Re: Error in simulation

["Dr.Karl-Christian Rauch" <Rauch-Muenster@xxxxxxxxxxx>]

Dear Anil,

please have a look to http://www.chi.on.ca/swmmqa457.html

or please have a look to GOOGLE web search machine (http://www.google.de)
with search string "forrtl: error (63): output conversion error"

The 'optical' error message coming from the fortran runtime library:
  The output field is too wide for the specified field format and the 
  number cannot be written with the correct precision

is obviously only an indication for a problem which insists in other reasons.
The model which is build according to the input file of type56, i think so, 
will run in a mathematical instable state.
This perhaps is due to the fact, that the model should investigate the 
performance of the window not only as an temperature point, but
also as a mass point  - are there any thermo-physical values given
for the pane, instead of an overall heat resistance?? An assumption
like this would lead -according to the immediately changes of the
pane temperature to totally wrong temperature values (instability)
and you would get after a short simulation time this optical error
message. You should search in this direction. Mathematical spoken
you try to find a solution for a 'stiff' problem, this is when objects
are treated with very different time constants.
Not really knowing this TYPE56, I think ITPANE 31 means for this
timestep 31 iterations for the pane's temperature calculation, and ITCALC 1 
would mean one iteration for the complete model (all other interesting
objects of this simulation run have been converging).

Kind regards
Dr.Karl-Christian Rauch
Asc.Member ASHRAE
SAP R/3 Application-Developer
ongoing Consultant for Tivoli Storage Management

----- Original Message ----- 
From: "Anil Misra" <anil_misra@mantraonline.com>
To: <trnsys@relay.doit.wisc.edu>
Sent: Wednesday, March 27, 2002 6:30 PM
Subject: Error in simulation


> Dear TRNSYS Users,
> 
> I am getting the follwoing error when I start simulation of a building. This
> error appears before the online plot could start.
> I request the experienced users to help me by telling why I am getting this
> error.
> 
> ----------------
> forrtl: error (63): output conversion error, unit (6), file
> c:\.........\xxxx.LST
> ----------------
> 
> and then in the xxxx.LST file I get several of the following errors.
> 
>  ***** ERROR *****        TRNSYS ERROR
>  TYPE 56, ZONE  1, SURFACE  5 PANE TEMPERATURE CALCULATION IS DIVERGING AT
> TIME      2.00000
>   TDIF:  NaN         ITPANE: 31 ITCALC:  1
> 
> I will be thankful for urgent help.
> 
> With kindest regards
> 
> Anil Misra
> New Delhi
> India
>