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

[Rabah DJEDJIG via TRNSYS-users <trnsys-users@lists.onebuilding.org>]

Dear Merk;
thank you for your reply. Quser is not an T56 output.
just after sending my message, I immediately solved my problem. The solution consist just to eliminate QSKY not as I have written before the equation but by setting the on emissivity to 0 on back side.

Best,

Rabah

2016-07-05 16:42 GMT+02:00 hotline <hotline@transsolar.com>:

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@transsolar.com

Web:      www.trnsys.de

 

 

 

Von: TRNSYS-users [mailto:trnsys-users-bounces@lists.onebuilding.org] Im Auftrag von Rabah DJEDJIG via TRNSYS-users
Gesendet: 05 July 2016 15:46
An: TRNSYS-users@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