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<p class="MsoNormal"><span style="color:#1F497D">Dear Marcello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">I just had a look into your model. There are actually two main reasons causing the deviation between your<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">manual calculation and the TRNSYS Simulation.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:38.7pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span lang="EN-US" style="color:#1F497D"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:#1F497D">You haven’t set geosurf (beam radiation distribution factor) values, the shortwave radiation is then distributed area weighted<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:38.7pt"><span lang="EN-US" style="color:#1F497D">to the surfaces, and consequently also to the windows. Therefore a part of the solar radiation leave
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:38.7pt"><span lang="EN-US" style="color:#1F497D">the zone depending on the transmissivity of the window.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:38.7pt"><span lang="EN-US" style="color:#1F497D">So if you set the geosurf value of the floor to one, all the short wave radiation will hit the floor.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:38.7pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span lang="EN-US" style="color:#1F497D"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:#1F497D">If you do so, there is still a large deviation because of the imperfect absorption of the radiation on
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:38.7pt"><span lang="EN-US" style="color:#1F497D">the floor. To solve this, set the absorption coefficients of the floor to 1 and apply a good insulation.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:38.7pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span lang="EN-US" style="color:#1F497D"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:#1F497D">There will be still a deviation of around 10 % caused by heat losses through the windows and walls.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Best<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:38.7pt"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><i><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">_________________________________________________________________________________________</span></i><i><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">_________<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Jochen Lam<o:p></o:p></span></i></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">TRNSYS Software Team<o:p></o:p></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<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Curiestraße 2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">70563 Stuttgart<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Fax: +49 711 67976-11<br>
Email: <a href="mailto:jlam@transsolar.com">jlam@transsolar.com</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Web: <a href="http://www.trnsys.de/">www.trnsys.de</a>
</span><span style="color:#1F497D"><o:p></o:p></span></p>
</div>
<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"">Von:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> TRNSYS-users [mailto:trnsys-users-bounces@lists.onebuilding.org]
<b>Im Auftrag von </b>marcello.caciolo@cofelyaxima-gdfsuez.com<br>
<b>Gesendet:</b> Mittwoch, 16. Juli 2014 15:06<br>
<b>An:</b> trnsys-users@cae.wisc.edu<br>
<b>Betreff:</b> [TRNSYS-users] TR: Cooling and solar heat gains<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<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" style="color:#1F497D">I post again this message, hoping that someone can give a quick look to our sample project and give us some ideas on the reasons we don’t have the results we expected :
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We have a little problem with type 56. I send you enclosed a sample project illustrating our problem.<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 type 56, we have one zone with 4 external glazed surfaces, with 4 orientations (namely ENE,
<span style="color:#9BBB59">124 m2</span>, SSE, <span style="color:#C0504D">48m2</span>, OSO,
<span style="color:#4BACC6">124 m2</span> and Horizontal, <span style="color:#8064A2">
198 m2</span>), and a boundary surface, with identical 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">There are no internal loads. External radiation is fixed to
<span style="color:#9BBB59">1000 kJ/hm2</span> on ENE, <span style="color:#C0504D">
2000 kJ/hm2</span> on SSE, <span style="color:#4BACC6">600 kJ/hm2</span> on OSO and
<span style="color:#8064A2">800 kJ/hm2</span> on horizontal, and assumed totally direct (ITotal = IBeam), with a zero incident angle for each orientation (this is no realistic, but we wanted to avoid problems with angle-dependant transmission coefficient).<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">A cooling type is added to the building, in order to maintain ambient temperature to 26°C.<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">All the windows have a <b>SHGC</b> of <b>
0.387</b>, for 0° incident radiation, calculated by LBNL Window, and a ratio of frame of 10 %.<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 expected cooling load, for static conditions, to be in the order of the result of following equation :<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:8.5pt;font-family:"MS Sans Serif"">(<span style="color:#1F497D">
</span><span style="color:#9BBB59">IT_ENE*124</span><span style="color:#1F497D"> </span>
+<span style="color:#1F497D"> </span><span style="color:#C0504D">IT_SSE*48</span><span style="color:#1F497D">
</span>+<span style="color:#1F497D"> </span><span style="color:#4BACC6">IT_OSO*124</span><span style="color:#1F497D">
</span>+<span style="color:#1F497D"> </span><span style="color:#8064A2">RadTotHor*198</span><span style="color:#1F497D"> </span>)*<span style="color:#1F497D">
</span><b>0.387<span style="color:#1F497D"> </span></b>*<span style="color:#1F497D">
</span>0.9<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:8.5pt;font-family:"MS Sans Serif";color:blue">! 124 = WinSurf ENE, 48 = WinSurf SSE, 124 = WinSurf OSO, 198 = WinSurf Hor<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="FR" style="font-size:8.5pt;font-family:"MS Sans Serif";color:blue">! 0.387 = Win SHGC<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR" style="font-size:8.5pt;font-family:"MS Sans Serif";color:blue">! 0.9 = 1-ratioFrame</span><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">(TotalRad equation)<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">However, TRNSYS give us almost half of this load (P froid in this picture, VS AppSolaires calculated by TotalRad equation).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="FR"><img border="0" width="798" height="409" id="_x0000_i1025" src="cid:image002.jpg@01CFA10A.D7CA54A0"><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">Do you have any idea of the reason our hand calculation is so far from TRNSYS calculation?<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 for your help !<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" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="FR" style="font-family:"Tahoma","sans-serif";color:#58595B">Marcello Caciolo</span></b><span lang="FR" style="font-family:"Tahoma","sans-serif";color:#58595B"><br>
</span><span lang="FR" style="font-size:9.0pt;font-family:"Tahoma","sans-serif";color:#58595B">Responsable Outils et Méthodes d'Analyse Energétique</span><span lang="FR" style="font-family:"Tahoma","sans-serif";color:#58595B"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:gray"><img border="0" width="170" height="62" id="Image_x0020_1" src="cid:image003.jpg@01CFA10A.D7CA54A0" alt="cid:image003.jpg@01CD4E08.954D04D0"><br>
<b><br>
</b>Cellule Efficacité Energétique et Environnementale - Pôle Projets et Réalisations<br>
46 Boulevard de la Prairie au Duc<br>
BP 40119 - 44201 Nantes Cedex 02</span><span lang="FR" style="font-size:9.0pt;font-family:"Tahoma","sans-serif""><br>
</span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:gray">Tél.: +33 02 40 41 06 57</span><span lang="FR" style="font-size:9.0pt;font-family:"Tahoma","sans-serif""><br>
<a href="mailto:prenom.nom@aximaseitha-gdfsuez.com">marcello.caciolo@cofelyaxima-gdfsuez.com</a></span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:gray"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR" style="font-family:Webdings;color:#339966">P</span><span lang="FR" style="font-size:10.0pt;font-family:Webdings;color:#339966">
</span><b><span lang="FR" style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#339966">Pensez à l'environnement avant d'imprimer ce message</span></b><span lang="FR"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR"><o:p> </o:p></span></p>
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