Re: [EnergyPlus_Support] Unitary Systems Interaction

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

Max iteration warnings and one system appearing to impact another 
indicates some type of node connection error such as the same node 
name being used in both AHU1 and AHU2.  If you cannot find such an 
error, please send your idf file to energyplus-support@xxxxxxxx

Mike



On 11 Oct 2002, at 16:11, Doug Benton wrote:

> I have a 3 zone building.  I am trying to control humidity within a
> range.  I've am using a separate air primary loop for each zone.  Each
> primary loop has a furnace with DX cooling coil and reheat coil.  
> 
> When I run the entire model, I get the warning, 
> 
> ** Warning ** FURNACE:BLOWTHRU:HEATCOOL "AHU2 UNITARYSYSTEM" -- 
> Exceeded max cooling iterations while adjusting compressor runtime at
> MM/DD HH:MM.mm= 3/03 13:30.00, MaxIter=15
> 
> This warning repeats for AHU1, and it repeats hundreds of times for
> AHUs 1 & 2.
> 
> AHU3 cooling coil is schedule off, so it does not have the same 
> warning.
> 
> If I delete AHUs 1 & 3 and rerun, the warning goes away.
> 
> Is there a programming error that would allow separate primary loops,
> each with its own furnace and DX coil, to interact?  Would you like me
> to send a copy of the ".IDF" file?
> 
> 
> 
> 
> 
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