Re: [EnergyPlus_Support] Warning-CORRECTION

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

My apologies.  I was wrong about the bug in v1.0.2.  The bug only 
affected runs with multiple furnace or unitary systems with dx coils. 
 The window AC model was not affected.

One other thing to check with max iteration problems is the dx coil 
cooling convergence tolerance.

Mike


On 5 Dec 2002, at 9:27, Michael J. Witte wrote:

> 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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