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<p>Karol,</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.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 08/16/2022 09:50, karol.bandurski---
via TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:001501d8b17f$82d17e40$88747ac0$@put.poznan.pl">
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<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US">Dear Experts.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></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.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We would like to keep
this control schedule and the same time avoid convergence
problem.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></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.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Do you have any other
ideas what we could do?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Should we change
something in Control Cards?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Karol <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:PL"
lang="EN-US">---------------------------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:PL"
lang="EN-US">Karol BANDURSKI Ph.D, Assistant Professor <o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span
style="mso-fareast-language:PL" lang="EN">Faculty of
Environmental and Energy Engineering </span><span
style="mso-fareast-language:PL" lang="EN"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:PL"
lang="EN-US">Division of Heating, Air Conditioning and Air
Protection <o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:PL"
lang="EN-US">Poznan University of Technology<o:p></o:p></span></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><span
style="mso-fareast-language:PL" lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL">***<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:PL">dr
inż. Karol BANDURSKI, Adiunkt</span><span
style="mso-fareast-language:PL"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL">Wydział
Inżynierii Środowiska i Energetyki<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:PL">Zakład
Ogrzewnictwa, Klimatyzacji i Ochrony Powietrza<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:PL"
lang="EN-US">Politechnika Poznańska</span><span
style="mso-fareast-language:PL" lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
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<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
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