Hi there,
I'm trying to use EMS to create a new variable from several standard output options at the end of the simulation period. My new variable does not need to feed back into any simulation, or to cancel the run or modify it in any other complex way, as EMS allows you to do, it just needs to sum several Output: Meter values and Output: Variable values, then increase this figure by a percentage if the discomfort hours exceed a certain amount.
As I said, it only needs to do this at the very end of the simulation, as it's working with values for the total time of the simulation. This doesn't seem to be an option in EMS, so I am using "EndOfZoneTimestepBeforeZoneReporting" as the calling point.
My question is, for something so simple as this, is EMS the right thing to be using at all? The most simple example in the EMS guide literature (EMSCustomOutputVariable) is similarly just summing things, but it is doing it for each time step, rather than just at the end. If it isn't EMS then what should I use?
Relevent code below. At the moment the loop to check the comfort hours isn't in. At the moment it runs but I can't access the variable that I'm trying to produce. Can provide full idf file if needed. Thanks for your time.
EnergyManagementSystem:Sensor,
T1, !- Name
Block1:Zone1, !- Output:Variable or Output:Meter Index Key Name
Time Not Comfortable Summer or Winter Clothes; !- Output:Variable or Output:Meter Name
EnergyManagementSystem:Sensor,
T2, !- Name
*, !- Output:Variable or Output:Meter Index Key Name
Heating:DistrictHeating; !- Output:Variable or Output:Meter Name
EnergyManagementSystem:Sensor,
T3, !- Name
*, !- Output:Variable or Output:Meter Index Key Name
Cooling:DistrictCooling; !- Output:Variable or Output:Meter Name
EnergyManagementSystem:Sensor,
T4, !- Name
*, !- Output:Variable or Output:Meter Index Key Name
WaterSystems:DistrictHeating; !- Output:Variable or Output:Meter Name
EnergyManagementSystem:Sensor,
T5, !- Name
*, !- Output:Variable or Output:Meter Index Key Name
InteriorLights:Electricity; !- Output:Variable or Output:Meter Name
EnergyManagementSystem:Sensor,
T6, !- Name
*, !- Output:Variable or Output:Meter Index Key Name
InteriorEquipment:Electricity; !- Output:Variable or Output:Meter Name
!EnergyManagementSystem:Sensor,
! T7, !- Name
!*, !- Output:Variable or Output:Meter Index Key Name
!Fans:Electricity; !- Output:Variable or Output:Meter Name
EnergyManagementSystem:ProgramCallingManager,
CO2 incl penalty, !- Name
EndOfZoneTimestepBeforeZoneReporting, !- EnergyPlus Model Calling Point
CO2InclPenalty; !- Program Name 1
EnergyManagementSystem:GlobalVariable,
TotCO2InclPenalty; !- Erl Variable 1 Name
EnergyManagementSystem:OutputVariable,
Total CO2 emissions including penalty [kg], !- Name
TotCO2InclPenalty, !- EMS Variable Name !
Summed, !- Type of Data in Variable
SystemTimeStep; !- Update Frequency
! SumOrAverage, !- Type of Data in Variable
! ZoneTimeStep; !- Update Frequency
EnergyManagementSystem:Program,
CO2InclPenalty, !- Name
SET CO2gas = 0.19, ! Kg CO2 per what?
SET CO2elec = 0.43, !Kg CO2 per kWh
SET BoilEff = 0.9, ! efficiency of boiler
SET ChillEff = 3.5, ! efficiency of chiller
SET GasDemand = (T2+T4)/BoilEff, !total demand for gas
SET ElecChill = T3/ChillEff, ! electricity demand from chiller
SET OtherElec = T5+T6,
SET TotalElecDemand = OtherElec+ElecChill, ! total electricity demand
SET CO2ExclPenalty = (GasDemand*CO2gas) + (TotalElecDemand*CO2elec),
SET TotCO2InclPenalty = CO2ExclPenalty*1.2;
! So do the above as a dummy, then work out how to put the if/else loop in for overheating hours.
Output:EnergyManagementSystem,
Verbose, !- Actuator Availability Dictionary Reporting
Verbose, !- Internal Variable Availability Dictionary Reporting
Verbose; !- EMS Runtime Language Debug Output Level
--Jeremiah D. Crossett | Senior Analyst | Phase Change Energy Solutions120 E. Pritchard St. | Asheboro, NC 27203 | Mobile 503-688-8951
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