[TRNSYS-users] Outside temperature of an external wall at time XXX not converged!

[hotline via TRNSYS-users]

Dear Rabah,

am I understanding you correct:

-          Quser, QSKY_S1-ABS and TSO_S1 are outputs of Type 56

-          You take these outputs and use them for your surface gains

This will definitely cause convergence problems since you manipulate a balance by using outputs of this balance.
You will have to find a different solution for your task.

Best
Jakob Merk

_________________________________________________________________________________________________

Jakob Merk
TRNSYS Software Team

Transsolar Energietechnik GmbH
Curiestraße 2
70563 Stuttgart
Fax:        +49 711 67976-11
Email:    hotline at transsolar.com<mailto:hotline at transsolar.com>
Web:      www.trnsys.de<http://www.trnsys.de/>



Von: TRNSYS-users [mailto:trnsys-users-bounces at lists.onebuilding.org] Im Auftrag von Rabah DJEDJIG via TRNSYS-users
Gesendet: 05 July 2016 15:46
An: TRNSYS-users at lists.onebuilding.org
Betreff: [TRNSYS-users] Outside temperature of an external wall at time XXX not converged!

Dear all,
Please, can any one help me to fix this problem:

For some reason, I try to do the following operation on the outside surface (S1) of an external wall (with type 56 and an equation):

surf. gain outside_S1 = Quser+QSKY_S1-ABS*IT_S1-HCONVO_S1*AREA_S1*(TAMB-TSO_S1)
i.e. eliminate on this surface all gains calculated automatically by Type 56 and add instead a user defined gain Quser.


This seems to work perfectly at the beginning of the simulation before arising this error:

Message: outside temperature of 1 (external) wall in zone 1 at time  2419.00 not converged!
I tried to modify Convergence tolerance, to change the components torder, etc ... fruitlessly
Best regards,
Rabah
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