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2021 03 10_meeting
Date: March 10, 2021, 8:15am-9am Pacific Times
The purpose of this meeting is to coordinate the Modelica integration for SOEP.
Join from PC, Mac, Linux, iOS or Android: https://lbnl.zoom.us/my/mwetter
Or iPhone one-tap (US Toll): +14086380968,6614042296# or +16465588656,6614042296#
- Or Telephone:
- Dial: +1 408 638 0968 (US Toll) or +1 646 558 8656 (US Toll) Meeting ID: 661 404 2296 International numbers available: https://lbnl.zoom.us/zoomconference?m=_h5BuJ686mPy3rWEyKf4NROxLaeOV5J8
- Previous action items.
- Modelica Conference paper
- Kyle, Michael: EnergyPlus-Modelica coupling.
- Kyle, Michael: EnergyPlus I/O variables.
- Michael, Kyle: Support for radiant systems.
- Stuart: FMI-QSS.
- Kyle, Michael: Optimica license protection.
- Jianjun: JSON representation for OS front-end to Modelica
- Other items
To be developed with Kyle and Baptiste as co-author.
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 Initialiation to 0 K should be fixed in tonights built.
- 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
Surface heat flux validation.
Test 1: Use 2 zones, separated by one surface. Set surface temperatures on both sides, and different room air temperatures. Difference in heat flux at surfaces must be the heat flux that goes through the wall at steady state.
Possible 2nd Test: Set the surface of an outside wall (room-side surface) and check heat conduction to outside. Maybe use steady-state heat conduction.
Tests to be implemented in EnergyPlus CI testing by Kyle.
LBL AOP 9/30 (go/no-go): Release that can couple Modelica-based control to E+. OK to release in early 2021.
- 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.
- 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.
- All HVAC objects in the idf file will be removed by the Spawn executable before it writes the idf file to the FMU.
- For the EnergyPlus envelope, either the CTF transfer function or the finite difference method can be used.
- 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.
Separate call planned for next week.
Hubertus to check/update status.
No discussion.
None.
Kyle to add validation of setting surfaces in EnergyPlus.
Michael to test the new binary for setting the surface temperature.
Done. Kyle to share binaries for the surface coupling testing (Linux only for now, outside of the regular CI testing).