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



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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