IBPSA Modelica Working Group: Open-source model development based on open standards to accelerate decarbonization

Building Simulation Conference proceedings, vol. 19

Abstract

In 2022, the IBPSA Board of Directors approved the formation of the IBPSA Modelica Working Group, https://ibpsa.github.io/modelica-working-group/. Its purpose is to further develop the Modelica IBPSA Library, and to coordinate the needs of the IBPSA community with the Modelica community using the earlier work of IBPSA project 1 and IEA-EBC Annex 60 as a starting point.This paper gives an overview of the Modelica IBPSA Library (https://github.com/ibpsa/modelica-ibpsa), an open-source, free library of component models for building and district energy systems that is implemented in the Modelica language, an open-standard language for modeling of engineered systems. The paper describes the main recent developments of models for heat pumps, geothermal borefields, aquifer thermal energy storage systems, reduced-order building models, ground-coupled district network pipes, controls modeling based on the emerging ASHRAE Standard 231P, and electrical system simulation. It explains how the library is developed and validated, and how it is being used by the four Modelica libraries that use the Modelica IBPSA Library as its core, namely the AixLib, Buildings, BuildingSystems and IDEAS libraries. Modelica uniquely enables cross domain simulations that can couple electrical, fluid, thermal and other types of models. The paper will close with brief examples that show the range of applications supported by these four libraries that integrate some of the newly developed models.

Authors 11

1. Michael Wetter

   Lawrence Berkeley National Laboratory

   Affiliation as printed

   Lawrence Berkeley National Laboratory , Berkeley , CA , USA

2. Klaas De Jonge

   Ghent University

   Affiliation as printed

   Ghent University , Department of Architecture and Urban Planning , Ghent , Belgium

3. Hongxiang Fu

   Lawrence Berkeley National Laboratory

   Affiliation as printed

   Lawrence Berkeley National Laboratory , Berkeley , CA , USA

4. Jianjun Hu

   Lawrence Berkeley National Laboratory

   Affiliation as printed

   Lawrence Berkeley National Laboratory , Berkeley , CA , USA

5. Jelger Jansen

   KU Leuven

   Affiliation as printed

   KU Leuven , Department of Mechanical Engineering , Leuven , Belgium

6. Filip Jorissen
7. Alessandro Maccarini

   Aalborg University

   Affiliation as printed

   Aalborg University , Department of the Built Environment , Copenhagen , Denmark

8. Laura Maier Aachen Energy Research Center

   RWTH Aachen University

   Affiliation as printed

   Energy Research Center , Aachen , Germany

   Viessmann Climate Solutions , Aachen , Germany

9. Fabian Wuellhorst
10. Ettore Zanetti

    Lawrence Berkeley National Laboratory

    Affiliation as printed

    Lawrence Berkeley National Laboratory , Berkeley , CA , USA

11. Wangda Zuo

    Pennsylvania State University

    Affiliation as printed

    Pennsylvania State University , University Park , PA , USA