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

[David Bradley <bradley@tess-inc.com>]

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@engr.wisc.edu
> https://www.cae.wisc.edu/mailman/listinfo/trnsys-users

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