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<p class="MsoNormal"><span lang="EN-US">Dear Marco,<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">unfortunately, the solar absorption as well as the long wave
</span><span lang="EN-US">emissivity</span><span lang="EN-US"> coefficients of opaque surfaces can’t be changed during the simulation currently.<br>
<br>
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">If you want to vary the coefficients on the outside face of an external wall, you may use the following “workarounds”:<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN-US">Instead of modifying the solar absorptance you can modify the absorbed solar radiation by varying the external shading factor for a wall.<br>
(Note: the external shading factor influences the incident solar radiation not the longwave radiation exchange)</span><span lang="EN-US" style="font-size:10.0pt"><o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN-US">Instead of modifying the outside emissivity of an external wall you set the outside emissivity to 0 and calculate the energy gain/loss to longwave radiation exchange
with the environment “manually” by equations and link the value as “surface gain outside” to the surface.<br>
The equations for the longwave radiation exchange outside are given in 05-MultizoneBuilding.pdf Eq. 5.4.1-13 and
</span><span lang="EN-US" style="font-size:10.0pt">Eq. 5.4.1-14 </span><span lang="EN-US"><o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The draw back of the “workaround” is that you have to do this for each surface. Doing this by a “construction type” is of course much more comfortable.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Well, it doesn’t seems hard to implement this as a “new feature”. Are you interested in varying the values on the inside face of the outside face of a wall?<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 regards,<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"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#A6A6A6;mso-fareast-language:DE">Transsolar Software Team<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#4472C4;mso-fareast-language:DE">hotline@transsolar.com</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#A6A6A6;mso-fareast-language:DE"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#A6A6A6;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#A6A6A6;mso-fareast-language:DE">Transsolar
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#A6A6A6;mso-fareast-language:DE">Stuttgart | Munich | Paris | New York<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#A6A6A6;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#A6A6A6;mso-fareast-language:DE">Transsolar Energietechnik GmbH | Curiestrasse 2 | 70563 Stuttgart | Germany<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#A6A6A6;mso-fareast-language:DE">CEO: Matthias Schuler, Thomas Auer, Stefan Holst, Dieter Schnelle
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#A6A6A6;mso-fareast-language:DE">Registered at Amtsgericht Stuttgart HRB 23347 | USt-IdNr.: DE 152272639<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"><o:p> </o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="mso-fareast-language:DE">Von:</span></b><span style="mso-fareast-language:DE"> TRNSYS-users <trnsys-users-bounces@lists.onebuilding.org>
<b>Im Auftrag von </b>Marco Noro via TRNSYS-users<br>
<b>Gesendet:</b> Dienstag, 26. Juli 2022 14:14<br>
<b>An:</b> trnsys-users@lists.onebuilding.org<br>
<b>Cc:</b> Marco Noro <marco.noro@unipd.it><br>
<b>Betreff:</b> [TRNSYS-users] Variable solar absorption coefficient and long waive emissivity in TRNSYS<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Dear TRNSYS-users mailing list,<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">I would like to kindly ask you how is possible to implement the variable absorption characteristic of walls in TRNSYS. When using TRNSYS and TRBUILD, fixed solar absorption and long waive emissivity are allowed to be
set when defining a wall layer. How do you managed the necessity to give variable (with the surface temperature) values of such parameters?<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">Thank you in advance for your cooperation.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="IT">Best regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="IT"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="IT">Marco Noro<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="IT" style="font-family:"Garamond",serif;color:#2F5496;mso-fareast-language:IT"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="IT" style="font-family:"Garamond",serif;color:#2F5496;mso-fareast-language:IT">***************************************************<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="IT" style="font-family:"Garamond",serif;color:#2F5496;mso-fareast-language:IT">Marco Noro, PhD<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Garamond",serif;color:#2F5496;mso-fareast-language:IT">Associate Professor</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Garamond",serif;color:#2F5496;mso-fareast-language:IT"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Garamond",serif;color:#2F5496;mso-fareast-language:IT"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Garamond",serif;color:#2F5496;mso-fareast-language:IT">Department of Management and Engineering - University of Padova<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="IT" style="font-size:10.0pt;font-family:"Garamond",serif;color:#2F5496;mso-fareast-language:IT">Stradella San Nicola, 3 - 36100 Vicenza (VI) - Italy<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Garamond",serif;color:#2F5496;mso-fareast-language:IT">Ph. +390444 998704<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Garamond",serif;color:#2F5496;mso-fareast-language:IT">Email
</span><span lang="IT" style="font-size:10.0pt;font-family:"Garamond",serif;color:#2F5496;mso-fareast-language:IT"><a href="mailto:marco.noro@unipd.it"><span lang="EN-US" style="color:#2F5496">marco.noro@unipd.it</span></a></span><span lang="EN-US" style="font-size:10.0pt;font-family:"Garamond",serif;color:#2F5496;mso-fareast-language:IT"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="IT" style="font-size:10.0pt;font-family:"Garamond",serif;color:#2F5496;mso-fareast-language:IT">PEC
<a href="mailto:marco.noro@pec.it"><span style="color:#2F5496">marco.noro@pec.it</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="IT" style="font-size:10.0pt;font-family:"Garamond",serif;color:#2F5496;mso-fareast-language:IT">Skype nereo3<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="IT" style="font-size:10.0pt;font-family:"Garamond",serif;color:#2F5496;mso-fareast-language:IT">Web
</span><span lang="IT" style="font-size:10.0pt;font-family:"Garamond",serif;mso-fareast-language:IT"><a href="https://sites.google.com/site/marconoro03">Marco Noro (google.com)</a><span style="color:#2F5496"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="IT" style="mso-fareast-language:IT"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="IT"><o:p> </o:p></span></p>
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