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[EnergyPlus_Support] Re: Max Iteration Error Decoding
Jeannie,
I have an extremely large internal mass set for the only zone in the simulation. The building is a warehouse so the product inside has an outsized impact on the model.
If the critical flows and temps are consistent across each timestep - should I ignore the errors? Would increasing the interation limit help?
Thanks
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, jeannieboef <jeannieboef@...> wrote:
>
> output temp and mass flow on all critical nodes to make sure they
> values make sence. If your output:variable dictionary is set to idf
> format, you can copy paste the output text direct from the rdd file
> and paste it into the idf.
>
> Do you have any very high internal mass constructions, high
> infiltration rates or sharp and big setpoint changes?
>
> Sent from my iPhone
>
> On 03.12.2012, at 22:48, "thevinyldropper" <thevinyldropper@...>
> wrote:
>
> > Can anyone tell me how to decode max iteration errors? My simulation
> > is well controlled and everything seems to be working properly, but
> > I cant fix the max iteration errors. Not sure if I should just
> > ignore them. Below are two of the errors.
> >
> > ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all HVAC
> > loops, at RUN PERIOD 1, 04/01 11:05 - 11:10
> > ** ~~~ ** SimFlags=[TFFFF] AirLoops[T],ZoneEq[F],NonZoneEq
> > [F],PlantLoops[F],ElecCircuits[F]..F=ok,T=fail
> > ** ~~~ ** HVAC Tolerance Flags=[0100010] Enthalpy[0],MassFlow
> > [1],HumRat[0],Pressure[0],FlowQual[0],Energy[1],Temp[0]..0=ok,1=fail
> > ** ~~~ ** HVAC Tolerance Values, Most Recent listed first
> > ** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=123.866,
> > HumRatTol=0.0000, PressureTol=0
> > ** ~~~ ** FlowQualTol=0.00, EnergyTol=2973190.894, TempTol=0.00
> > ** ~~~ ** HVAC side outlet node=[14 - NODE 6]
> > ** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=6.016E-002,
> > HumRatTol=0.0000, PressureTol=0
> > ** ~~~ ** FlowQualTol=0.00, EnergyTol=1479.110, TempTol=0.00
> > ** ~~~ ** HVAC side outlet node=[8 - NODE:FAN/AIRLOOP OUTLET]
> > ** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=123.866,
> > HumRatTol=0.0000, PressureTol=0
> > ** ~~~ ** FlowQualTol=0.00, EnergyTol=2973190.894, TempTol=0.00
> > ** ~~~ ** HVAC side outlet node=[14 - NODE 6]
> > ** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=6.016E-002,
> > HumRatTol=0.0000, PressureTol=0
> > ** ~~~ ** FlowQualTol=0.00, EnergyTol=1479.110, TempTol=0.00
> > ** ~~~ ** HVAC side outlet node=[8 - NODE:FAN/AIRLOOP OUTLET]
> > ** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=123.866,
> > HumRatTol=0.0000, PressureTol=0
> > ** ~~~ ** FlowQualTol=0.00, EnergyTol=2973190.894, TempTol=0.00
> > ** ~~~ ** HVAC side outlet node=[14 - NODE 6]
> > ** ~~~ ** Plant Tolerance Flags=[00000000] Enthalpy[0],MassFlow
> > [0],HumRat[0],Pressure[0],FlowQual[0],Energy[0],Temp
> > [0],PlantFlowMassFlow[0]..0=ok,1=fail
> > ** ~~~ ** Plant Tolerance Values, Most Recent listed first
> > ** ~~~ ** Plant Flow Tolerance Values, Most Recent listed first
> > ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all HVAC
> > loops, at RUN PERIOD 1, 04/01 11:10 - 11:15
> > ** ~~~ ** SimFlags=[TFFFF] AirLoops[T],ZoneEq[F],NonZoneEq
> > [F],PlantLoops[F],ElecCircuits[F]..F=ok,T=fail
> > ** ~~~ ** HVAC Tolerance Flags=[0100010] Enthalpy[0],MassFlow
> > [1],HumRat[0],Pressure[0],FlowQual[0],Energy[1],Temp[0]..0=ok,1=fail
> > ** ~~~ ** HVAC Tolerance Values, Most Recent listed first
> > ** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=123.866,
> > HumRatTol=0.0000, PressureTol=0
> > ** ~~~ ** FlowQualTol=0.00, EnergyTol=2916452.724, TempTol=0.00
> > ** ~~~ ** HVAC side outlet node=[14 - NODE 6]
> > ** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=6.016E-002,
> > HumRatTol=0.0000, PressureTol=0
> > ** ~~~ ** FlowQualTol=0.00, EnergyTol=1451.570, TempTol=0.00
> > ** ~~~ ** HVAC side outlet node=[8 - NODE:FAN/AIRLOOP OUTLET]
> > ** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=123.866,
> > HumRatTol=0.0000, PressureTol=0
> > ** ~~~ ** FlowQualTol=0.00, EnergyTol=2916452.724, TempTol=0.00
> > ** ~~~ ** HVAC side outlet node=[14 - NODE 6]
> > ** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=6.016E-002,
> > HumRatTol=0.0000, PressureTol=0
> > ** ~~~ ** FlowQualTol=0.00, EnergyTol=1451.570, TempTol=0.00
> > ** ~~~ ** HVAC side outlet node=[8 - NODE:FAN/AIRLOOP OUTLET]
> > ** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=123.866,
> > HumRatTol=0.0000, PressureTol=0
> > ** ~~~ ** FlowQualTol=0.00, EnergyTol=2916452.724, TempTol=0.00
> > ** ~~~ ** HVAC side outlet node=[14 - NODE 6]
> > ** ~~~ ** Plant Tolerance Flags=[00000000] Enthalpy[0],MassFlow
> > [0],HumRat[0],Pressure[0],FlowQual[0],Energy[0],Temp
> > [0],PlantFlowMassFlow[0]..0=ok,1=fail
> > ** ~~~ ** Plant Tolerance Values, Most Recent listed first
> > ** ~~~ ** Plant Flow Tolerance Values, Most Recent listed first
> >
> >
>
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