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Re: [EnergyPlus_Support] Maximum iterations exceeded for all HVAC loops

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Maximum iterations exceeded for all HVAC loops
From: "Michael J. Witte" <mjwitte@xxxxxxxx>
Date: Wed, 12 Feb 2003 15:14:56 -0600
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Some further advice on checking node connections:

In the *.bnd output file, there is a list of all node names used in 
your input file.  After each node name is a count of how many times 
it was referenced after it was created.  Nodes with a zero reference 
count as suspect and may indicate an error.  Exceptions where a zero 
is expected are:  zone air nodes and condenser inlet nodes for an air 
cooled chiller.  There may be other exceptions which I have not 
thought of.

Mike



On 12 Feb 2003, at 10:39, Michael J. Witte wrote:

> James:
> 
> This usually indicates a bad configuration that is impossible to
> solve.  It is probably an incorrect node name somewhere in your
> system.  Many node connections are checked for validity, but many are
> not.  Review your node names to make sure that a complete loop is
> defined and there are no dangling nodes.  Also check for controllers
> that may be operating without a valid setpoint node.
> 
> Mike
> 
> 
> On 12 Feb 2003, at 11:55, James O'Donnell wrote:
> 
> > Dear All,
> >        Could anybody please explain or offer possibe reasons to why
> >        my
> > simple model consisting of a fan a heating coil and a cooling coil
> > would produce the following warnings?
> > 
> > 
> > ************* Testing Individual Branch Integrity
> >    ************* All Branches passed integrity testing
> >    ************* No node connection errors were found.
> >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> >    loops,
> > SUMMER DESIGN DAY, 07/21 00:10
> >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> >    loops,
> > SUMMER DESIGN DAY, 07/21 00:10
> >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> >    loops,
> > SUMMER DESIGN DAY, 07/21 00:10
> >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> >    loops,
> > SUMMER DESIGN DAY, 07/21 00:10
> >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> >    loops,
> > SUMMER DESIGN DAY, 07/21 00:10
> >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> >    loops,
> > SUMMER DESIGN DAY, 07/21 00:10
> >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> >    loops,
> > SUMMER DESIGN DAY, 07/21 01:10
> >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> >    loops,
> > SUMMER DESIGN DAY, 07/21 01:10
> >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> >    loops,
> > SUMMER DESIGN DAY, 07/21 01:10
> >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> >    loops,
> > SUMMER DESIGN DAY, 07/21 01:10
> >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> >    loops,
> > SUMMER DESIGN DAY, 07/21 01:10
> >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> >    loops,
> > SUMMER DESIGN DAY, 07/21 01:10
> >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> >    loops,
> > SUMMER DESIGN DAY, 07/21 02:10
> >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> >    loops,
> > SUMMER DESIGN DAY, 07/21 02:10
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...   50
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  100
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  150
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  200
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  250
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  300
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  350
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  400
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  450
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  500
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  550
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  600
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  650
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  700
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  750
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  800
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  850
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  900
> >    ** Warning ** SimHVAC: Exceeding max iterations continues...  950
> >    ** Warning ** SimHVAC: Exceeding max iterations continues... 1000
> >    ** Warning ** SimHVAC: Exceeding max iterations continues... 1050
> >    ** Warning ** SimHVAC: Exceeding max iterations continues... 1100
> >    ** Warning ** SimHVAC: Exceeding max iterations continues... 1150
> >    ** Warning ** SimHVAC: Exceeding max iterations continues... 1200
> >    ** Warning ** SimHVAC: Exceeding max iterations continues... 1250
> >    ** Warning ** SimHVAC: Exceeding max iterations continues... 1300
> >    ** Warning ** SimHVAC: Exceeding max iterations continues... 1350
> >    ** Warning ** SimHVAC: Exceeding max iterations continues... 1400
> >    ** Warning ** SimHVAC: Exceeding max iterations continues... 1450
> >    ** Warning ** SimHVAC: Exceeding max iterations continues... 1500
> >    ************* EnergyPlus Completed Successfully-- 44 Warning; 0
> >    Severe
> > Errors; Elapsed Time=00hr 00min 29sec
> > 
> > 
> >                                   Yours Thankfully:
> >                                   James
> > O'Donnell
> > 
> > 
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References:
- [EnergyPlus_Support] Maximum iterations exceeded for all HVAC loops
  - From: James O'Donnell
- Re: [EnergyPlus_Support] Maximum iterations exceeded for all HVAC loops
  - From: Michael J. Witte

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