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Fabio, It depends on how the ORC has been modeled. If you are using a non standard Type that was developed to model an ORC then it may be as simple as changing a parameter. If the ORC is modeled by a series of standard components that make calls to TRNSYS's STEAM routines then changing fluids is very difficult; you would need to modify the Types so that they call a routine that generates all of the state properties for the ORC fluid that you want to work with. There are a few other possibilities as well: One alternative is that you can model the ORC a bit more simply using a performance map approach. In this approach, you would use Type42, which simply reads and interpolates a data file. You would have to identify the independent variables of the ORC (source temperature, sink temperature, fluid flow rate, etc.). You would have to then provide the values of the dependent variables (you have to identify these as well) for each possible combination of independent variables. Another alternative is to model the ORC in either Excel or EES and then call the model from TRNSYS using Type62 or Type66. EES would probably be the easiest since it has a large library of thermophysical properties built into it. Kind regards, David On 11/25/2011 02:57, fapilt@libero.it wrote:
-- *************************** 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 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com |