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Re: [TRNSYS-users] Error: pane temperature calculation is diverging



Nikolai,
You might try taking your window data and putting it into the "restaurant" example in place of the existing window there. That will tell you if there is a problem with the window data or if something in the zone is causing the problem. You might also turn off any automatic heat transfer coefficient calculations on the inside surface of the window. Also make sure that you do not accidentally have a zero value for the convection coefficient on the outside of the window; I've made this mistake in the past by telling TRNBuild that I wanted the outside surface convection coefficient to be an input and then forgetting to connect that input to some realistic value.
Kind regards,
David

Nikolai Artmann wrote:

Hello

I’m getting the following error message:

Message : Zone 2 surface 4 pane temperature calculation is diverging at time 0.25000TDIF: NaN ITPANE: 31 ITCALC: 51

*.lst-file in attachment.

Zone 2 surface 4 is a window (ID number 13112). I used the same window also in zone 1 without any problems. Only since I copied the zone and changed some parameters I get this message. If I delete the window from zone 2, I get the same message for the window in zone 1. If I delete the zone 2 completely the simulation runs without a problem.

Any Ideas?

Thanks, Nikolai

**Nikolai Artmann**

3-Plan Haustechnik AG, Winterthur
Telefon 052 / 234 70 66
Telefax 052 / 234 70 60
e-Mail: nikolai.artmann@3-plan.ch <mailto:nikolai.artmann@3-plan.ch>

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