[TRNSYS-users] Stuck simulation

[Vincent Dolisy]

Dear David,

I am not an expert on debugging with TRNSYS but I have tried activating
the TRACE option for some components (TYPE 56, PID, Fans) and I have not
noticed any "non-convergence" in the inputs or outputs, just a large
number of calls:

*TRACE*  UNIT  51  TYPE  56  AT TIME   2.6764166666666665E+03  ITERATION  
 2  CALL   13105  POST-CONVERGENCE CALL. (can you tell me what it means?)

The simulation time step is 1 minute and if I use 5 minutes it does not
hang up at the same hour.

Moreover I have already encountered the problem during the night, that is
to say when the system is turned off (heating coils, cooling coils,
humidifiers, PID's are switched off).

Kind regards,
Vincent


> Vincent,
>   It is a bit hard to say without running your simulation from the
> debugger. I have run into some rare cases when the code got into an
> infinite loop internally. The fact that the problem happens at different
> times when you start it at different spots suggests that this might not
> be the case, however. Have you tried activating the TRACE function to
> see if you can see a non-convergence in the inputs and outputs before it
> hangs up?
> Kind regards,
>  David
>
>
> Vincent Dolisy wrote:
>> Dear TRNSYS users,
>>
>> I am trying to run a rather big simulation (building + system) with
>> TRNSYS. The maximum number of outputs was exceeded so that I increased
>> this value in the source code.
>>
>> When I run a simulation from the hour 0 until 3000 the "TRNEXE-plotter"
>> stops at the hour 2678.58 with a classical "This program does not
>> respond"
>> (the percentage of processor used is 50%, this means TRNSYS is still
>> running). There is no error message and I have to use CTRL+ALT+DEL to
>> stop
>> the program. I have checked some simulation variables (temperature,
>> humidity, PID,...) just when the program stops (Hour=2678.58) but
>> everything looks normal.
>>
>> When I run the simulation from the hour 2600 until 3000 I have the same
>> problem but it happens one hour earlier (2677.80).
>>
>> I have also tried to run from 2600 until 2680 to see if TRNSYS can
>> finish
>> the simulation (although the plotter is stuck), but it cannot.
>>
>> Does anyone have an idea about the causes of this problem (convergence
>> in
>> TRNSYS, Windows XP,...) ?
>>
>> Thanks
>>
>> Kind regards,
>>
>>
>
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-- 
Vincent DOLISY
Ingénieur de recherche

Université de Liège
Département des Sciences et Gestion de l'Environnement
Unité de Surveillance de l'Environnement (Energie)
185, Avenue de Longwy
B-6700 ARLON
Tel : 32-(0)63 230 937
Fax : 32-(0)63 230 800
Mail: Vincent.Dolisy at ulg.ac.be
WEB : http://www.dsge-arlon.ulg.ac.be/energie/