Re: [EnergyPlus_Support] Max Iteration Error Decoding

[jeannieboef <jeannieboef@xxxxxxxxx>]

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@xxxxxxxxx> 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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