"
I am a new user of EnergyPlus, and I am trying to use FCU template by learning from the example: HVACTemplate-5ZoneFanCoil.
I copied the HVACTemplate:Zone:FanCoil objects together with Boiler, Chiller template objects to my model. I set the cooling temperature 12.2C and I got warning msg during plant sizing period as below:
"
What happened if you do not change the cooling temperature to 12.2°C? Which cooling temperature is this? Zone, system, plant, sizing, chiller?Post your IDF or choose a simpler example without the plant loops, as most the error messages are related to the plant loop.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: xs.zhang.2010@xxxxxxxxx
Date: Sat, 5 Mar 2011 19:33:53 -0800
Subject: [EnergyPlus_Support] Warning: HVAC Maximum Interation exceeded for all HVAC loops
Hi All
I am running my model by using AHU (AirLoopHVAC, with heating and cooling coil, OA box and a VFD fan) and Uncontrolled ATU. I use SetpointManager:Scheduled to specify heating and cooling supply air temperature based on time (very rough control). All plant loops and system loops are autosized.I am receiving warning msg below:
How should fix this for my HVAC simulations?
** Warning ** SimHVAC: Maximum iterations (20) exceeded for all HVAC loops, at PT, 01/09 13:00 - 13:30
** ~~~ ** SimFlags=[TTTFFFFF] AirLoops[T],ZoneEq[T],NonZoneEq[T],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 side outlet node=[330 - MIXER B:ZONE4 OUT NODE]
** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=0.000, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
** ~~~ ** HVAC side outlet node=[329 - MIXER B:ZONE1 OUT NODE]
** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=0.000, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
** ~~~ ** HVAC side outlet node=[328 - MIXER 7F:ZONE4 OUT NODE]
** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=0.000, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
** ~~~ ** HVAC side outlet node=[327 - MIXER 7F:ZONE2 OUT NODE]
** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=0.000, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
** ~~~ ** HVAC side outlet node=[326 - MIXER 6F:ZONE4 OUT NODE]
** ~~~ ** 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 EnthalpyTol=0.000, MassFlowTol=0.000, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
** ~~~ ** Plant side outlet node=[177 - CHILLED WATER LOOP CNDW DEMAND OUTLET]
** ~~~ ** Plant EnthalpyTol=0.000, MassFlowTol=0.000, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
** ~~~ ** Plant side outlet node=[172 - CHILLED WATER LOOP CNDW DEMAND INLET]
** ~~~ ** Plant EnthalpyTol=0.000, MassFlowTol=0.000, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=0.00, EnergyTol=-15921995.331, TempTol=20.15
** ~~~ ** Plant side outlet node=[165 - CHILLED WATER LOOP CHW DEMAND OUTLET]
** ~~~ ** Plant EnthalpyTol=0.000, MassFlowTol=0.000, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
** ~~~ ** Plant side outlet node=[146 - HOT WATER LOOP HW DEMAND OUTLET]
** ~~~ ** Plant EnthalpyTol=0.000, MassFlowTol=189.003, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=189.00, EnergyTol=5704038.440, TempTol=0.00
** ~~~ ** Plant side outlet node=[160 - CHILLED WATER LOOP CHW DEMAND INLET]
** ~~~ ** Plant Flow Tolerance Values, Most Recent listed first
** ~~~ ** PlantFlowFlowTol=0.000
** ~~~ ** PlantFlowFlowTol=0.000
** ~~~ ** PlantFlowFlowTol=0.000
** ~~~ ** PlantFlowFlowTol=189.003
** ~~~ ** PlantFlowFlowTol=0.000
** ~~~ ** SimFlags=[TTTFFFFF] AirLoops[T],ZoneEq[T],NonZoneEq[T],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 side outlet node=[330 - MIXER B:ZONE4 OUT NODE]
** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=0.000, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
** ~~~ ** HVAC side outlet node=[329 - MIXER B:ZONE1 OUT NODE]
** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=0.000, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
** ~~~ ** HVAC side outlet node=[328 - MIXER 7F:ZONE4 OUT NODE]
** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=0.000, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
** ~~~ ** HVAC side outlet node=[327 - MIXER 7F:ZONE2 OUT NODE]
** ~~~ ** HVAC EnthalpyTol=0.000, MassFlowTol=0.000, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
** ~~~ ** HVAC side outlet node=[326 - MIXER 6F:ZONE4 OUT NODE]
** ~~~ ** 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 EnthalpyTol=0.000, MassFlowTol=0.000, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
** ~~~ ** Plant side outlet node=[177 - CHILLED WATER LOOP CNDW DEMAND OUTLET]
** ~~~ ** Plant EnthalpyTol=0.000, MassFlowTol=0.000, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
** ~~~ ** Plant side outlet node=[172 - CHILLED WATER LOOP CNDW DEMAND INLET]
** ~~~ ** Plant EnthalpyTol=0.000, MassFlowTol=0.000, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=0.00, EnergyTol=-15921995.331, TempTol=20.15
** ~~~ ** Plant side outlet node=[165 - CHILLED WATER LOOP CHW DEMAND OUTLET]
** ~~~ ** Plant EnthalpyTol=0.000, MassFlowTol=0.000, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=0.00, EnergyTol=0.000, TempTol=0.00
** ~~~ ** Plant side outlet node=[146 - HOT WATER LOOP HW DEMAND OUTLET]
** ~~~ ** Plant EnthalpyTol=0.000, MassFlowTol=189.003, HumRatTol=0.0000, PressureTol=0
** ~~~ ** FlowQualTol=189.00, EnergyTol=5704038.440, TempTol=0.00
** ~~~ ** Plant side outlet node=[160 - CHILLED WATER LOOP CHW DEMAND INLET]
** ~~~ ** Plant Flow Tolerance Values, Most Recent listed first
** ~~~ ** PlantFlowFlowTol=0.000
** ~~~ ** PlantFlowFlowTol=0.000
** ~~~ ** PlantFlowFlowTol=0.000
** ~~~ ** PlantFlowFlowTol=189.003
** ~~~ ** PlantFlowFlowTol=0.000
Thanks for your answer.
Have a wonderful weekend.
Zhang
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