Re: [EnergyPlus_Support] Problems about Loads Initialization did not Converge

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

If the initialization converges with PURCHASED AIR, but not with the fancoil 
system, then it is highly likely that the problem is with the fancoil system.  
If the HVAC system does not provide adequate conditioning, the building will 
drift toward the outdoor conditions each day of the initialization and fail to 
converge.

How to fix it?  Report the zone temperatures, fan power, coil loads, 
boiler/chiller, loads, pump power, etc.  You should be able to figure out what 
is running and what is not, and then check the inputs for the reason.

Mike


On 22 Nov 2007 at 2:19, maize_lee wrote:

> Hi all,
>   I have a warning in  an office building model,fancoil system:Loads 
> Initialization did not Converge.
> 
> ** Warning ** Loads Initialization did not Converge 
> (CheckWarmupConvergence) after 25 warmup days.
>    **   ~~~   ** ..Environment=SHANGHAI ANN HTG 99.6% CONDNS DB
>    **   ~~~   ** ..Max Temp Comparison=2.37 vs Temperature 
> Convergence Tolerance=0.40 - Fail Convergence
>    **   ~~~   ** ..Min Temp Comparison=1.88E-004 vs Temperature 
> Convergence Tolerance=0.40 - Pass Convergence
>    **   ~~~   ** ..Max Heat Load Comparison=7.7321E-006 vs Loads 
> Convergence Tolerance=4.00E-002 - Pass Convergence
> 
> But when I simulated this model with purchased air to calculate 
> building load, there is no warning or error. So, is  it the problem 
> that something is wrong with the HVAC system? What should I do ?
> 
> Thanks a lot!
> maize_lee
> 
> 
> 
> 
> 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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