<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
Dev,<br>
The thermal losses from a collector are computed based on a
temperature difference between the fluid and the ambient. There are
a number of different standards, however. Some base these losses on
the difference between the inlet fluid temperature and the ambient
while others use a mean fluid temperature. In order to get a more
accurate estimate of the losses, Type536 breaks up the fluid flowing
through the collector into a series of nodes, each of which is
assumed to be isothermal and each of whose energy balance is
represented by a differential equation. The higher the number of
nodes the more accurate the temperature profile of liquid flowing
through the collector. As you increase the number of nodes the
outlet temperature should change less and less.<br>
Kind regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 3/6/2014 08:05, dev sharma wrote:<br>
</div>
<blockquote
cite="mid:CAFKvj4pe7QRuYHLPJtaxWNLygo8KyU3h-zCEFmoVCdq-9kWvSQ@mail.gmail.com"
type="cite">
<div dir="ltr">
<p class="MsoNormal">Hey All,<br>
</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Can someone please tell me the physical
significance of No. of
Nodes in modelling a solar thermal collector? or how is T_out
dependent on it? </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">My observation by running the model is that
T_out increases
with increase in number of nodes, but the effect is such that
T_out is
dependent on the exponential of this number somehow. Am I even
close to making
sense?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thanks</p>
<div>Dev Sharma<br>
<br>
</div>
</div>
<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>