<div dir="ltr">Ok, I need to do some study on the standards then. Thanks!<div><br></div><div><br></div><div>Javier</div></div><div class="gmail_extra"><br><div class="gmail_quote">2018-01-05 21:15 GMT-03:00 <span dir="ltr"><<a href="mailto:trnsys-users-request@lists.onebuilding.org" target="_blank">trnsys-users-request@lists.onebuilding.org</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send TRNSYS-users mailing list submissions to<br>
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<br>Today's Topics:<br>
<br>
1. Radiant barrier (Ilyas Ismaili)<br>
2. Doubt on the codes of some TESS Unglazed collector models<br>
(Javier Vega)<br>
3. Re: Doubt on the codes of some TESS Unglazed collector models<br>
(Jeff Thornton)<br>
4. trnsys-greenhouse (azeddine fantasse)<br>
<br><br>---------- Mensaje reenviado ----------<br>From: Ilyas Ismaili <<a href="mailto:karaktus@gmail.com">karaktus@gmail.com</a>><br>To: "TRNSYS users mailing list at OneBuilding.org" <<a href="mailto:trnsys-users@lists.onebuilding.org">trnsys-users@lists.onebuilding.org</a>>, <a href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a><br>Cc: <br>Bcc: <br>Date: Fri, 5 Jan 2018 20:25:50 +0000<br>Subject: [TRNSYS-users] Radiant barrier<br><div dir="ltr"><img class="m_1801303477068276981mailtrack-img" alt="" style="display:flex" width="0" height="0"><div><div><div><div>Dear TRNSYS users,<br></div>I'm trying to model a radiant barrier in the roof of a building, so I put a 10cm airgap into the external roof layers, and I set the back absorptance of the roof to 0.05 (since radiant barrier can achieve up to 95% heat reduction, correct me if this value is wrong).<br></div>Is this modelling correct, or there is another way to do it?</div><div>Regards,<br></div></div><div><div><div><div><div><div><br><br><br></div></div></div></div></div></div></div>
<br><br>---------- Mensaje reenviado ----------<br>From: Javier Vega <<a href="mailto:jvega025@gmail.com">jvega025@gmail.com</a>><br>To: <a href="mailto:trnsys-users@lists.onebuilding.org">trnsys-users@lists.onebuilding.org</a><br>Cc: <br>Bcc: <br>Date: Fri, 5 Jan 2018 17:45:34 -0300<br>Subject: [TRNSYS-users] Doubt on the codes of some TESS Unglazed collector models<br><div dir="ltr">Hi TRNSYS users,<div><br></div><div>I was just checking the codes of Type 553 and Type 1290 (Unglazed Solar Collector models) and something grabbed my attention. When both models do the Net Long Wave Radiation Balance, they do the following:</div><div><br></div><div><div>!Account for the long wave losses from the collector surface</div><div> T_ambient_K = T_ambient+273.15</div><div> T_sky_K = T_sky+273.15</div><div> Sigma = 3.6*5.67d-08 !Stefan Boltmann constant</div><div> Net_Longwave = Sigma*(T_ambient_K**4.-T_sky_<wbr>K**4.)*Emissivity/Absorptance</div></div><div><br></div><div>That is a copy/paste of Type 553.</div><div><br></div><div><br></div><div><br></div><div>Why the Net Long Wave is defined with the Ambient Temperature and not with the Collector Average Temperature? It doesn't make sense to me. Is there something I'm uderstanding wrong?</div><div><br></div><div>Bests of wishes,</div><div><br></div><div>Javier Vega Benavente</div><div>Universidad de Concepción, Chile.</div></div><div id="m_-4738393645574274463DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br> <table style="border-top:1px solid #d3d4de">
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<br><br>---------- Mensaje reenviado ----------<br>From: Jeff Thornton <<a href="mailto:thornton@tess-inc.com">thornton@tess-inc.com</a>><br>To: "TRNSYS users mailing list at OneBuilding.org" <<a href="mailto:trnsys-users@lists.onebuilding.org">trnsys-users@lists.onebuilding.org</a>><br>Cc: <br>Bcc: <br>Date: Fri, 05 Jan 2018 15:08:17 -0600<br>Subject: Re: [TRNSYS-users] Doubt on the codes of some TESS Unglazed collector models<br><u></u>
<div>
<p>Javier,</p>
<p>It's the net long wave radiation on the collector surface - not the long wave radiation from the collector surface to the sky. It's taken directly from the standards for modeling un-glazed solar collectors.</p>
<p> </p>
<p>Jeff</p>
<p> </p>
<div>
<pre>---<br>Jeff Thornton
President - TESS LLC
22 N. Carroll Street, Madison WI USA 53703
Office: <a href="tel:(608)%20274-2577" value="+16082742577" target="_blank">(608) 274-2577</a> Fax: <a href="tel:(608)%20278-1475" value="+16082781475" target="_blank">(608) 278-1475</a>
<a href="http://www.tess-inc.com" target="_blank">www.tess-inc.com</a>
E-Mail: <a href="mailto:thornton@tess-inc.com" target="_blank">thornton@tess-inc.com</a>
</pre>
</div>
<p>On 01/05/2018 2:45 pm, Javier Vega via TRNSYS-users wrote:</p>
<blockquote type="cite" style="padding-left:5px;border-left:#1010ff 2px solid;margin-left:5px">
<div dir="ltr">Hi TRNSYS users,
<div> </div>
<div>I was just checking the codes of Type 553 and Type 1290 (Unglazed Solar Collector models) and something grabbed my attention. When both models do the Net Long Wave Radiation Balance, they do the following:</div>
<div> </div>
<div>
<div>!Account for the long wave losses from the collector surface</div>
<div> T_ambient_K = T_ambient+273.15</div>
<div> T_sky_K = T_sky+273.15</div>
<div> Sigma = 3.6*5.67d-08 !Stefan Boltmann constant</div>
<div> Net_Longwave = Sigma*(T_ambient_K**4.-T_sky_<wbr>K**4.)*Emissivity/Absorptance</div>
</div>
<div> </div>
<div>That is a copy/paste of Type 553.</div>
<div> </div>
<div> </div>
<div> </div>
<div>Why the Net Long Wave is defined with the Ambient Temperature and not with the Collector Average Temperature? It doesn't make sense to me. Is there something I'm uderstanding wrong?</div>
<div> </div>
<div>Bests of wishes,</div>
<div> </div>
<div>Javier Vega Benavente</div>
<div>Universidad de Concepción, Chile.</div>
</div>
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<br><br>---------- Mensaje reenviado ----------<br>From: azeddine fantasse <<a href="mailto:azeddinefantasse@gmail.com">azeddinefantasse@gmail.com</a>><br>To: <a href="mailto:trnsys-users@lists.onebuilding.org">trnsys-users@lists.onebuilding.org</a>, <a href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>, <a href="mailto:thornton@tess-inc.com">thornton@tess-inc.com</a><br>Cc: <br>Bcc: <br>Date: Fri, 5 Jan 2018 21:26:17 +0000<br>Subject: [TRNSYS-users] trnsys-greenhouse<br><div dir="ltr"><span style="font-size:12.8px">hello Ms bradley i want to ask you if i can find a type of greenhouse in trnsys?</span><div style="font-size:12.8px">if not i would like the mean for this.</div><div style="font-size:12.8px">thanxs</div><div><div class="m_8098842512102788536gmail_signature"><div dir="ltr"><div><div dir="ltr"><div style="font-size:12.8px;color:rgb(136,136,136)">Cordialement<div style="margin:2px 0px 0px"><div><img></div></div><span><br>Azeddine FANTASSE <br></span></div><span style="font-size:12.8px"><font color="#888888"><div style="font-size:12.8px">Doctorant en Sciences Physique et Ingenieurie</div><div style="font-size:12.8px">Faculté des Sciences Samlalia</div><div style="font-size:12.8px">Université Cadi Ayyad , Marrakech</div><div style="font-size:12.8px">Mail : <font color="#3366ff"><u><a href="mailto:azeddinefantasse@gmail.com" style="color:rgb(17,85,204)" target="_blank">azeddinefantasse@gmail.com</a></u></font></div><div style="font-size:12.8px">Tel : 06 35 74 41 33</div></font></span></div></div></div></div></div>
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