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Ayman,<br>
Since flow is driven between airnodes by both pressure and
temperature differences, I would assume that the air density is
calculated. I do not know what model is used, however. It may be
that TRNFlow (Type56) calls the TRNSYS kernel routine
"psychrometrics" to determine the density of dry air. You can look
at the psychrometrics section in the Programmer's Guide or at the
code to learn about its algorithm.<br>
Kind regards,<br>
David<br>
<br>
On 8/17/2011 09:41, Ayman Sarwa wrote:
<blockquote
cite="mid:1313592106.99226.YahooMailNeo@web161610.mail.bf1.yahoo.com"
type="cite">
<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255,
255); font-family: arial,helvetica,sans-serif; font-size: 18pt;">
<div style="font-family: arial,helvetica,sans-serif;"><span>
<div class="MsoNormal"><span lang="EN-US">Hi every
body <o:p></o:p></span></div>
<div class="MsoNormal"><span lang="EN-US">According
to define the fan inside Trnflow, the air density is
defined at test condition.
<o:p></o:p></span></div>
<div class="MsoNormal"><span lang="EN-US">Anyone have
Knowledge about how the air density treated inside
Trnflow ?<o:p></o:p></span></div>
<div class="MsoNormal"><span lang="EN-US">Is it
considered constant or calculated internally? if it is
calculated, what is the
mathematical method used?<o:p></o:p></span></div>
<div class="MsoNormal"><span lang="EN-US">thanks <o:p></o:p></span></div>
<div class="MsoNormal"><span lang="EN-US">Regards<o:p></o:p></span></div>
<div class="MsoNormal"><span lang="EN-US">Ayman<o:p></o:p></span></div>
</span></div>
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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
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