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Laplace,<br>
I am not sure that TRNSYS is the correct tool to use in this case
and I might steer you towards something like EES (Engineering
Equation Solver) instead. The heat exchanger components in TRNSYS
that might be the basis for your evaporator and condenser are quasi
steady state models meaning that they do not account for the thermal
capacitance of the heat exchanger material or the fluid. They also
ignore short term transient behaviors that may be important to your
modeling. Lastly, they assume that the working fluid does not change
phase. I think you would probably have to write models for all the
various parts of the chiller. If there is an advantage to writing
such models then of course you can do so but be careful in
connecting components that have been designed to model very short
term transients with components that have been designed for use with
longer time steps.<br>
<br>
EES is a more pure equation solver than TRNSYS, especially in that
it can solve simultaneous equations. It is not too challenging to
write the equations that govern the refrigeration process and EES
has got a number of built-in functions that will return the
thermodynamic properties of a lot of refrigerants.<br>
Best,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 8/25/2013 13:06, Laplace Bessel
wrote:<br>
</div>
<blockquote
cite="mid:1377453989.66143.YahooMailNeo@web141504.mail.bf1.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff; font-family:times
new roman, new york, times, serif;font-size:12pt">Hello trnsys
users,<br>
Does anyone know how to model a chiller as its components i.e.
evaporator, condenser, compressor in Trnsys? Any pointers would
be very appreciated.<br>
<br>
Laplace<br>
<div><br>
</div>
</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
<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>
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