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