[TRNSYS-users] Type 60 (TRNSYS 15) Internal warning message...

[David Bradley]

Dear Lorenzo,
   We addressed some problems with Type60's heat exchanger UA calculation 
in TRNSYS 16. However, in TRNSYS 15, you might have some luck by changing 
the Type60 internal time step parameter (parameter 28)
Kind regards,
  David


At 10:33 3/13/2006, Lorenzo Zamboni wrote:
>Dear all,
>     I am a TRNSYS 15 user and I am facing problems with type 60 used to 
> simulate a tank with 1 internal heat exchanger.
>     Simulation seems to go on without problems but into the list file a 
> warning message is sent by the type 60 when trying to solve the heat 
> exchanger internal  heat transfer coefficient (UAhx) like the following:
>  %%% TYPE60 WARNING:  UAhx UNABLE TO
>  CONVERGE IN 500 ITERATIONS AT TIME=
>    8.000000             500 %%%
>
>     I tried to change the number of nodes, the size of the heat exchanger 
> and/or tank but that warning still continues to appear almost for all the 
> timesteps (I am using 1/4-hour simulation timestep). I do not think I can 
> trust those calculations while these warnings exists.
>     Please, let me know if someone knows some possible solution\explanation.
>
>Thank you,
>Lorenzo
>_______________________________________________
>TRNSYS-users mailing list
>TRNSYS-users at engr.wisc.edu
>https://www.cae.wisc.edu/mailman/listinfo/trnsys-users

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Thermal Energy System Specialists (TESS), LLC
David BRADLEY                           2916 Marketplace Drive - Suite 104
Partner                                        Madison, WI 53719
Phone: (608) 274-2577 USA
Fax: (608) 278-1475
E-mail: bradley at tess-inc.com
Web Pages:  http://www.tess-inc.com     and      http://www.trnsys.com

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