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Michael Wetter edited this page Dec 16, 2024 · 5 revisions

IBPSA Modelica Working Group

Date: December 16, 2024, 8:00 - 9:00 Pacific Times.

The purpose of this meeting is to coordinate the Modelica IBPSA Working Group.

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

Fabian presentation on CI testing

Miscellanous (Sizing cheat sheet)

Building Simulation 2025 Paper

Update to Dymola 2025x

CDL integration

Geothermal models

Heat pumps

ATES model (Alessandro Maccarini)

ISO 13790 models (Alessandro Maccarini)

PV collector, battery and electrical component models (Laura Maier)

New state selection (Michael Wetter)

Integration of new models into the library

OpenSCALING project updates

Progress on pull requests, https://github.com/ibpsa/modelica-ibpsa/pulls

Participants

| Michael Wetter, LBNL | Casper Fu, LBNL | Massimo Cimmino, Polytechnique Montreal | Alessandro Maccarini, Aalborg University | Victor Braciszweski, Smith Group | Fabian Wuellhorst, RWTH Aachen

Minutes

Fabian presentation

To be presented next time when Jelger is also present.

Building Simulation 2025 Paper

Michael shared outline that was discussed. Short space to describe new models, come up with one way to define each model and replicate with other for consistency. Michael to share OverLeaf paper outline with abstract authors. Fabian to come up with first model description structure that other people will follow.

Update to Dymola 2025x

Michael to update CI testing.

CDL integration

Michael made PR https://github.com/ibpsa/modelica-ibpsa/pull/1946 Ready for review.

The CDL specification is at https://obc.lbl.gov/specification/cdl.html

Fabian to provide a review.

Geothermal models

Is anyone working on

  • inclined boreholes
  • energy piles
  • adding option for coaxial pipes to existing borehole/borefield models (check Buildings branch issue2906_iceStoDisCoo)

Massimo plans to first look into horizontal systems, with applications also to pipes.

Inclined boreholes is in discussion with Jianjun, will need different g-function calculations.

Massimo could help on reviewing coaxial pipes. See also https://rygancorp.com/our-process/

Heat pumps

Is anyone working on

  • 4 pipe AWHP

  • 6 pipe WWHP --> Fabian mentioned model developed by his colleague with multidimensional array performance maps. There is a gap in the Modelica standard library for n-dimensional combi tables.

  • Dynamic model for defrost --> Ettore working with Donghun to validate grey box model.

Fabian is working on a validation of a defrost model.

ATES model

Alessandro had a meeting with TU Delft, where we agreed on a set of simulation cases that vary based on three parameters: injection temperature (5°C, 20°C, 40°C), building size (10 kW, 100 kW, 1000 kW), and storage cycle (daily, weekly, and seasonal). The TU Delft team is currently running these simulations using SEAWAT. Once they complete their task, we will compare their results with those obtained from the Modelica-based simplified model.

Mohammed will go to TU Delft to work on validation of the Modelica model. Expected results before summer 2025.

ISO 13790 models

Moved to the master branch.

PV collector, battery and electrical component models

No updates.

New state selection

https://github.com/ibpsa/modelica-ibpsa/issues/1412

Closed for now as this needs more research.

Integration of new models into the library

New models to be developed/integrate:

  • Discussions about others and future development, such as
    • APPROVED
      • enthalpy and energy recovery wheel (Oakridge national lab is working on a model for the Buildings that could be integrated)
      • validation of models (No updates)
      • CDL integration (https://github.com/ibpsa/modelica-ibpsa/pull/1946)
      • preconfigured controls (No updates)
    • NEED MORE DISCUSSION
      • NEW: Zoned borefields (https://github.com/lbl-srg/modelica-buildings/pull/3812) (could be moved to IBPSA)
      • thermal storage (No updates)
      • better dynamic ground coupling of long district pipes (PR merged into Buildings, to be moved to IBPSA)
      • more geothermal (horizontal loop, slinky loop, others) (Massimo could look into specific modelling efforts that have been done by co-workers)

OpenSCALING project updates

No update.

New action items

Work on pull request.

Previous action items

None.

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