2021 02 24_meeting - lbl-srg/soep GitHub Wiki

Date: February 24, 2021, 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

Release about a couple of weeks past the E+ release to allow for testing and final documentations. Amir fine with move the Spawn release past the E+ date.

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

Next, work on

• Spawn FMUs are not yet self contained, https://github.com/lbl-srg/modelica-buildings/issues/2054

• [For FY21, Q2] 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)

• [For FY21, Q2] Kyle to look into numerical instability (walls may be initialized to wrong temperature). See for example Experimental/EnergyPlus/Examples/VAVReheatRefBldgSmallOffice/FloorOpenLoop. The temperature in the attic should not raise in the first hour. (Pending since Nov. 2019)
• Add I/O variables for surfaces, https://github.com/lbl-srg/modelica-buildings/issues/2322
• Simulation hangs if simulated past 363 days, https://github.com/lbl-srg/modelica-buildings/issues/2314
• Remove warnings issued by EnergyPlus, https://github.com/lbl-srg/modelica-buildings/issues/2220
• Support negative start time in EnergyPlus, https://github.com/lbl-srg/modelica-buildings/issues/1938

LBL AOP 9/30 (go/no-go): Release that can couple Modelica-based control to E+. OK to release in early 2021.

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.

Stuart to analyze why some discrete variables seem to be not correctly initialized.

Hubertus to check/update status.

No discussion.

None.

Kyle to share binaries for the surface coupling testing (Linux only for now, outside of the regular CI testing).

None.