[TRNSYS-users] convergence problem

[Diego A. Arias]

Hi Fredery,

If I understand correctly, you have a problem with cycling information 
that is getting in to an infinite loop.

One solution is to add some inertia to your system. You did not specify 
if you have a Type56 in your simulation, or another load.  You may want 
to add a pipe (Hydronids/Pipe_duct/type31), which adds some inertia to 
the system. 

Another solution is to use an input value recall 
(Utility/InputValueRecall/Type93): you can set it up so it keeps track 
of the value of a variable during previous time steps; this is an 
artificial way of adding inertia to your system.  If you try out this 
solution, please run a sensitivity analysis with the time step to make 
sure that you are getting appropriate solutions, and that energy is 
being conserved in your system.
Best regards,

Diego

fredery lavoye wrote:
> Hi
> I try to simulate a heating by ventilation. To know the temperature I 
> want to use for the heating at a timestep, I need the Qheat at this 
> time step. So I do an iteration with type 155; while Qheat is 
> different to zero make (T+0.1). But the simulation doesn't 
> converge!It's due to the Qheat which linked to the ventilation.
> How can I solve this problem?
> Please help me.
> Best regards,
> Fredery.
>
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-- 
Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706