2020 03 25_meeting - lbl-srg/soep GitHub Wiki

Date: March 25, 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. Kyle, Michael: Refactoring room air heat and mass balance.
3. Kyle, Michael: EnergyPlus I/O variables.
4. Michael, Kyle: Support for radiant systems.
5. Stuart: FMI-QSS.
6. Kyle, Michael: Optimica license protection.
7. Jianjun: JSON representation for OS front-end to Modelica
8. Other items

This needs analysis of a Modelon staff who can look into the solver.

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 implement schedules and EMS actuators on EnergyPlus side (blocker), https://github.com/lbl-srg/modelica-buildings/issues/1818. Support now implemented, schedules and actuators have unit not defined, will be fixed in the future.
• Michael to add validation for schedules and EMS actuators, https://github.com/lbl-srg/modelica-buildings/issues/1633
• Kyle to correct delayed output variable, https://github.com/lbl-srg/modelica-buildings/issues/1679 Should be addressed in next built.
• Kyle to support unit declarations (blocker), https://github.com/lbl-srg/modelica-buildings/issues/1680
• Kyle to support reading zone air temperature, https://github.com/lbl-srg/modelica-buildings/issues/1681. Should be addressed in next built.
• Kyle to make EnergyPlus ignore RunPeriod (currently Spawn just hangs), https://github.com/lbl-srg/modelica-buildings/issues/1678. Should be addressed in next built.
• Michael/Milica to use thermal zones in larger model, https://github.com/lbl-srg/modelica-buildings/pull/1663
• Michael/Kun to implement example with single zone model, https://github.com/lbl-srg/modelica-buildings/issues/1582
• Kyle to trigger an error if condition 1 below is not satisfied (or we need to change the contract)
• Kyle to make an FMU that does not compress the files. Should be addressed in next built, by default no compression, but also has option not to zip it.
• Kyle to look into generating all outputs in the folder tmp-simulation-TwoIdenticalZones. Kyle will add a flag to be used to specify the output file directory.
• 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.
• Kyle and Michael 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); * Kyle to create installer package for all three platforms.

Kyle works on actuators and schedule support. Goal is to have a Buildings library release with Spawn before the peer-review.

Next binary of EnergyPlus will have idf file with unsupported objects removed. Kyle to also work on emitting all EnergyPlus objects that are supported by Spawn.

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.
4. Output variables and EMS actuators need not be present in the idf file.

Need to specify contract for coupling radiant systems, such as slab with pipes embedded, or radiant panel.

Suggestion: Modelica sends surface temperature to EnergyPlus, and EnergyPlus returns to Modelica heat flow rates from room air, solar, and infrared gains to the surface. The vertices of the object are determined in EnergyPlus idf file. This is similar than an other-side surface in EnergyPlus.

Stuart to work on small example with time events (sampler) and with reinit. Need updated OCT distribution.

Inform Modelon about any open issues for these constructs.

No discussions.

Next:

• Work on experiment specification.

Michael to test Buildings library with MSL 4.0.0 beta.

Include in this year's NREL contract. Support for Spawn on OS X (won't include the optimization and other Modelon libraries).

No discussion, waiting for NREL 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.

Enabled installation and run on Windows OS. Fixed failed parsing due to the DynamicSelect.

To do:

Address TypeError issues reported in #106, #107. Enable parsing packages in CDL mode. Handling replaceable models.

None.

See next steps under "Refactoring room air balance".

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