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Reduction techniques for urban energy simulation
Martin GARCIA PEREZ,Eui-Jong KIM,Jean-Jacques ROUX 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
Urban energy simulation is an important research field in today’s urban planning and engineering. This work aims to contribute to the development of methods and tools for energy simulation applied to urban territories. The proposed urban model is based on the assembly of multiple state-space building models and the application of model reduction techniques in order to reduce calculation costs. The first part of the paper is a review of the previous works, so the model and methods are described. Then, the future issues are introduced for further developments.
Kim, Eui-Jong,He, Xi,Roux, Jean-Jacques,Johannes, Ké,vyn,Kuznik, Fré,dé,ric ELSEVIER 2019 APPLIED ENERGY -BARKING THEN OXFORD- Vol.238 No.-
<P><B>Abstract</B></P> <P>Recent developments in building energy models for urban energy simulation are primarily based on bottom-up modelling (<I>N</I> models used for <I>N</I> buildings). This work aims to develop a single assembled model for multiple buildings for convenient use in detailed urban analysis. The proposed model exhibits state-space model formalism, and a state-size reduction technique is applied to maintain model accuracy, even for a low-order representation. To accelerate the calculation time and ensure numerical stability, a direct solver is proposed to eliminate the iterative calculations required in Dymola for annual load calculations. The results of the proposed reduced model are in good agreement with the reference model. For a test case of ten buildings, a 2nd order reduced model (i.e., 2 differential equations) with the proposed direct solver can predict accurately the dynamic energy behaviour, resulting in an error of about 0.43% for the annual loads.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new fast and accurate district heating and cooling loads calculation method is proposed. </LI> <LI> Mathematical reduction technics are applied to the set of differential equations representing physics. </LI> <LI> The solver Dymola is used to calculate the load profiles. </LI> <LI> Only 2 differential equations are required to calculate the energy loads of 10 buildings. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>