki</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:PL">Zakład
Ogrzewnictwa, Klimatyzacji i Ochrony Powietrza</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:PL"
lang="EN-US">Politechnika Poznańska</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"><br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>TRNSYS-users mailing list<o:p></o:p></pre>
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<pre><a href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org" moz-do-not-send="true" class="moz-txt-link-freetext">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a><o:p></o:p></pre>
</blockquote>
<pre>-- <o:p></o:p></pre>
<pre>***************************<o:p></o:p></pre>
<pre>David BRADLEY<o:p></o:p></pre>
<pre>Principal<o:p></o:p></pre>
<pre>Thermal Energy System Specialists, LLC<o:p></o:p></pre>
<pre>3 North Pinckney Street - suite 202<o:p></o:p></pre>
<pre>Madison, WI 53703 USA<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>P:+1.608.274.2577<o:p></o:p></pre>
<pre><a href="mailto:d.bradley@tess-inc.com" moz-do-not-send="true" class="moz-txt-link-freetext">d.bradley@tess-inc.com</a><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre><a href="http://www.tess-inc.com" moz-do-not-send="true" class="moz-txt-link-freetext">http://www.tess-inc.com</a><o:p></o:p></pre>
<pre><a href="http://www.trnsys.com" moz-do-not-send="true" class="moz-txt-link-freetext">http://www.trnsys.com</a><o:p></o:p></pre>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
TRNSYS-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:TRNSYS-users@lists.onebuilding.org">TRNSYS-users@lists.onebuilding.org</a>
<a class="moz-txt-link-freetext" href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a>
</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy System Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI 53703 USA
P:+1.608.274.2577
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.tess-inc.com">http://www.tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
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