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2021 03 24_meeting

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Michael Wetter edited this page Mar 24, 2021 · 6 revisions

SOEP Coordination meeting

Date: March 24, 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. DOE Lab sharing session
  3. Modelica Conference paper
  4. Kyle, Michael: EnergyPlus-Modelica coupling.
  5. Kyle, Michael: EnergyPlus I/O variables.
  6. Michael, Kyle: Support for radiant systems.
  7. Stuart: FMI-QSS.
  8. Kyle, Michael: Optimica license protection.
  9. Jianjun: JSON representation for OS front-end to Modelica
  10. Other items

Participants

Kyle Benne
Hakan Lyngsjo
Stuart Mentzer
Joshua New
Baptiste Ravache
Hubertus Tummescheit
Jianjun Hu
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)

DOE Lab Sharing Session

Presentation on April 6. Slides added by Tuesday March 30.

Modelica Conference Paper

To be developed with Kyle and Baptiste as co-author.

Finish draft by March 29. Final revisions for last review by April 9.

EnergyPlus-Modelica coupling

Binary code freeze by April 2.

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

Next, work on

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.

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.

How would the other side surface temperature be modeled if these objects where a radiant slab:

BuildingSurface:Detailed,
  Living:Floor,            !- Name
  FLOOR,                   !- Surface Type
  FLOOR:LIVING,            !- Construction Name
  LIVING ZONE,             !- Zone Name
  Surface,                 !- Outside Boundary Condition
  Living:Floor,            !- Outside Boundary Condition Object
  NoSun,                   !- Sun Exposure
  NoWind,                  !- Wind Exposure
  0,                       !- View Factor to Ground
  4,                       !- Number of Vertices
  0,0,0,  !- X,Y,Z ==> Vertex 1 {m}
  0,10.778,0,  !- X,Y,Z ==> Vertex 2 {m}
  17.242,10.778,0,  !- X,Y,Z ==> Vertex 3 {m}
  17.242,0,0;  !- X,Y,Z ==> Vertex 4 {m}
For now, the above is modeled with the slab coupled to a ground model in Modelica, but could we use the ground model of EnergyPlus?

How would we couple the outside facing surface of a radiant ceiling if it were used to model the construction below? 

BuildingSurface:Detailed,
  WestRoof,                !- Name
  ROOF,                    !- Surface Type
  ROOF,                    !- Construction Name
  ATTIC ZONE,              !- Zone Name
  Outdoors,                !- Outside Boundary Condition
  ,                        !- Outside Boundary Condition Object
  SunExposed,              !- Sun Exposure
  WindExposed,             !- Wind Exposure
  0.9,                     !- View Factor to Ground
  4,                       !- Number of Vertices
  10.323,16.876,2.4384,  !- X,Y,Z ==> Vertex 1 {m}
  10.323,10.778,2.4384,  !- X,Y,Z ==> Vertex 2 {m}
  13.782,7.3172,3.8804,  !- X,Y,Z ==> Vertex 3 {m}
  13.782,16.876,3.8804;  !- X,Y,Z ==> Vertex 4 {m}

See proposed specification at https://github.com/lbl-srg/soep/issues/60 and implementation at https://github.com/lbl-srg/modelica-buildings/tree/issue2358_spawn_surface_2_sided

Discussion: Move ahead with implementation of the new object for the April 2 freeze data. Michael to post specification today.

FMI-QSS

No discussion. Stuart is working on analysis with Modelon.

Optimica license protection

Next week should be Modelon-side implementation of license protection.

JSON representation for OS front-end to Modelica

No discussion.

Other items

None.

New action items

Kyle/Michael: Work on implementation of interface for both surfaces of a construction, keeping freeze date of April 2 in mind.

Previous action items

Kyle to add validation of setting surfaces in EnergyPlus.

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