<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
Santeri,<br>
This same issue frustrated me a long time ago as well. You have to
set the weather data reader to use the isotropic sky model. Type30
(and Type34, incidentally) both make some isotropic sky assumptions
internally so the radiation that comes in to them needs to make use
of the same diffuse model.<br>
Kind regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 9/25/2012 09:25, Santeri Siren
wrote:<br>
</div>
<blockquote
cite="mid:CAF-s-bLEav+ez1mPc5ONAR3tAs36XOBRaWYTzTXhtfSWLr0iVg@mail.gmail.com"
type="cite">Hello all,<br>
<br>
I am trying to use type 30a to model collector array shading on my
PV panel rows. I ran some test simulations and there seems to be a
mismatch between type 30a and weather data file in the total
radiation that reaches the surface. <br>
<br>
I set the following parameters to type 30 and to type 99 (weather
data):<br>
<br>
- slope of surface = 45<br>
- azimuth angle of surface = 0<br>
<br>
also in type 30:<br>
<br>
-slope of field = 0<br>
<br>
Then I set the row separation in type 30 to value 100 m. (there
should be no shading between PV arrays)<br>
<br>
When I log the total radiation on surface from type 30 and type 99
there is a mismatch. The radiation level of type 30 is always a
little lower than in the type 99. Does anyone know how this is
possible? have I possibly made wrong connections?<br>
<br>
Best regards. Santeri Siren
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
TRNSYS-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:TRNSYS-users@cae.wisc.edu">TRNSYS-users@cae.wisc.edu</a>
<a class="moz-txt-link-freetext" href="https://mailman.cae.wisc.edu/listinfo/trnsys-users">https://mailman.cae.wisc.edu/listinfo/trnsys-users</a>
</pre>
</blockquote>
<br>
<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>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
</body>
</html>