[EnergyPlus_Support] Warning: Heat Balance is out of balance

["anarui.oliveira" <anarui.oliveira@xxxxxxxxx>]

Hi.

Could anyone suggest me where to start looking to fix the warnings 
reproduced below, which I suppose are related (it is showing up for 
all zones in the model, controlled or otherwise)? Based on the Extra 
Warnings, it seems to be comimg from the air loops, but I'm not sure 
and, anyway, I can't figure out to do about it.

Despite the warnings, E+ runs the simulation and the zone 
temperatures seem pretty reasonable... how should I interpret the 
effect of these warnings on the results?

** Warning ** Zone Air Heat Balance is out of balance for zone named 
47833
   **   ~~~   ** Zone Air Heat Balance Deviation Rate is more than 
1241.7 (Watts)
   **   ~~~   **  Occurance info: Occurrence info=Leiria PRT INETI 
data WMO#=085360, 01/01 00:00 - 00:01


 ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all HVAC 
loops, at Leiria PRT INETI data WMO#=085360, 01/01 07:30 - 07:45
   **   ~~~   ** SimFlags=[TFFFFFFF] AirLoops[T],ZoneEq[F],NonZoneEq
[F],PlantLoops[F],CondLoops[F],ElecCircuits[F],PlantDemandLoops
[F],CondDemandLoops[F]..F=ok,T=fail
   **   ~~~   ** HVAC Tolerance Flags=[0000000] Enthalpy[0],MassFlow
[0],HumRat[0],Pressure[0],FlowQual[0],Energy[0],Temp[0]..0=ok,1=fail
   **   ~~~   ** HVAC Tolerance Values, Most Recent listed first
   **   ~~~   ** HVAC EnthalpyTol=0.000, MassFlowTol=0.000, 
HumRatTol=0.0000, PressureTol=0
   **   ~~~   **      FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
   **   ~~~   ** HVAC EnthalpyTol=0.000, MassFlowTol=0.310, 
HumRatTol=0.0000, PressureTol=0
   **   ~~~   **      FlowQualTol=0.31, EnergyTol=9648.657, 
TempTol=0.00
   **   ~~~   ** HVAC EnthalpyTol=0.000, MassFlowTol=0.000, 
HumRatTol=0.0000, PressureTol=0
   **   ~~~   **      FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
   **   ~~~   ** HVAC EnthalpyTol=0.000, MassFlowTol=0.310, 
HumRatTol=0.0000, PressureTol=0
   **   ~~~   **      FlowQualTol=0.31, EnergyTol=9648.657, 
TempTol=0.00
   **   ~~~   ** HVAC EnthalpyTol=0.000, MassFlowTol=0.000, 
HumRatTol=0.0000, PressureTol=0
   **   ~~~   **      FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
   **   ~~~   ** 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

Regards,
Ana Rui.


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