[TRNSYS-users] Convergence problems

[Maragna Charles]

Hello,

In my view you should not increase the number of allowed warnings – your model gives irrelevant results, you should not rely on the results.

In the setting menu, I would first try the following (I use the 1st 2 suggestions for all simulations) :

-        Decrease the minimum relaxation factor (setting #1) – let’s say to 0.01

-        Increase the « number of Iterations Before Warning » (setting #10) – sometimes I use up to 1000+ iterations

-        Optimize the order of components in the subsequent tab.

Best wishes,
Charles


[cid:image023.png at 01D6E9DB.6AE4FDB0]
Charles MARAGNA
Energy Modelling Engineer
Georesources Division – Geothermal energy and energy storage Unit

3 av. Claude-Guillemin - BP 36009 - 45060 ORLÉANS Cedex 2 - France
Tél : +33 (0)2 38 64 37 51 / c.maragna at brgm.fr<mailto:c.maragna at brgm.fr>
BRGM – FRENCH GEOLOGICAL SURVEY / www.brgm.eu<http://www.brgm.eu>

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De : Julien Gambade <julien.gambade at univ-ubs.fr>
Envoyé : lundi 5 décembre 2022 14:24
À : trnsys-users at lists.onebuilding.org
Objet : [TRNSYS-users] Convergence problems

Dear Trnsys users,

I have some problem with convergence issues. I am working with a simulation with a duration of several months and a timestep of 5 min.

For several time steps, some inputs do not converge and after a certain time, the amount of warnings exceeds the number of warnings before error.

Two options allowed me to end the simulation : increase the number of warnings allowed and use Type "delayed inputs" (last option results in a change in my outputs).

Do you think the first solution is fine or should I go to the second solution ? Or, does anyone know an other solution I could try ?

Best regards,
--
Julien GAMBADE
Doctorant
Institut de Recherche Dupuy de Lôme (UMR CNRS 6027)
Centre de recherche Christian Huygens
Rue de Saint-Maudé - 56100 Lorient - France
julien.gambade at univ-ubs.fr<mailto:julien.gambade at univ-ubs.fr>
www.irdl.fr<https://urldefense.com/v3/__http:/www.irdl.fr__;!!KbSiYrE!nmNdeOhAR67FHZ3X9_DM_kBWZnFmRYIKKCzPBgjuqyQ5KcBgbN_KhA2wgPOT55oLvd5NJpR4f8uYVYMbLC9SGo8ypNmJOzwCxd2FhQ$>
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