<div dir="ltr"><div>Hi Jakob, thank you<span id="result_box" class="" lang="en"><span class=""> for the reply. </span></span><span tabindex="-1" id="result_box" class="" lang="en"><span class="">I think</span> <span class="">I will use the</span><span> solution 1. About this</span></span><span tabindex="-1" id="result_box" class="" lang="en"> <span>I would like</span> <span>to know why</span> <span>you talk</span> <span>only<u> inside HTC</u>. Also <u><span style="color:rgb(0,0,0)">outside HTC</span></u> has to be small?<br><br></span></span></div><span tabindex="-1" id="result_box" class="" lang="en"><span>Best regard<br>Chiara</span></span><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US"></span> </div><div class="gmail_extra"><br><div class="gmail_quote">2016-04-22 13:12 GMT+02:00 hotline <span dir="ltr"><<a href="mailto:hotline@transsolar.com" target="_blank">hotline@transsolar.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">Dear
</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Chiara,</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">A virtual surface isn’t the appropriate approach.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">Virtual surfaces should be used  as adjacent surfaces between zones in SketchUp which are merged into one zone with multiple airnodes.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">A virtual surface isn’t a heat transfer surface, it doesn’t exist in the thermal model. Thus, the error
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">message is correct. The volume of the canyon zone  isn’t closed and therefore no view factor matrix
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">could be calculated.  <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">Modelling outdoor space isn’t  a straightforward task.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">Solution 1<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">In order to generate a closed volume of the canyon and allow solar radiation to penetrate into the zone
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">you need a window. To do the shortwave solar correct you may use a so-called “no window” which has a transparency of 100 %.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">However, this surface has a temperature and thereby influences the zone air temperature by its inside convections<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">heat transfer coefficient (HTC) and the longwave exchange by its temperature.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">For reducing the influence on the air temperature you may define the  inside HTC to be small (like 0.01 kJ/k m²).<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">For longwave radiation exchange the window temperature should be approximately the sky temperature.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">However, you can’t fix a temperature of window. You have to try to calculate a surface gain such that the<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">Temperature is close and the model is still converging.
<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">Solution 2<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">You use solution 1 for calculating the incident radiation (total and direct) on the window and use this radiation<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">as input to a model which doesn’t contain a “canyon zone”.  For longwave radiation exchange you have to<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">estimate the “effective ground temperature”.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">All the best<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" lang="EN-US">The Transsolar Software Team<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">_________________________________________________________________________________________________<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"><u></u> <u></u></span></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Jakob Merk<u></u><u></u></span></i></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">TRNSYS Software Team<u></u><u></u></span></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black"><br>
</span></i><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Transsolar Energietechnik GmbH<u></u><u></u></span></b></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Curiestraße 2<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">70563 Stuttgart<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Web:      </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="http://www.trnsys.de/" target="_blank"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:blue">www.trnsys.de</span></a></span><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">
</span><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:#1f497d"><u></u><u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Von:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> TRNSYS-users [mailto:<a href="mailto:trnsys-users-bounces@lists.onebuilding.org" target="_blank">trnsys-users-bounces@lists.onebuilding.org</a>]
<b>Im Auftrag von </b>Chiara Colucci<br>
<b>Gesendet:</b> Mittwoch, 6. April 2016 16:49<br>
<b>An:</b> <a href="mailto:trnsys-users@lists.onebuilding.org" target="_blank">trnsys-users@lists.onebuilding.org</a><br>
<b>Betreff:</b> [TRNSYS-users] Trnsys17<u></u><u></u></span></p>
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