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Re: [EnergyPlus_Support] Re: Warnings
For the first 3 warnings, use the reference conditions in the chiller
object. Use these values (5C and 32C) and multiply out the equation in
the engineering reference using the coefficients a through f.in the
curve object (Chiller 2 CentEIRFT)
Engineering Reference equation:
ChillerEIRFTemp = a + b(Tcw,l) + c(Tcw,l)^2 + d(Tcond,e) + e(Tcond,e)^2
+ f(Tcs,l)(Tcond,e)
Equation using the reference conditions:
ChillerEIRFTemp = a + b(5C) + c(5C)^2 + d(32C) + e(32C)^2 + f(5C)(32C)
ChillerEIRFTemp = 1.136 (value in the error message)
Chiller:Electric:EIR,
Chiller2, !- Name
2110200, !- Reference Capacity {W}
5.0, !- Reference COP {W/W}
5, !- Reference Leaving Chilled Water Temperature {C}
32, !- Reference Entering Condenser Fluid Temperature {C}
autosize, !- Reference Chilled Water Flow Rate {m3/s}
autosize, !- Reference Condenser Water Flow Rate {m3/s}
Chiller2 CentCapFT, !- Cooling Capacity Function of Temperature Curve Name
Chiller2 CentEIRFT, !- Electric Input to Cooling Output Ratio Function
of Temperature Curve Name
Chiller2 CentEIRFPLR, !- Electric Input to Cooling Output Ratio Function
of Part Load Ratio Curve Name
0, !- Minimum Part Load Ratio
1, !- Maximum Part Load Ratio
1, !- Optimum Part Load Ratio
0.25, !- Minimum Unloading Ratio
For the remaining warnings (SimHVAC: Maximum iterations) there is
something causing the simulation to calculate different results while
trying to converge on an answer. Try using "autosize" for the Reference
Capacity as a starting point. If that doesn't work, try setting the
minimum unloading ratio to 0. If these changes do not work, I would
suggest checking the controls on the chiller to make sure the outlet
water temperature is meeting the set point temperature.
eplusven wrote:
>
> Thanks you Richard. This was actually generated by the template, could
> you please help me to identify what kind of design conditinos you are
> referring for a chiller that effects these curves.
>
> Thanks
> -Ven
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com>, Richard Raustad
> <RRaustad@...> wrote:
> >
> > Check the performance curve for the Energy input ratio as a function of
> > temperature curve for the chillers. At the design conditions, the
> output
> > of this curve should be very near 1. It's not off by much, but the
> > coefficients need a slight adjustment.
> >
> > eplusven wrote:
> > >
> > > Hi All,
> > >
> > > I am getting the following warnigns and they are happening
> repeatedly.
> > > Please help, how can I fix these
> > >
> > > Thanks
> > > -ven
> > >
> > > Program Version,EnergyPlus 4.0.0.024, 5/5/2010 6:24 PM,IDD_Version
> > > 4.0.0.024
> > > ************* Beginning Zone Sizing Calculations
> > > ** Warning ** Energy input ratio as a function of temperature curve
> > > output is not equal to 1.0
> > > ** ~~~ ** (+ or - 10%) at reference conditions for
> > > Chiller:Electric:EIR= CHILLER2
> > > ** ~~~ ** Curve output at reference conditions = 1.136
> > > ** Warning ** Energy input ratio as a function of temperature curve
> > > output is not equal to 1.0
> > > ** ~~~ ** (+ or - 10%) at reference conditions for
> > > Chiller:Electric:EIR= CHILLER3
> > > ** ~~~ ** Curve output at reference conditions = 1.136
> > > ** Warning ** Energy input ratio as a function of temperature curve
> > > output is not equal to 1.0
> > > ** ~~~ ** (+ or - 10%) at reference conditions for
> > > Chiller:Electric:EIR= CHILLER1
> > > ** ~~~ ** Curve output at reference conditions = 1.136
> > > ************* Beginning System Sizing Calculations
> > > ************* Beginning Plant Sizing Calculations
> > > ** Warning ** In calculating the design coil UA for
> Coil:Cooling:Water
> > > AHU COOLING COIL
> > > ** ~~~ ** no apparatus dew-point can be found for the initial
> entering
> > > and leaving conditions;
> > > ** ~~~ ** the coil bypass factor is unrealistically large;
> > > ** ~~~ ** the coil outlet design conditions will be changed to
> correct
> > > the problem.
> > > ** ~~~ ** The initial design conditions are: Tair,in = 25.94
> > > ** ~~~ ** Wair,in = 8.7981E-003
> > > ** ~~~ ** Twater,in = 5.00
> > > ** ~~~ ** Tair,out = 24.00
> > > ** ~~~ ** Wair,out = 8.0000E-003
> > > ** ~~~ ** The revised design conditions are: Tair,out = 22.26
> > > ** ~~~ ** Wair,out = 8.6981E-003
> > > ************* Testing Individual Branch Integrity
> > > ************* All Branches passed integrity testing
> > > ************* Testing Individual Supply Air Path Integrity
> > > ************* All Supply Air Paths passed integrity testing
> > > ************* Testing Individual Return Air Path Integrity
> > > ************* All Return Air Paths passed integrity testing
> > > ************* No node connection errors were found.
> > > ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all HVAC
> > > loops, at NEXTDAYSIM, 04/01 18:00 - 18:15
> > > ** ~~~ ** 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=[1000011]
> > >
> Enthalpy[1],MassFlow[0],HumRat[0],Pressure[0],FlowQual[0],Energy[1],Temp[1]..0=ok,1=fail
> > > ** ~~~ ** HVAC Tolerance Values, Most Recent listed first
> > > ** ~~~ ** HVAC EnthalpyTol=1677.584, MassFlowTol=0.000,
> > > HumRatTol=8.5924E-008, PressureTol=0
> > > ** ~~~ ** FlowQualTol=0.00, EnergyTol=805987.293, TempTol=1.67
> > > ** ~~~ ** HVAC side outlet node=[425 - ZONE EQUIPMENT OUTLET NODE]
> > > ** ~~~ ** HVAC EnthalpyTol=1677.584, MassFlowTol=0.000,
> > > HumRatTol=8.5924E-008, PressureTol=0
> > > ** ~~~ ** FlowQualTol=0.00, EnergyTol=805987.293, TempTol=1.67
> > > ** ~~~ ** HVAC side outlet node=[1 - AHU SYS 1 OUTLET NODE]
> > > ** ~~~ ** HVAC EnthalpyTol=1681.996, MassFlowTol=0.000,
> > > HumRatTol=8.6150E-008, PressureTol=0
> > > ** ~~~ ** FlowQualTol=0.00, EnergyTol=808106.990, TempTol=1.67
> > > ** ~~~ ** HVAC side outlet node=[425 - ZONE EQUIPMENT OUTLET NODE]
> > > ** ~~~ ** HVAC EnthalpyTol=1681.996, MassFlowTol=0.000,
> > > HumRatTol=8.6150E-008, PressureTol=0
> > > ** ~~~ ** FlowQualTol=0.00, EnergyTol=808106.990, TempTol=1.67
> > > ** ~~~ ** HVAC side outlet node=[1 - AHU SYS 1 OUTLET NODE]
> > > ** ~~~ ** HVAC EnthalpyTol=1686.419, MassFlowTol=0.000,
> > > HumRatTol=8.6376E-008, PressureTol=0
> > > ** ~~~ ** FlowQualTol=0.00, EnergyTol=810232.262, TempTol=1.67
> > > ** ~~~ ** HVAC side outlet node=[425 - ZONE EQUIPMENT OUTLET 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=[290 - CHILLER1 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=[262 - HWLFORFANCOILS HW 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=[285 - CHILLER1 CHW DEMAND INLET]
> > > ** ~~~ ** 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=[257 - HWLFORFANCOILS HW DEMAND
> INLET]
> > > ** ~~~ ** 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=[290 - CHILLER1 CHW DEMAND OUTLET]
> > > ** ~~~ ** Plant Flow Tolerance Values, Most Recent listed first
> > > ** ~~~ ** PlantFlowFlowTol=0.000
> > > ** ~~~ ** PlantFlowFlowTol=0.000
> > > ** ~~~ ** PlantFlowFlowTol=203.720
> > > ** ~~~ ** PlantFlowFlowTol=0.000
> > > ** ~~~ ** PlantFlowFlowTol=0.000
> > > ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all HVAC
> > > loops, at NEXTDAYSIM, 04/01 18:00 - 18:01
> > > ** ~~~ ** 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=[1000011]
> > >
> Enthalpy[1],MassFlow[0],HumRat[0],Pressure[0],FlowQual[0],Energy[1],Temp[1]..0=ok,1=fail
> > > ** ~~~ ** HVAC Tolerance Values, Most Recent listed first
> > > ** ~~~ ** HVAC EnthalpyTol=1664.041, MassFlowTol=0.000,
> > > HumRatTol=6.2533E-008, PressureTol=0
> > > ** ~~~ ** FlowQualTol=0.00, EnergyTol=799499.376, TempTol=1.65
> > > ** ~~~ ** HVAC side outlet node=[425 - ZONE EQUIPMENT OUTLET NODE]
> > > ** ~~~ ** HVAC EnthalpyTol=1664.041, MassFlowTol=0.000,
> > > HumRatTol=6.2533E-008, PressureTol=0
> > > ** ~~~ ** FlowQualTol=0.00, EnergyTol=799499.376, TempTol=1.65
> > > ** ~~~ ** HVAC side outlet node=[1 - AHU SYS 1 OUTLET NODE]
> > > ** ~~~ ** HVAC EnthalpyTol=1668.417, MassFlowTol=0.000,
> > > HumRatTol=6.2698E-008, PressureTol=0
> > > ** ~~~ ** FlowQualTol=0.00, EnergyTol=801601.941, TempTol=1.66
> > > ** ~~~ ** HVAC side outlet node=[425 - ZONE EQUIPMENT OUTLET NODE]
> > > ** ~~~ ** HVAC EnthalpyTol=1668.417, MassFlowTol=0.000,
> > > HumRatTol=6.2698E-008, PressureTol=0
> > > ** ~~~ ** FlowQualTol=0.00, EnergyTol=801601.941, TempTol=1.66
> > > ** ~~~ ** HVAC side outlet node=[1 - AHU SYS 1 OUTLET NODE]
> > > ** ~~~ ** HVAC EnthalpyTol=1672.805, MassFlowTol=0.000,
> > > HumRatTol=6.2862E-008, PressureTol=0
> > > ** ~~~ ** FlowQualTol=0.00, EnergyTol=803710.036, TempTol=1.66
> > > ** ~~~ ** HVAC side outlet node=[425 - ZONE EQUIPMENT OUTLET 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=[290 - CHILLER1 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=[262 - HWLFORFANCOILS HW 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=[285 - CHILLER1 CHW DEMAND INLET]
> > > ** ~~~ ** 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=[257 - HWLFORFANCOILS HW DEMAND
> INLET]
> > > ** ~~~ ** 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=[290 - CHILLER1 CHW DEMAND OUTLET]
> > > ** ~~~ ** Plant Flow Tolerance Values, Most Recent listed first
> > > ** ~~~ ** PlantFlowFlowTol=0.000
> > > ** ~~~ ** PlantFlowFlowTol=0.000
> > > ** ~~~ ** PlantFlowFlowTol=0.000
> > > ** ~~~ ** PlantFlowFlowTol=0.000
> > > ** ~~~ ** PlantFlowFlowTol=203.720
> > > ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all HVAC
> > > loops, at NEXTDAYSIM, 04/01 18:01 - 18:02
> > > ** ~~~ ** 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=[1000011]
> > >
> Enthalpy[1],MassFlow[0],HumRat[0],Pressure[0],FlowQual[0],Energy[1],Temp[1]..0=ok,1=fail
> > > ** ~~~ ** HVAC Tolerance Values, Most Recent listed first
> > > ** ~~~ ** HVAC EnthalpyTol=1663.649, MassFlowTol=0.000,
> > > HumRatTol=4.5510E-008, PressureTol=0
> > > ** ~~~ ** FlowQualTol=0.00, EnergyTol=799325.284, TempTol=1.65
> > > ** ~~~ ** HVAC side outlet node=[425 - ZONE EQUIPMENT OUTLET NODE]
> > > ** ~~~ ** HVAC EnthalpyTol=1663.649, MassFlowTol=0.000,
> > > HumRatTol=4.5510E-008, PressureTol=0
> > > ** ~~~ ** FlowQualTol=0.00, EnergyTol=799325.284, TempTol=1.65
> > > ** ~~~ ** HVAC side outlet node=[1 - AHU SYS 1 OUTLET NODE]
> > > ** ~~~ ** HVAC EnthalpyTol=1668.024, MassFlowTol=0.000,
> > > HumRatTol=4.5630E-008, PressureTol=0
> > > ** ~~~ ** FlowQualTol=0.00, EnergyTol=801427.341, TempTol=1.66
> > > ** ~~~ ** HVAC side outlet node=[425 - ZONE EQUIPMENT OUTLET NODE]
> > > ** ~~~ ** HVAC EnthalpyTol=1668.024, MassFlowTol=0.000,
> > > HumRatTol=4.5630E-008, PressureTol=0
> > > ** ~~~ ** FlowQualTol=0.00, EnergyTol=801427.341, TempTol=1.66
> > > ** ~~~ ** HVAC side outlet node=[1 - AHU SYS 1 OUTLET NODE]
> > > ** ~~~ ** HVAC EnthalpyTol=1672.410, MassFlowTol=0.000,
> > > HumRatTol=4.5750E-008, PressureTol=0
> > > ** ~~~ ** FlowQualTol=0.00, EnergyTol=803534.926, TempTol=1.66
> > > ** ~~~ ** HVAC side outlet node=[425 - ZONE EQUIPMENT OUTLET 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=[290 - CHILLER1 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=[262 - HWLFORFANCOILS HW 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=[285 - CHILLER1 CHW DEMAND INLET]
> > > ** ~~~ ** 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=[257 - HWLFORFANCOILS HW DEMAND
> INLET]
> > > ** ~~~ ** 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=[290 - CHILLER1 CHW DEMAND OUTLET]
> > > ** ~~~ ** Plant Flow Tolerance Values, Most Recent listed first
> > > ** ~~~ ** PlantFlowFlowTol=0.000
> > > ** ~~~ ** PlantFlowFlowTol=203.720
> > > ** ~~~ ** PlantFlowFlowTol=0.000
> > > ** ~~~ ** PlantFlowFlowTol=0.000
> > > ** ~~~ ** PlantFlowFlowTol=0.000
> > >
> > >
> >
> > --
> > Richard A. Raustad
> > Senior Research Engineer
> > Florida Solar Energy Center
> > University of Central Florida
> > 1679 Clearlake Road
> > Cocoa, FL 32922-5703
> > Phone: (321) 638-1454
> > Fax: (321) 638-1439 or 1010
> > Visit our web site at: http://www.fsec.ucf.edu <http://www.fsec.ucf.edu>
> >
> > UCF - From Promise to Prominence: Celebrating 40 Years
> >
>
>
--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL 32922-5703
Phone: (321) 638-1454
Fax: (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu
UCF - From Promise to Prominence: Celebrating 40 Years
------------------------------------
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