2020 09 09_meeting - lbl-srg/soep GitHub Wiki

Date: Sep. 9, 2020, 8:15am-9am Pacific Times

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

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

See milestones. Suggest for Linux 64 and Windows 64 (if tests on Windows 64 don't show new issues).

Branch issue1129_energyPlus_zone works for multiple buildings for JModelica, Dymola and OpenModelica.

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

Next, work on

• Kyle to work on support of QRad_flow, https://github.com/lbl-srg/modelica-buildings/issues/1954
• [Done] Michael to add validation for schedules and EMS actuators, https://github.com/lbl-srg/modelica-buildings/issues/1633
  • [Done] Kyle to fix blocker: https://github.com/lbl-srg/modelica-buildings/issues/2002
  • [For FY21] Kyle to fix schedule: https://github.com/lbl-srg/modelica-buildings/issues/2000 (Kyle either fixes it, or proposes new wording for https://lbl-srg.github.io/soep/softwareArchitecture.html#sending-input-to-energyplus)
• [Done] Kyle to provide description for user guide for how warmup works. (Email from May 5, 2020).
• [Done] Kyle to add filter level of info/error/fatal errors. See code near const size_t nCat = fmi2_import_get_log_categories_num(bui->fmu); (Pending since October 2019)
• [For FY21] 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. (Pending since Nov. 2019)
• Kyle to provide list of supported output variables, and statement of how non-supported output variables are handled, https://github.com/NREL/Spawn/commit/e443d634ab4f15d5d69e487fcc206c7d4f403353
• Michael/Milica to use thermal zones in larger model, https://github.com/lbl-srg/modelica-buildings/pull/1663
• Kyle to move model.spawn to resources folder. It has the same information as ModelicaBuildingsEnergyPlus.json (other than that some path are absolute and some are relative in model.spawn).
• [Done] Kyle to look into generating all outputs in the folder tmp-simulation-TwoIdenticalZones. Also avoid multiple copies, for example, tmp-simulation-OneZone.building has most files twice, including the binaries (total 183 MB).

LBL AOP 6/30: Couple controls I/O. (Ready.)

LBL AOP 9/30 (go/no-go): Release that can couple Modelica-based control to E+. (Linux is ready to be merged to master.)

Kyle to work on emitting all EnergyPlus objects that are supported by Spawn.

1. If there is a thermal zone in Modelica, then there need to be a Zone object in the idf file. Otherwise the simulation stops with an error. EnergyPlus reports a Fatal Error to its error file and to the FMI API call.
2. If there is an Zone object in the idf file but no thermal zone in Modelica for this EnergyPlus zone, then EnergyPlus simulates the zone using free floating temperature. There is no HVAC system, but may be internal gains. EnergyPlus reports an information message to its error file and to the FMI API call.
3. All HVAC objects in the idf file will be removed by the Spawn executable before it writes the idf file to the FMU.
4. For the EnergyPlus envelope, either the CTF transfer function or the finite difference method can be used.
5. Output variables and EMS actuators need not be present in the idf file.

Specfication at https://lbl-srg.github.io/soep/softwareArchitecture.html#coupling-of-a-zone-surface.

To be done in FY 21.

Stuart works on estimate for how much function calls are reduced if there is no numerical noise from derivative approximation.

OS X to be done in FY 21.

Windows works on Modelica side up to the point where the, at this point missing, binaries are called. Kyle posted binaries this morning.

No discussions.

No discussions.

To do:

• Address TypeError issues reported in https://github.com/lbl-srg/modelica-json/issues/106.
• Handling replaceable models.

None.

Kyle to prioritize implementation of QRad_flow, https://github.com/lbl-srg/modelica-buildings/issues/1954 and Windows testing.

Michael to work on Windows testing.

Michael to add issue about "numerical instability" above.

Michael to keep working with Modelon on making dp of pressure drop elements a state rather than p using stateSelect.