[TRNSYS-users] PARAMETRIC STUDIES

[David Bradley]

Bertrand,
   The basic idea is that you have to open your 
simulation in TRNEdit and select "New Table" from 
the Parametrics menu. TRNSED will scan through 
your input file and find all CONSTANTS statements 
then allow you to select which CONSTANTS are 
going to be parametrized in the table. The 
concept of CONSTANTS is a little confusing 
sometimes for users most familiar with the Studio 
but a  CONSTANT is simply a simple equation. If 
you have created a simple equation in your Studio 
project that sets the value of a constant (called 
MyVariable in this example), the Studio will have written:

EQUATIONS 1
MyVariable = 45

in your input file. You would need to replace that in TRNEdit with:

CONSTANTS 1
MyVariable = 45

before TRNEdit would realize that the variable could be parametrized.

Once you have created the table, you select "Run 
Table" from the TRNSYS menu and TRNSYS will run 
repeatedly with all of the combinations of 
variables in your table. The other thing to keep 
in mind is that you should either set all of your 
printers to "append mode" (one of the parameters) 
or you should make sure that all of your output 
files have the same name as your input file 
(*.dck).  When running a parametric table, 
TRNEdit automatically duplicates all output files 
that have the same name as the input file and it 
overwrites any output file that does not. By 
setting printers to "append" though, you can avoid the overwrite.
Cheers,
  David


At 02:53 4/27/2007, tchanche fankam bertrand wrote:
>greetings to all,
>
>Thanks to Adrien and David for the help they gave me for type 55.
>
>I would klike to know how to perform  parametric 
>studies. I red the manual, but i don't 
>understand very well how i should proceed. i will be grateful for any help.
>
>yours,
>
>
>------------------------
>TCHANCHE FANKAM Bertrand
>
>C/O SUH Christopher
>22 kadmeas-BOTANIKOS
>Athens, GREECE
>mobile:+30 69 42 95 59 52
>
>
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Thermal Energy System Specialists (TESS), LLC
David BRADLEY                           2916 Marketplace Drive - Suite 104
Partner                                        Madison, WI 53719
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