2019 11 20_meeting - lbl-srg/soep GitHub Wiki

SOEP Coordination meeting

Date: November 20, 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. Kyle: NREL/Modelon subcontract update.
  3. Michael: SimBuild paper.
  4. Kyle, Michael: Refactoring room air heat and mass balance.
  5. Kyle, Michael: EnergyPlus I/O variables.
  6. Stuart: FMI-QSS.
  7. Kyle, Michael: Optimica license protection.
  8. Jianjun: JSON representation for OS front-end to Modelica
  9. Other items

Participants

Kyle Benne
Yanfei Li
Jianjun Hu
Stuart Mentzer
Michael Wetter

Minutes

SimBuild paper

Paper is developed at https://bitbucket.org/berkeleylab/srg-soep-papers/src/master/, see https://bitbucket.org/berkeleylab/srg-soep-papers/src/master/2020-simbuild/1_manuscript/

Michael to review outline with Amir.

Michael to point Stuart to a model for QSS, a couple of event indicator would be fine. Maybe use BESTEST with thermostat?

NREL/Modelon subcontract

This is executed on both side.

Numerical investigations

No work conducted.

Refactoring room air balance

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

The specification on https://lbl-srg.github.io/soep/softwareArchitecture.html has been updated for schedules and EMS actuators.

Issues are at https://github.com/lbl-srg/modelica-buildings/issues?q=is%3Aissue+is%3Aopen+label%3Aspawn

Next, work on

  • Kyle to implement EnergyPlus output variables.
  • Michael to implement schedules and EMS actuators.
  • Kyle to implement schedules and EMS actuators.
  • 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

Stuart to work on updating 3rd order QSS with numerical differentiation.

Next will be work on performance estimation assuming we would have automatic differentiation.

Michael to set up simple control example with time sampling, PI and hysteresis. Put example to https://github.com/NREL/SOEP-QSS-Test

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

Michael to set up simple control example for QSS with time sampling, PI and hysteresis.

See next steps under "Refactoring room air balance".

Previous action items

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

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

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