Re: [EnergyPlus_Support] SimHVAC: Maximum iterations exceeded for all HVAC loops

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

Maximum iteration errors are usually related to mass flow or temperature 
problems around the loop.  This occurs when the air loop side is doing 
something contrary to the zone equipment.  Examples of situations which may 
cause this include:  sum of peak terminal unit airflows does not equal the peak 
supply fan air flow, node connection errors, bad control nodes, incorrect use 
of active and passive branches, inconsistent equipment schedules, and 
inconsistent control setpoints.  

Mike


On 3 Dec 2003, at 14:05, mikemccarty79 wrote:

> Hi
> 
> I am having problems with my model and getting the following warning 
> message: SimHVAC: Maximum iterations exceeded for all HVAC loops.  I 
> get about 15 of these warnings and then one that says:   
> ** Warning ** SimHVAC: Exceeding max iterations continues...50
> ** Warning ** SimHVAC: Exceeding max iterations continues...100  
> Does anyone have any suggestions of attack for debuging this 
> problem?  Thanks
> 
> Mike McCarty
> Graduate Student, Mechanical Engineering
> Iowa State University
> 2043 Black Engineering
> Ames, IA 50010
> 515-294-3080
> mmccarty@xxxxxxxxxxx
> 
> 
> 
> 
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx


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