2021 01 27_meeting - lbl-srg/soep GitHub Wiki

SOEP Coordination meeting

Date: January 27, 2021, 8:15am-9am Pacific Times

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

Meeting information

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

Agenda

  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

Participants

Kyle Benne
Stuart Mentzer
Baptiste Ravache
Amir Roth
Michael Wetter

Minutes

Milestones

LBL AOP 9/30 (go/no-go): Release that can couple Modelica-based control to E+. OK to release in early 2021.
LBL AOP 3/30: Implemented radiant slab coupling in Spawn.
LBL AOP 3/30: Release Buildings Library with radiant slab coupling.
LBL AOP 6/30 (go/no-go): Posted beta version of Spawn (jointly with NREL, Objexx and Modelon)

Release of Spawn coupling

Refactoring room air balance

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

Next, work on

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

Contract:

  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.

Radiant systems

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

To be done in FY 21.

FMI-QSS

Improved derivative approximation to use forward derivatives after events. Next is to work on improved root finder for cubic equations.

Works on more examples later this week to investigate what condidtions cause problems.

Optimica license protection

Michael works with Modelon on license protection.

JSON representation for OS front-end to Modelica

No discussion.

To do:

  • Handling replaceable models.

Other items

None.

New action items

None.

Previous action items

Michael to keep working with Modelon on making dp of pressure drop elements a state rather than p using stateSelect. Check tearing variables and make sure they don't go to zero.

⚠️ **GitHub.com Fallback** ⚠️