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Re: [EnergyPlus_Support] SimHVAC: Maximum iterations ?



This error message means that after 20 iterations, the simulation did not pass 
all of the convergence checks.  When this warning is issued, the simulation 
keeps the results of the last iteration and proceeds to the next time step.  
Changing the max iteration limit to a smaller number will not help.  You can 
try setting it to 30 to see if it will converge with a few more iterations, but 
I suspect it will not help.

In general, when there are many max iteration errors like this, it means that 
something is wrong in the input that prevents the solution from converging, 
such as heating and cooling coils fighting with each other, or misconnected 
setpoint nodes, or component capacities that are far from what is needed.

You will probably need to submit your input file for help.

Mike


On 14 Aug 2007 at 15:19, love9787m wrote:

> While running the simulation, those warning message appeared.
> So I modified the value from 20 to 10 and 15 and 18 as described in 
> energyplus manual.
> But same warning is repeated. 
> In results, Indoor temperature is higher than expected.
> I think this problem is related to AirLoop.
> What is the problem ?
> Please tell what this error means and let me know the method for 
> this problem.
> 
> ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all HVAC 
> loops, at ULSAN - KOR IWEC DATA WMO#=471520, 07/01 00:15 - 00:30
>    ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all 
> HVAC loops, at ULSAN - KOR IWEC DATA WMO#=471520, 07/01 00:30 - 00:45
>    ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all 
> HVAC loops, at ULSAN - KOR IWEC DATA WMO#=471520, 07/01 00:45 - 01:00
>    ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all 
> HVAC loops, at ULSAN - KOR IWEC DATA WMO#=471520, 07/01 01:00 - 01:15
>    ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all 
> HVAC loops, at ULSAN - KOR IWEC DATA WMO#=471520, 07/01 01:15 - 01:30
>    ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all 
> HVAC loops, at ULSAN - KOR IWEC DATA WMO#=471520, 07/01 01:30 - 01:45
>    ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all 
> HVAC loops, at ULSAN - KOR IWEC DATA WMO#=471520, 07/01 01:45 - 02:00
>    ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all 
> HVAC loops, at ULSAN - KOR IWEC DATA WMO#=471520, 07/01 02:00 - 02:15
>    ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all 
> HVAC loops, at ULSAN - KOR IWEC DATA WMO#=471520, 07/01 02:15 - 02:30
>    ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all 
> HVAC loops, at ULSAN - KOR IWEC DATA WMO#=471520, 07/01 02:30 - 02:45
>    ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all 
> HVAC loops, at ULSAN - KOR IWEC DATA WMO#=471520, 07/01 02:45 - 03:00
>    ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all 
> HVAC loops, at ULSAN - KOR IWEC DATA WMO#=471520, 07/01 03:00 - 03:15
>    ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all 
> HVAC loops, at ULSAN - KOR IWEC DATA WMO#=471520, 07/01 03:15 - 03:30
> 
> ** Warning ** SimHVAC: Exceeding Maximum iterations for all HVAC 
> loops, during ULSAN - KOR IWEC DATA WMO#=471520 continues
> **   This error occurred 33924 times.
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> 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.pdf under the
> Documentation link 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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