[EnergyPlus_Support] Re: Fwd: Warning: Maximum iterations exceeded

["anarui.oliveira" <anarui.oliveira@xxxxxxxxx>]

I didn't worry too much, at first, because the temperature control is 
actually pretty good.
The thing that got me worried is that the warnings are pretty 
repetitive (estimating nº of warnings over nº of predefined time 
steps, 4 per hour, about 40% have warnings).

Thanks,
Ana.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad 
<RRaustad@...> wrote:
>
> I'm not so sure smoothing schedules will help to any degree. You 
may 
> have been reading a post with regard to the zone temperature being 
> slightly lower than the zone temperature set point. I think you 
should 
> look at how the zone temperatures are controlled with respect to 
the 
> zone temperature set point. Even when the maximum iteration limit 
is 
> exceeded, the error in the predicted energy use can be very small. 
> Checking your results should always be the final step in any 
simulation.
> 
> anarui.oliveira wrote:
> >
> > I have browsed through old messages mentioning this topic, and 
got the
> > idea that maybe the fact that internal gains' schedules change 
quite
> > abruptly can contribute to this problem?
> > If I "smooth" this schedules (by detailing, in smaller intervals, 
the
> > equivalent linear variations of the original hourly schedules), 
could
> > it help?
> >
> > In any case, when I get these warnings, how can it affect the 
energy
> > loads estimates?
> >
> > Thanks again for any help,
> >
> > Ana.
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx 
> > <mailto:EnergyPlus_Support%40yahoogroups.com>, "anarui.oliveira"
> > <anarui.oliveira@> wrote:
> >
> > Any hints about the possible causes and effects of the Maximum
> > iterations warnings?
> >
> > ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all 
HVAC
> > loops, at Leiria PRT INETI data WMO#=085360, 08/01 10:15 - 10:30
> >
> > ** Warning ** SimHVAC: Exceeding Maximum iterations for all HVAC
> > loops, during Leiria PRT INETI data WMO#=085360 continues
> >
> > Thanks in advance,
> > Ana Rui.
> >
> > --- End forwarded message ---
> >
> >  
> 
> -- 
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL  32922-5703
> Phone:   (321) 638-1454
> Fax:     (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec.ucf.edu
> 
> UCF - From Promise to Prominence: Celebrating 40 Years
>



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