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Stephan,<br>
I am not aware of an existing ORC model for TRNSYS. The one time
that we needed to model one, we took a simplified overall efficiency
approach. The cycle efficiency depended on some time dependent
variables but we did not model the actual components of the cycle.
About a year ago, a client approached us about writing a
component-based cycle model but the project didn't proceed. <br>
<br>
As I think you have discovered, most (if not all) of the power
producing components available use steam as the working fluid. They
call various steam properties routines internally. It would not be
all that difficult to change the models to call a property routine
for some other working fluid. The real complication comes in writing
or obtaining the property routine for that other fluid. The routine
would have to be able to return all of the state properties
(density, temperature, pressure, enthalpy, entropy, quality, etc.)
based on knowing any two of those properties. Some years ago, there
was a TRNSYS component written to transfer information between
TRNSYS and a software tool called REFPROP
(<a class="moz-txt-link-freetext" href="http://www.nist.gov/srd/nist23.cfm">http://www.nist.gov/srd/nist23.cfm</a>) which can return refrigerant
properties of quite a few different fluids. Reviving that Type might
be the simplest way to proceed.<br>
Kind regards,<br>
David<br>
<br>
<br>
<br>
<br>
On 2/2/2012 07:03, <a class="moz-txt-link-abbreviated" href="mailto:stephanlangbsc@aol.de">stephanlangbsc@aol.de</a> wrote:
<blockquote
cite="mid:8CEAFC2344DC59A-528-B625@webmail-d149.sysops.aol.com"
type="cite"><font size="2" color="black" face="arial"><font
size="2" color="black" face="arial">
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style="font-family:arial,helvetica;font-size:10pt;color:black">
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<font size="2" color="black" face="arial"><font size="2"
color="black" face="arial"><font face="Arial,
Helvetica, sans-serif">Ladies and Gentlemen,<br>
<br>
I am about to model a CHP-System with solarthermal
heat and an ORC power generation in TRNSYS 16.0
(TRNSYS 17.0 is also available).<br>
Is there any Library or type known for an
ORC-turbine or for an complete ORC-Process?<br>
Or does anybody knows any other possibility to
simulate an ORC in TRNSYS?<br>
<br>
<br>
I tried to change the STEC-Library into using
another working fuid than water, but i failed to
change the steam-turbine. Evaporator and <br>
Condenser could be adapted to another fluid by
changing the tables with thermodynamic values in
boil.for, by compiling extra dll-files for those
types and by deactivating the stecdll.dll. <br>
To adapt the turbine I need to change steam3.for and
Steam_C.for as well, but I dont understand what
exactly the equations in steam3.for in the section <br>
"C*********** ENTHALPY OF SUP. HEATED GAS AS
FUNCTION OF PRES. AND ENTROPY*******"<br>
describe and i couldnt find out, where the data
comes from. So I couldnt change those equations into
describing the thermodynamic behaviour of another
fluid.<br>
Maybe someone knows about that issue?<br>
<br>
Thank You and Kind Rgards<br>
<br>
Slang<br>
<br>
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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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