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Laplace, 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. 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. Best, David On 8/25/2013 13:06, Laplace Bessel
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-- *************************** 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 |