[TRNSYS-users] Chiller breakdown

[David BRADLEY]

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 wrote:
> Hello trnsys users,
> Does anyone know how to model a chiller as its components i.e. 
> evaporator, condenser, compressor in Trnsys? Any pointers would be 
> very appreciated.
>
> Laplace
>
>
>
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> TRNSYS-users at cae.wisc.edu
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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 at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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