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Cédric,<br>
You are correct; Type30 does assume an isotropic sky. We do not
have any plans to change that. The isotropic model assumes that the
sky is the same brightness no matter where you look. The Perez model
augments the diffuse radiation near the horizon and in the vicinity
of the sun so the isotropic model is a bit more conservative as far
as unshaded diffuse radiation is concerned. However, as you notices,
if you separate the rows by a very big distance in Type30 and feed
it Perez unshaded radiation, you'll notice that all but the 1st row
still show a little bit of shading. I would recommend that you run
the simulation both ways (isotropic sky model with Type30 and Perez
with Type30) and look at the annual difference in end result
(auxiliary energy use perhaps) to judge whether the assumption is an
important one or not.<br>
Kind regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 3/31/2014 10:40, PAULUS Cedric
217865 wrote:<br>
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<p class="MsoNormal">Dear TRNSYS-Users,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I would like to use the
type of collector array shading between rows (type 30)
connected to a weather data reading and processing (type 15)
in order to simulate performance of large scale solar
collector field.<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 made some first check
only with one row in order to find normally the same results
as without collector shading. The beam radiation is the same
(normal) but the total radiation is lower due to a lower
diffuse radiation (not normal). When I check the type 30
model it seems that an isotropic sky model has been
implemented in order to calculate the diffuse radiation. Am
I right ?<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">As I prefer to use the
Perez 1999 Model (5 for the parameter “Tilted Surface
Radiation Mode” of type 15), I would like to know if this
model was or is planned to be implemented in the type 30 ?<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">Thanks<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"><b><span
style="color:gray;mso-fareast-language:FR">Cédric Paulus</span></b><b><span
style="color:gray;mso-fareast-language:FR"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;color:gray;mso-fareast-language:FR"
lang="EN-US">CEA INES – DTBH/SBRT/LSHT | +33 (0)4 79 79 21
17<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.tess-inc.com">http://www.tess-inc.com</a>
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