2019 08 14_meeting - lbl-srg/soep GitHub Wiki

SOEP Coordination meeting

Date: August 14, 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, Michael: Refactoring room air heat and mass balance.
  3. EnergyPlus I/O variables.
  4. Stuart: FMI-QSS.
  5. Kyle, Michael: Optimica license protection.
  6. Jianjun: JSON representation for OS front-end to Modelica
  7. Other items

Participants

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

Minutes

Refactoring room air balance

Branch issue1129_energyPlus_zone now works for one building for JModelica, Dymola and OpenModelica.

Branch issue1129_energyPlus_zone_fmiSignature works with one and multiple buildings exported from JModelica as an FMU.

Next, work on

  • Kyle to look into numerical instability (walls may be initialized to wrong temperature)
  • Michael to look into where segfault happens for jm_ipython.sh jmodelica.py Buildings.Experimental.EnergyPlus.Validation.ThreeZonesTwoBuildings It works for JModelica generated FMUs, but not for EnergyPlus. However, Kyle has a unit test that works for multiple EnergyPlus FMUs.
  • Kyle to add error handling and flag to clean temporary files.
  • Kyle to provide an idf file with 3 identical rooms.
  • Installer package for all three platforms.
  • Then implement control I/O.

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.

EnergyPlus I/O variables

No activity until room model is finished.

Modelon

Hubertus updates about new compilation.

FMI-QSS

Stuart works on using the directional derivatives, has it working now in OCT. Now updates QSS code to use directional derivatives, sees no significant performance hit.

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

CI testing (funnel)

No discussion.

Next:

  • Test using funnel as the default diff tool in BuildingsPy.
  • Use funnel for cross comparison between dymola and jmodelica.
  • Work on experiment specification.

Optimica license protection

Subcontract between Modelon and NREL still not in place. Hubertus asks how to speed up issuing the contract.

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.

Previous action items

None.

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