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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:EN-US">if I understood correctly your problem, maybe I can help you. With the modelling of an active layer, you can have a mass
flow rate of zero during the simulation because this is not a problem. The only limit is that the mass flow rate through the active layer during the simulation can not be lower than this minimum allowed mass flow rate. If you get an error about the mass flow
rate through this active layer, the only reason could be that the temperature of the room is controlled through a thermostat that allows the reduction of the mass flow rate to a value lower than the minimum allowed. This is not possible and that's why you
get an error.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:EN-US">So what I can suggest you is to use a simple On/Off controller that allows you to have or not to have a mass flow rate through
the active layer. You can control the temperature of the room through this controller. Be careful that the specified nominal mass flow rate through the active layer need to be higher than the minimum allowed.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:EN-US">As I told you, the problem is not if the mass flow is zero, but if 0 < mass flow < min. allowed. I hope everything is clear
now.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-top:4.0pt"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">Toni Calabrese</span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">, MSc.</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">Wissenschaftlicher Projektleiter<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"><a href="mailto:toni.calabrese@spf.ch"><span style="color:#0065A3">toni.calabrese@spf.ch</span></a> |</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#8C195F">
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"><a href="mailto:toni.calabrese@ost.ch"><span style="color:#0065A3">toni.calabrese@ost.ch</span></a></span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#8C195F"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#8C195F"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">T +41 58 257 4827<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#002060">SPF Institut für Solartechnik<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#002060">OST – Ostschweizer Fachhochschule<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#002060">Oberseestr. 10 | CH-8640 Rapperswil | Switzerland |
</span><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:red"><a href="http://www.spf.ch/"><span style="font-size:10.0pt;color:red;text-decoration:none">www.spf.ch</span></a></span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#002060">
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> TRNSYS-users <trnsys-users-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>Amirreza Heidari via TRNSYS-users<br>
<b>Sent:</b> Saturday, December 3, 2022 3:43 PM<br>
<b>To:</b> TRNSYS users mailing list at OneBuilding.org <trnsys-users@lists.onebuilding.org><br>
<b>Cc:</b> Amirreza Heidari <amirrezaheidarysbu@gmail.com><br>
<b>Subject:</b> [TRNSYS-users] issue with active layer<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Georgia",serif;color:black">Hello,</span><span style="font-family:"Georgia",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Georgia",serif;color:black">I am trying to model a multi-floor building with Ceiling heating. The temperature of each floor is controlled by a thermostat, that closes inlet valve when indoor temperature
reaches a specific level. But I have a problem to model this control, because as you see in the picture below there is a "</span><b><span style="font-size:13.5pt;font-family:"Georgia",serif;color:red">min. allowed inlet mass flowrate</span></b><span style="font-size:13.5pt;font-family:"Georgia",serif;color:black">"
. So if the valve closes the inlet water I receive an error that </span><span style="font-size:13.5pt;font-family:"Georgia",serif">flowrate<span style="color:black"> is below the level. </span></span><span style="font-family:"Georgia",serif"><o:p></o:p></span></p>
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<span style="font-size:18.0pt;font-family:"Georgia",serif;color:black">How can I design it in a way that the inlet
</span><span style="font-family:"Georgia",serif">flowrate</span><span style="font-size:18.0pt;font-family:"Georgia",serif;color:black"> can be zero sometimes?</span><span style="font-family:"Georgia",serif"><o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo1">
<span style="font-size:13.5pt;font-family:"Georgia",serif;color:black">Also my other question is about the surfaces section also shown in the picture below. I do not know why two CEILINGs appeared there, and I cannot delete them.</span><span style="font-family:"Georgia",serif"><o:p></o:p></span></li></ul>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Georgia",serif;color:black">Thank you</span><span style="font-family:"Georgia",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Georgia",serif;color:#0B5394"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Georgia",serif;color:#0B5394"><img border="0" width="517" height="297" style="width:5.3833in;height:3.0916in" id="_x0000_i1025" src="cid:image001.png@01D908C1.2A801E10" alt="image.png"><o:p></o:p></span></p>
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