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Mlle Anis,<br>
It is not possible to directly change the tube diameter. The tube
diameter has an impact on the intercept efficiency, the first and
second order loss coefficients and on the concentration ratio. You
may be able to calculate these values based on some theoretical
knowledge of the collector that you are trying to model by using
equations that are presented in a text book such as "Solar
Engineering of Thermal Processes" <br>
Kind regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 2/13/2014 09:19, Messaouda Anis
wrote:<br>
</div>
<blockquote
cite="mid:1392304796.22857.YahooMailNeo@web172502.mail.ir2.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff;
font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial,
Lucida Grande, sans-serif;font-size:12pt">
<div>Dear Trnsys_users,<br>
</div>
<div style="color: rgb(0, 0, 0); font-size: 16px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;">For the type 536</div>
<div style="color: rgb(0, 0, 0); font-size: 16px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;">please it is possible to change the
diameter of a tube. </div>
<div style="color: rgb(0, 0, 0); font-size: 16px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;">thank you</div>
</div>
<br>
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<br>
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</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>
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