[TRNSYS-users] TRNsys TYPE 22 Multi Surfaces Problem

[Currie, Sam R]

Wirich,

Someone correct me if I'm wrong but I believe that with 3D geometry TRNSYS requires each individual surface to "see" each other surface in each zone and by splitting the wall in two you create two surfaces with zero view factor between them.

Sam Currie
Purdue University

From: Freppel, Wirich [mailto:Wirich.Freppel at saint-gobain.com]
Sent: Thursday, May 16, 2013 5:32 AM
To: trnsys-users at cae.wisc.edu
Subject: [TRNSYS-users] TRNsys TYPE 22 Multi Surfaces Problem

Dear TRNsys users,

When I set up a cubic room with Google sketch up and then import it into TRNSys 17 I can easily calculate the temperature of each surface (6). Also I can set up the temperature of one surface to a set point temperature and control it with a "POWER" variable which is determined in TRNbuild.
So basically I heat one wall and calculate the temperature of the other wall plus the air temperature.

When I try to divide this wall into several, let's say 2 walls (by using Google Sketch up to separate the walls)  heating only one small wall (so half of the entire wall) becomes impossible. I get this error message :
Fatal Error at time   :         1.000000
    Generated by Unit     :    56
    Generated by Type     :    56
    Message               : outside temperature of    2 (external) wall in zone   1 at time     1.00 not converged!

Which I don't understand. Is it possible to heat only a part of the wall?

It definitely works with entire walls but not with separated wall.

Thanks a lot in advance.

Wirich
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