Article (Scientific journals)
Comparison of Moving Boundary and Finite-Volume Heat Exchanger Models in the Modelica Language
Desideri, Adriano; Dechesne, Bertrand; Wronski, Jorrit et al.
2016In Energies
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Keywords :
organic Rankine cycle (ORC); dynamic modeling; dynamic validation; Modelica
Abstract :
[en] When modeling low capacity energy systems, such as a small size (5–150kWel) organic Rankine cycle unit, the governing dynamics are mainly concentrated in the heat exchangers. As a consequence, the accuracy and simulation speed of the higher level system model mainly depend on the heat exchanger model formulation. In particular, the modeling of thermo-flow systems characterized by evaporation or condensation requires heat exchanger models capable of handling phase transitions. To this aim, the finite volume (FV) and the moving boundary (MB) approaches are the most widely used. The two models are developed and included in the open-source ThermoCycle Modelica library. In this contribution, a comparison between the two approaches is presented. An integrity and accuracy test is designed to evaluate the performance of the FV and MB models during transient conditions. In order to analyze how the two modeling approaches perform when integrated at a system level, two organic Rankine cycle (ORC) system models are built using the FV and the MB evaporator model, and their responses are compared against experimental data collected on an 11kWel ORC power unit. Additionally, the effect of the void fraction value in the MB evaporator model and of the number of control volumes (CVs) in the FV one is investigated. The results allow drawing general guidelines for the development of heat exchanger dynamic models involving two-phase flows.
Disciplines :
Energy
Author, co-author :
Desideri, Adriano ;  Université de Liège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Dechesne, Bertrand ;  Université de Liège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Wronski, Jorrit
Van Den Broek, Martijn;  Ghent University > Department of Flow heat and combustion Mechanics > Assistant Professor
Gusev, Sergei;  Ghent University > Department of Flow heat and combustion Mechanics > Technician
Lemort, Vincent  ;  Université de Liège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Quoilin, Sylvain  ;  Université de Liège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Language :
English
Title :
Comparison of Moving Boundary and Finite-Volume Heat Exchanger Models in the Modelica Language
Publication date :
2016
Journal title :
Energies
ISSN :
1996-1073
Publisher :
Multidisciplinary Digital Publishing Institute (MDPI), Switzerland
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
The Next Generation Organic Rankine Cycles
Funders :
IWT SBO-110006 project
Available on ORBi :
since 10 May 2016

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