[TRNSYS-users] A lot of convergence warnings

[Mavi Cambronero Vázquez]

Thanks for your answers.....

I´ve noticed that the problem is the chilled ceiling used. It´s the first
time that I try to use it and I supose I didn´t succeed. I know how to
create a chilled ceiling layer, but I´m not sure what are the following
steps. What I did was integrate the new layer as the last one in a new wall.
TRNBuild said to me that a wall with chilled ceiling can´t be external,
boundary or internal, so the only option is that it is adjacent.... adjacent
to the roof???So I created a new zone called roof! I´m a bit confused.

If someone could help me I´d be very grateful!

Thanks


2010/4/29 <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... :(
>
>
> ------------------------------------------------------------------------------------------------------------
> Meld deg på vårt nyhetsbrev på www.niva.no
>
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