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<p class="MsoNormal"><span style="color:#1F497D">Wirich,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Someone correct me if I’m wrong but I believe that with 3D geometry TRNSYS requires each individual surface to “see” each other surface in each zone and by splitting the wall in two you create two surfaces with
zero view factor between them. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Sam Currie<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Purdue University<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Freppel, Wirich [mailto:Wirich.Freppel@saint-gobain.com]
<br>
<b>Sent:</b> Thursday, May 16, 2013 5:32 AM<br>
<b>To:</b> trnsys-users@cae.wisc.edu<br>
<b>Subject:</b> [TRNSYS-users] TRNsys TYPE 22 Multi Surfaces Problem<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="FR">Dear TRNsys users,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR"><o:p> </o:p></span></p>
<p class="MsoNormal">When I set up a cubic room with Google sketch up and then import it into TRNSys 17 I can easily calculate the temperature of each surface (6). Also I can set up the temperature of one surface to a set point temperature and control it with
a “POWER” variable which is determined in TRNbuild.<o:p></o:p></p>
<p class="MsoNormal">So basically I heat one wall and calculate the temperature of the other wall plus the air temperature.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When I try to divide this wall into several, let’s say 2 walls (by using Google Sketch up to separate the walls) heating only one small wall (so half of the entire wall) becomes impossible. I get this error message :<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">Fatal Error at time : 1.000000</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> Generated by Unit : 56</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> Generated by Type : 56</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> Message : outside temperature of 2 (external) wall in zone 1 at time 1.00 not converged!</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Which I don’t understand. Is it possible to heat only a part of the wall?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">It definitely works with entire walls but not with separated wall.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks a lot in advance.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Wirich<o:p></o:p></p>
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