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Re: [TRNSYS-users] convergence problem

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