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<p class="MsoNormal"><span lang="EN-US">Dear TRNSYS-Users,<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">In this news group a question concerning modelling differences of Type 56 between the following option of an opaque surface was posted:<o:p></o:p></span></p>
<ol style="margin-top:0cm" start="1" type="a">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level1 lfo1"><span lang="EN-US">BOUNDARY=INTERNAL<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level1 lfo1"><span lang="EN-US">BOUNDARY=IDENTICAL<o:p></o:p></span></li></ol>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Both options yield to the exact same results
<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo2"><span lang="EN-US">if the surface construction type is defined symmetrically
<br>
(symmetric layer composition, solar absorption front = solar absorption back, IR emissivity front = IR emissivity back, heat transfer coefficient front = heat transfer coefficient solar absorption back)<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo2"><span lang="EN-US">if the a) is defined a single surface with double area and b) is defines as two surfaces with half the area:<o:p></o:p></span></li></ul>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:18.0pt"><span lang="EN-US"> WALL =REFEND_TERRE_CRUE : SURF= 3 : AREA= 2 : INTERNAL<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:18.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:53.4pt;text-indent:17.4pt"><span lang="EN-US">WALL =REFEND_TERRE_CRUE : SURF= 5 : AREA= 1 : BOUNDARY=IDENTICAL<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-indent:34.8pt"><span lang="EN-US">WALL =REFEND_TERRE_CRUE : SURF= 6 : AREA= 1 : BOUNDARY=IDENTICAL<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">The reason for this is that Type56 splits the INTERNAL surface (a) into 2 equivalent surfaces with half the area.<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 <b>recommend </b>to use the<b> option “BOUNDARY=IDENTICAL”</b> because
<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo2"><span lang="EN-US">the users enters directly what is modelled (no hidden rearrangement)<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo2"><span lang="EN-US">it can be used for 3D geometry<o:p></o:p></span></li></ul>
<p class="MsoNormal" style="margin-left:18.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The option “BOUNDARY=IDENTICAL” is kept up to now for “historical reasons”.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">It is under consideration to drop this option.<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">Marion<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#005A00;mso-fareast-language:DE-CH">-----------------------------------------------------------------------------------------------------------------------------------------------------------</span></b><span lang="EN-US" style="mso-fareast-language:DE-CH">
<o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="DE-CH" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#005A00;mso-fareast-language:DE-CH">Dipl.-Ing. Marion Hiller </span></b><b><span lang="DE-CH" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#009900;mso-fareast-language:DE-CH"><br>
</span></b><b><span lang="DE-CH" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#007000;mso-fareast-language:DE-CH">TRANSSOLAR Energietechnik GmbH </span></b><span lang="DE-CH" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:blue;mso-fareast-language:DE-CH"><br>
</span><b><span lang="DE-CH" style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#005A00;mso-fareast-language:DE-CH">Stuttgart - Munich - New York - Paris
</span></b><b><span lang="DE-CH" style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#007000;mso-fareast-language:DE-CH"> <o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span lang="DE-CH" style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#007000;mso-fareast-language:DE-CH">t:
<a href="tel:%2B49.711.67976.27" target="_blank"><span style="color:#007000">+49.711.67976.0</span></a> f:
<a href="tel:%2B49.711.67976.11" target="_blank"><span style="color:#007000">+49.711.67976.11</span></a></span></b><span style="font-size:13.5pt;font-family:"Helvetica",sans-serif;color:#007000;mso-fareast-language:DE-CH"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="DE-CH" style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#0070C0;mso-fareast-language:DE-CH"><a href="http://www.transsolar.com/" target="_blank"><span style="color:#0070C0">www.transsolar.com/</span></a></span></b><b><span lang="DE-CH" style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#005A00;mso-fareast-language:DE-CH"> <br>
<br>
</span></b><b><span lang="DE-CH" style="font-size:7.5pt;font-family:"Arial",sans-serif;mso-fareast-language:DE-CH">KlimaEngineering - Technologien für energieeffizientes Bauen und Nutzerkomfort in Gebäuden <span style="color:#005A00"><br>
</span>Transsolar Energietechnik GmbH, Curiestrasse 2, 70563 Stuttgart <o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span lang="DE-CH" style="font-size:7.5pt;font-family:"Arial",sans-serif;mso-fareast-language:DE-CH">Amtsgericht Stuttgart - HRB 23347</span></b><b><span style="font-size:7.5pt;font-family:"Arial",sans-serif;mso-fareast-language:DE-CH">
/ Steuernummer: 99073/00911 / USt-IdNr.: DE 152272639</span></b><b><span lang="DE-CH" style="font-size:7.5pt;font-family:"Arial",sans-serif;mso-fareast-language:DE-CH"><br>
Geschäftsführer: Matthias Schuler, Thomas Auer, Stefan Holst, Dieter Schnelle </span></b><span style="font-size:13.5pt;font-family:"Helvetica",sans-serif;mso-fareast-language:DE-CH"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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