2024 11 4 coordination

IBPSA Modelica Working Group

Date: November 4, 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

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Agenda

Miscellanous (Lucas Verleyen issue with merging IBPSA to IDEAS, doodles for next meetings)

Building Simulation 2025 Paper

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)

Organic Rankine cycle model (Casper)

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 | Ettore Zanetti, LBNL | Antoine Gautier, Solamen | Alessandro Maccarini, Aalborg university | Fabian Wuellhorst, RWTH Aachen | Jelger Jansen, KU Leuven | Lucas Verleyen, KU Leuven | Tobias Spratte, RWTH Aachen

Minutes

IDEAS merging issues

IDEAS CI tests generate small errors. The reason might be due to event generation update in weather reader https://github.com/ibpsa/modelica-ibpsa/issues/1716

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.

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)

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.

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.

ISO 13790 models

Michael to carry out final review.

PV collector, battery and electrical component models

No updates.

New state selection

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

Michael work on model initialization? Difference of pressure instead of absolute pressure (in theory is better, in numerical simulation it seems inconclusive it depends on the models, scaling seems to work better) Comparison speed vs accuracy? (speed and if models actually run). Maybe use bounded attribute of real variables.

OCT has been updated and it is a work in progress.

CHP and organic Rankine cycle

#Issue1921 CHP merged in the library.

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 (No updates)
    • 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

Kick-off meeting in November. If interested in an advisory board work with Oliver Lenord to issue NDA contract. Come up with requirements:
data source large models (compilation, simulation, optimization, UQ) provide library of models computationally expensive ones numerically problematic ones (see also https://ibpsa.github.io/modelica-challenge-problems/)

New action items

Previous action items