Modeling and Simulation of a Solar Energy System
by Use of Bond Graphs


This paper describes a new approach to determine the thermodynamic behavior of a building structure. The bond graph technique is used to model the physical laws of heat transfer between the basic components of a house regarding conduction, convection, and radiation. The modeling language Dymola is used to provide a convenient platform for creating hierarchical and modular component descriptions in readable code. This new approach is compared with two state-of-the-art building analysis programs, CALPAS 3 and DOE-2. For comparison, the thermal performance of an experimental house has been evaluated by all three programs. The results for temperature profiles and heat flow rates have been found to be very similar. Dymola proved to be an excellent modeling tool, very suitable for modeling systems with modular components.
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