Re: [EnergyPlus_Support] Warning

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

v1.0.2 had a bug with multiple DX coils in the same run.  This is 
fixed in version 1.0.3.  v1.0.3 also has some refinements to the 
plant loop simulation.  So, the first thing to do is run these in 
v1.0.3.  If the problem persists, then look at things like pump and 
fan controls.  If you cannot solve it, then send me the idf file or 
upload to the yahoo files area.

Mike


On 5 Dec 2002, at 22:20, HSIEH Chun-Ming wrote:

> Hi,
> 
> If this warning message occurs only once or twice, we can ignore that.
> Then, how about the following two examples, are their simualtion
> results still correct? If not, how to slove them?
> 
> 1. In a 7-floor building, each floor has a window air conditioner. And
> there are 14 warning showed here, 2-3 warning messages for each window
> air conditioner in each floor. ** Warning ** AIR
> CONDITIONER:WINDOW:CYCLING -- Exceeded max iterations while adjusting
> compressor runtime to meet the zone load within the cooling
> convergence tolerance.
>    **   ~~~   ** For WindowAC=ZN002WINDAC, Iterations=50
> 
> 2. For the case of a 12-floor building with a central system 
> (water-cooled type):
> The message showed 15 times,
> and most of the messages occurs at the time at 8:01 where the air
> conditioner turn on at 8 o'clock.
>   ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
>   loops, 
> TAIPEI TWN IWEC DATA WMO#=466960, 08/22 08:01
>    ** Warning ** SimHVAC: Exceeding max iterations continues...   50
> 
> Thank you very much.
> 
> Chunming
> 
> 
> Michael J. Witte wrote:
> 
> > This means that something in the HVAC simulation is not converging
> > within the allowed number of iterations.  If this occurs only once
> > or twice, it could be a morning startup issue and can probably be
> > ignored.  If it occurs many times, it indicates a problem with your
> > system description.
> >
> > Mike
> >
> >
> > On 4 Dec 2002, at 17:19, Cristina Castaño/LABEIN wrote:
> >
> > > Hi,
> > >
> > > What is the meaning of the following error?, What is wrong?:
> > >
> > > ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> > > loops, SANTANDER ESP IWEC DATA WMO#=080230, 01/01 01:15
> > >
> > >
> > > Best regards,
> > > Cristina
> > >
> > >
> > >
> > >
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