[TRNSYS-users] Invalid floating point operation: strangebehaviour

[David Bradley]

Matteo,
  An invalid floating point error is usually an indication that there is 
a division by zero. As you noted, if you turn on the debugging mode in 
Studio, it will check for that condition among the outputs of a 
component. However, Werner and the others are quite correct that you 
should try to run your simulation from the Compaq compiler and walk line 
by line through your code to try and determine where that division by 
zero is occurring.
Best,
 David


Matteo DF wrote:
> Hi again,
> my trnsys version is 16.00.0038 so it's not the most recent one... 
> Anyway under UserLib I have the two folders you've mentioned, 
> ReleaseDlls and DebugDlls. Probably the installation of TESS models 
> created them, so my version is a bit old.
>
> Anyway, trying to run my simulation in debug mode I discovered that 
> there's another unit which is giving NaN as output... In fact type 
> 534, vertical storage tank, by Tess is producing error 419 with the 
> output 1, which is directly connected to the type I was developing. 
> This output 1 is the temperature at outlet and I don't know how it's 
> possible that it influences so much the simulation.
> I'll check again the implications of this temperature.
>
> Thanks for your help!
> Matteo.
>
>
>
> -- 
> La scoperta è vedere ciò che tutti hanno sempre visto e
> pensare ciò che nessuno ha mai pensato.
> (Albert Szent-Gyorgyi, scopritore della vitamina C e premio Nobel)
>
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Thermal Energy System Specialists (TESS), LLC 
David BRADLEY                      22 N. Carroll Street - Suite 370 
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                                   USA
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