2019 10 23_meeting - lbl-srg/soep GitHub Wiki

SOEP Coordination meeting

Date: October 9, 2019, 8:15am-9am Pacific Times

The purpose of this meeting is to coordinate the Modelica integration for SOEP.

Meeting information

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Agenda

  1. Previous action items.
  2. SimBuild paper.
  3. Kyle, Michael: Refactoring room air heat and mass balance.
  4. Kyle, Michael: EnergyPlus I/O variables.
  5. Stuart: FMI-QSS.
  6. Kyle, Michael: Optimica license protection.
  7. Jianjun: JSON representation for OS front-end to Modelica
  8. Other items

Participants

Kyle Benne
Yanfei Li
Jianjun Hu
Stuart Mentzer
Bo Shen
Hubertus Tummescheit
Michael Wetter

Minutes

Numerical investigations

No work conducted.

Refactoring room air balance

Branch issue1129_energyPlus_zone now works for multiple buildings for JModelica, Dymola and OpenModelica. This has the FMI interface now.

Branch issue1129_energyPlus_zone has new architecture with top level building instance.

Next, work on

  • Yanfei to clean up idf file for 2 identical rooms to avoid EnergyPlus errors.

  • Kyle to implement EnergyPlus output variables. * Do we need all of them:

    • Output:Variable (implemented)
    • EnergyManagementSystem:OutputVariable. These are all also Output:Variable.
      There is no need to support them in Spawn.
    • EnergyManagementSystem:Sensor. These are all also Output:Variable.
      There is no need to support them in Spawn.

  • Michael to specify what variables to write to in EnergyPlus. * Do we need all of them:

    • EMS variable. Ignore for now as this would only allow to mix Modelica and ERL.
    • EMS actuator. Support for Spawn. All EMS actuators are for now available to fmi. Will be required to be defined only in .json file.
    • Schedule. Support for Spawn.

  • Kyle to make an FMU that does not compress the files.

  • Kyle to look into generating all outputs in the folder tmp-simulation-TwoIdenticalZones

  • Kyle to look into numerical instability (walls may be initialized to wrong temperature). See for example Experimental/EnergyPlus/Examples/VAVReheatRefBldgSmallOffice/FloorOpenLoop or Experimental/EnergyPlus/Validation/OneZone and set the initial room temperature to 10 degC.

  • Michael and Kyle to work out how to filter level of info/error/fatal errors. See code near

const size_t nCat = fmi2_import_get_log_categories_num(bui->fmu); * Installer package for all three platforms.

Contract:

  1. All zones in the idf file must have a zone model in Modelica. Otherwise the simulation stops with an error.
  2. If there is an HVAC system in the idf file, then EnergyPlus issues a warning, the EnergyPlus HVAC system is not simulated, but the coupled EnergyPlus/Modelica simulation proceeds.
  3. For the EnergyPlus envelope, either the CTF transfer function or the finite difference method can be used.

FMI-QSS

No discussions.

Stuart works on using the directional derivatives, has it working now in OCT. Updated QSS code to use directional derivatives. Now works on parallelization.

Stuart works with Agnes as reverse dependencies seem missing in the modelDescription.xml file.

CI testing (funnel)

No discussions.

Next:

  • Work on experiment specification.

Optimica license protection

No discussion.

Subcontract between Modelon and NREL still not in place. Hubertus will have a call with Luigi.

Potential paths: Check diff to frozen library. Allow n models to be changed. Upgrade path to full OCT version (with access to cloud version in an integrated way).

Need to define the different use cases and work flows.

Use of python API makes protection much easier, is sufficient unless interactive mode is needed. Java API would be needed for interactive mode.

JSON representation for OS front-end to Modelica

No discussion.

Jianjun to work on modelica-json parsing in Modelica rather than CDL mode.

Ongoing is dealing with replaceable models.

Other items

None.

New action items

None, but see next steps under "Refactoring room air balance".

Previous action items

Jianjun will change nle_solver_tol_factor to 1E-2 instead of 1E-4 in regression testing.

Michael will look into making dp of pressure drop elements a state rather than p using stateSelect.

Michael to add to next Modelon subcontract fall back to avoid tearing.

Agnes to get back regarding debug information for user for nonlinear solver.

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