Paper Conference

Proceedings of Building Simulation 2011: 12th Conference of IBPSA


Advanced analysis of coupled 1D / 3D simulation models by the use of a solar thermal system

Manuel Ljubijankic, Christoph Nytsch-Geusen, Alessandro Jänicke

Abstract: This paper presents an advanced analysis of numerical coupled 1D / 3D simulation models in the field of building energy supply systems. Here, the 1D models are described in Modelica, which is a component-oriented modelling description language for DAE (Differential-Algebraic-Equation)-systems. The 3D simulation models are described with the CFD (Computational Fluid Dynamics) method. The goal is to divide the complex model of a building energy supply system in dependency of the weather solar collector solar loop controller heat exchanger storage loop thermal storage complexity of the flow conditions into several 1D or 3D sub-models in such a way, that the coupled submodels represent the real system as realistic as possible during the simulation experiment. Based on previous studies on this topic, simulation models with different resolutions in space and time are considered to find an optimum between required accuracy and minimal computing time.
Pages: 1871 - 1877