Re: [EnergyPlus_Support] VAV Max Iterations

["Michael J. Witte" <mjwitte@xxxxxxxx>]

I uncovered a problem with the order of the controllers in the COMPACT 
HVAC:SYSTEM:VAV controller list.  This will be fixed for the upcoming release.  
However, fixing the controller order does not eliminate the max iteration 
errors.

In this case, it seems to be because the central heating coil and cooling coil 
setpoints in the VAV air loops are too close to each other.  The cooling 
setpoint is 12.778C, and the heating setpoint is 12.222C.  Changing the heating 
coil setpoint to 10.0C eliminated the max iteration errors on the design days, 
but not on the annual simulation - but without fixing the order of the 
controller list.  Removing the central heating coil and letting the reheat 
coils handle all of the heating loads also eliminated the max iteration errors 
on the design days.  

I will look at this further next week.

Mike


On 22 Sep 2006 at 19:22, asheaffe wrote:

> Like some others, I am having trouble with a VAV system.  The max 
> iterations errors are returned (several thousand) and I cannot figure 
> out how to mitigate them.  I uploaded the zip file "HospitalRecoiled", 
> can anyone figure out what is wrong here?
> 
> Thanks,
> 
> Andrew
> 
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
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> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press the
> "search" button.
>  
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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