ThermoBondLib: Thermo-Bond Graph Library for Dymola/Modelica

Introduction

Bond graphs describe the power flows through a physical system. Since the concepts of energy conservation and power flow continuity are valid for all physical systems, bond graphs may be employed for modeling any and all physical phenomena.

Bond graphs form an intuitively attractive modeling tool that enables its user to understand and explain the dynamics of physical processes clearly and succinctly. For this reason, bond graphs are suitable both as a didactic and also as a highly practical tool for modelng physical systems.

Thermo-bond graphs form an extension of regular bond graphs. Some thermal phenomena, such as heat conduction and radiation, can be modeled using the regular bond graphs. However when modeling convective flows, a difficulty is being encountered, as the convective flow of heat is always accompanied by corresponding flows of mass and volume.

Thermo-bond graphs contain three parallel bondgraphic tracks, one of which describes the mass flow, whereas the second concerns itself with the coupled volume flow, and the third computes the accompanying entropy flow.

Thermo-bonds look exactly like regular bonds. However, they are painted in red in the ThermoBondLib library. Their connectors connect 11 instead of 3 variables. Internally, thermo-bonds are composed by regular bond graph elements (black bonds). For this reason, the library of regular bond graphs ( BondLib) must always be loaded together with ThermoBondLib.

Historical Development

• The development of ThermoBondLib began with the student exchange visit of Jürgen Greifeneder at the University of Arizona. The results of his research efforts have been documented in Jürgen's diploma project (unfortunately available in German only), which Jürgen submitted to his home university, the University of Stuttgart. Jürgen turned out to be an excellent and extremely ambitious student, who was able to advance the knowledge of the bondgraphic description of convective flows significantly. Jürgen's research already led to six important publications [1-6]. Jürgen's student exchange visit in Tucson was supported by program E3 of the European Union.

• In 2002, Jürgen's models, which he had developed originally without a graphisches frontend under Dymola Version 3, were recoded into Dymola/Modelica Version 4. In this process, a graphical frontend was added. This led to a first version of ThermoBondLib [4].

• In 2005, an enhanced and fully documented version of ThermoBondLib was produced for Dymola/Modelica Version 5. This is the version that is being made available through this web page.

Most Important Publications

1. Greifeneder, J. and F.E. Cellier (2001), Modeling Convective Flows Using Bond Graphs, Proc. ICBGM'01, 5^th SCS Intl. Conf. on Bond Graph Modeling and Simulation, Phoenix, Arizona, pp. 276-284.

2. Greifeneder, J. and F.E. Cellier (2001), Modeling Multi-Phase Systems Using Bond Graphs, Proc. ICBGM'01, 5^th SCS Intl. Conf. on Bond Graph Modeling and Simulation, Phoenix, Arizona, pp. 285-291.

3. Greifeneder, J. and F.E. Cellier (2001), Modeling Multi-element Systems Using Bond Graphs, Proc. ESS'01, 13^th European Simulation Symposium, Marseille, France, pp. 758-766.

4. Cellier, F.E. and J. Greifeneder (2003), Object-oriented Modeling of Convective Flows Using the Dymola Thermo-bond-graph Library, Proc. ICBGM'03, 6^th SCS Intl. Conf. on Bond Graph Modeling and Simulation, Orlando, Florida, pp. 198-204.

5. Cellier, F.E. and J. Greifeneder (2008), ThermoBondLib - A New Modelica Library for Modeling Convective Flows, Proc. 6^th International Modelica Conference, Bielefeld, Germany, Vol.1, pp. 163-172.

6. Cellier, F.E. and J. Greifeneder (2009), Modeling Chemical Reactions in Modelica By Use of Chemo-bonds, Proc. 7^th International Modelica Conference, Como, Italy, pp. 142-150.

Sponsors

• European Union

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