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<p class="MsoNormal">Dear Karol,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">as always it is hard to tell without looking at the project.<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 assume your airnode air temperature is lower in winter than in summer.<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">Therefore, the surface temperature can be increase by radiative gains<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">For example if your ideal heating has defined a radiative part > 0
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">or you have higher internal radiative gains defined in winter compared to summer.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Another possibility is that you have defined a boundary surface with a higher boundary temperature.
<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">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>
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<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">-----------------------------------------------------------------------------------------------------------------------------------------------------------</span></b><span lang="DE-CH" style="mso-fareast-language:DE-CH">
</span><span 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>
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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 [mailto:trnsys-users-bounces@lists.onebuilding.org]
<b>Im Auftrag von </b>Karol Bandurski via TRNSYS-users<br>
<b>Gesendet:</b> Donnerstag, 26. April 2018 12:58<br>
<b>An:</b> TRNSYS-users@lists.onebuilding.org<br>
<b>Cc:</b> Karol Bandurski <karol.bandurski@put.poznan.pl><br>
<b>Betreff:</b> [TRNSYS-users] surface temperature increased by ACH<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 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">I have created model of house (Type 56). Heating is set as ideal with some limitation in power.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Then I compare indoor surface temperature between case with 1.5 ACH infiltration and without (0 ACH).<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">It is appear that indoor surface temperature are higher in the winter and lower in the summer if infiltration is 1.5ACH.How it is possible?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Convective heat transfer coefficient are set constant (11 kJ/hm2K for indoor surfaces).<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">Regards,<br>
Karol<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" style="mso-fareast-language:PL">--------------------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:PL">Karol BANDURSKI M. Sc.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:PL">Faculty of Civil and Environemntal Engeneering<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:PL">Division of Heating, Air Conditioning and Air Protection<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:PL">Poznan University of Technology<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><a href="https://www.researchgate.net/profile/Karol_Bandurski">https://www.researchgate.net/profile/Karol_Bandurski</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="PL" style="color:#1F497D;mso-fareast-language:PL"><a href="http://www.put.poznan.pl/~karol.bandurski"><span lang="EN-US">www.put.poznan.pl/~karol.bandurski</span></a></span><span lang="EN-US" style="color:#1F497D;mso-fareast-language:PL"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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