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Re: [TRNSYS-users] ORC in TRNSYS (16.0 or 17.0)



Stephan,
  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.

  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 (http://www.nist.gov/srd/nist23.cfm) which can return refrigerant properties of quite a few different fluids. Reviving that Type might be the simplest way to proceed.
Kind regards,
 David




On 2/2/2012 07:03, stephanlangbsc@aol.de wrote:
Ladies and Gentlemen,

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).
Is there any Library or type known for an ORC-turbine or for an complete ORC-Process?
Or does anybody knows any other possibility to simulate an ORC in TRNSYS?


I tried to change the STEC-Library into using another working fuid than water, but i failed to change the steam-turbine. Evaporator and
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.
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
"C*********** ENTHALPY OF SUP. HEATED GAS AS FUNCTION OF PRES. AND ENTROPY*******"
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.
Maybe someone knows about that issue?

Thank You and Kind Rgards

Slang



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