[TRNSYS-users] Speeding up TRNSYS simulation times?

[David BRADLEY]

Daniel,
  I don't think that modifying the tolerances is going to help; it will 
more likely lead to convergence problems. You could consider increasing 
the timestep. The PV models are all quasi steady state models and so 
don't have any capacitance effects in them. Unless you are doing some 
fancy controls that require a short tiemstep, you could consider making 
it longer.

  I suspect that almost all of the simulation time is in the 
communication back and forth between Excel and TRNSYS. If you look at 
the *.lst file produced when the simulation runs you should find a 
breakdown of how much time was spent in each components.
Kind regards,
  David



On 9/15/2014 02:57, Daniel Tallos wrote:
>
> Hi,
>
>
> I have two projects running, both simulations for 25 years of 
> PV-battery systems. The first contains an Excel input type which acts 
> as a discharge controller, and the second is identical but without the 
> Excel type. It takes approximately 2-5 minutes to run the non-Excel 
> type project simulation for 25 years. So far I have calculated that 
> the 25 year simulation including the Excel model will take 2 
> hours.........
>
>
> Is there any advice for speeding up this simulation time (i.e. can I 
> change the tolerances? etc.) because I don't think this will be good 
> enough for the amount of runs I will be running.
>
>
> Thanks.
>
>
> Daniel.
>
>
>
>
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> TRNSYS-users at lists.onebuilding.org
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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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