Whole building electric consumption from FMU

answered 2019-10-04 08:20:38 -0600

Thierry Nouidui
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All EnergyPlus Output:Variable can be exposed as Outputs of an EnergyPlus FMU. So if this variable exists as an EnergyPlus Output:Variable and you can report it when performing a regular EnergyPlus simulation (with no FMU in-the-loop), then there is no reason why you shouldn't be able to extract the value from the FMU.

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I had to manually add the variable in the idf because was not present. After that yes, it is possible to extract the value.

Giorgio ( 2019-10-04 08:24:34 -0600 )edit

Hi Giorgio, could you please tell me how did you figure it out? I mean, how exactly did you add the Output:Variable regarding the Energy consumption?

jdominguez94 ( 2021-06-23 08:09:10 -0600 )edit

Hi Thierry, I added the Air System Gas Energy and Facility Total HVAC Electric Demand Power in the Output:Variable. I confirmed that I could get these outputs after a regular EnergyPlus simulation (with no FMU in the loop). But I cannot extract these values using EnergyPlustoFMU tool.

solutionlx ( 2021-07-26 14:04:02 -0600 )edit

Did you add in the IDF an object of type ExternalInterface: FunctionalMockupUnitExport:From:Variable, which will expose that Output:Variable at the FMU outputs' ports so you can extract them?

Thierry Nouidui ( 2021-07-27 07:28:00 -0600 )edit

Yes, the variable is added through the object ExternalInterface: FunctionalMockupUnitExport:From:Variable. The error message is * Severe * ExternalInterface: Simulation model has no variable "FACILITY TOTAL HVAC ELECTRIC DEMAND POWER" with key "WHOLE BUILDING". I confirmed that the Whole Building:Facility Total HVAC Electric Demand Power W was output in the csv. file from the regular EnergyPlus simulation.

solutionlx ( 2021-07-27 12:38:07 -0600 )edit

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