Re: [EnergyPlus_Support] SimHVAC: Maximum iterations

[Zhen Tian <tianzhen9@xxxxxxxxx>]

Thanks, Mike.

I do use "variable flow" in my simulation model. I tried to change  to detail cooling coil, change the chiller water temperature, and etc. But nothing worked.

I have uploaded my input file to the yahoo group.

Thanks for your help.

Regards,
Zhen

"Michael J. Witte" <mjwitte@xxxxxxxx> wrote:                               There is a known control problem when using more than one ConstantFlow chiller 
 (CR7347, fixed for version 2.1).  Take the expidf output file, and change the 
 chiller objects to be "VariableFlow" instead of "ConstantFlow".  This should 
 get rid of the max iteration errors.  The chilled water loop pump should still 
 controll the overall chilled water flow and send excess flow through the bypass 
 pipe, so this should be equivalent from an energy perspective.  If this does 
 not help, please send the input file to energyplus-support@xxxxxxxx or post it 
 in the files area of the yahoo group.
 
 Mike
 
 On 19 Oct 2007 at 14:40, Zhen Tian wrote:
 
 > Dear all,
 > 
 > I am modeling a building with VAV system. I got lots of warnings: SimHVAC:
 > Maximum iterations when I change one big to several small chillers. I changed
 > the setting in iterations from 20 to 50 and so on, but I still got these
 > warnings.
 > 
 > I used the compact HVAC to generate the HVAC system. Is there any method to get
 > rid of these warnings.
 > 
 > Thanks a lot.
 > 
 > Regards,
 > 
 > David
 > 
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 ========================================================
 Michael J. Witte, GARD Analytics, Inc.
 EnergyPlus Testing and Support      
 EnergyPlus-Support@xxxxxxxx
 
 
     
                               

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