[TRNSYS-users] A lot of convergence warnings

[knut.erik.enerstvedt at niva.no]

In addition to reducing time step length, I would try the following:

- Check if there is sufficient thermal mass in your system (add pipes in 
fluid loops, for example).
- Use controllers (such as Type 2) instead of equations (LT, GT and 
similar) when variables that can change from one iteration to the next are 
involved.
- Place components in a "natural" calling order (controllers before 
controlled equipment, for example): Control cards->Component order: Click 
and drag the different components to order them.
- Use an online plotter to check if there are any unrealistic output 
values (very high temperatures, for example).

Best regards,
Knut Erik Enerstvedt




>You could change the simulation time step (in steps of 1/(2^n) so 1 hour, 
0,5 hour, 0,25 hour etc). You can find this by assembly -> component 
>order.
 
>Good luck,
 
>Mariëlle Nuchelmans
 
 
>Hi,
 
>What can I do when there are lots of convergence problems??? The same 
project has different warnigs because of that if the simulation >starts at 
3896 than if it starts at 0.... Does the option "Optimaze component order" 
work?? If I select that option other errors appear... :(
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