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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

THE ENTHALPY-POROSITY METHOD WITH A RECTANGULAR SPECIFIC HEAT CURVE

Wim Beyne
Department of Flow, heat and combustion mechanics, Faculty of Engineering and Architecture, Ghent University, Sint Pietersnieuwstraat 41, Ghent, Belgium; Flanders Make, the strategic research centre for the manufacturing industry, Belgium

Bernd Ameel
Department of Flow, heat and combustion mechanics, Faculty of Engineering and Architecture, Ghent University, Sint Pietersnieuwstraat 41, Ghent, Belgium

Alvaro de Gracia
Department of Mechanical Engineering, University of Rovira i Virgili, Av. dels Països Catalans 26, 43007, Tarragona, Spain

Gabriel Zsembinszki
GREA Innovació Concurrent, INSPIRES Research Centre, University of Lleida, Pere de Cabrera s/n, 25001, Lleida, Spain

Luisa F Cabeza
University of Lleida

Michel De Paepe
Department of Flow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41, 9000 Ghent, Belgium; Flanders Make vzw, Celestijnenlaan 300 – bus 4027, 3000, Leuven, Belgium

DOI: 10.1615/IHTC16.ctm.023939
pages 3841-3848


KEY WORDS: Computational methods, Energy conversion and storage, Phase change materials, thermal energy storage

Abstract

Phase change materials (PCM) are studied extensively as a means to increase energy density of thermal energy storage systems. The design of PCM systems is often done numerically using the enthalpy porosity method. However, commercial software packages often apply a non-realistic specific heat curve. The present article investigates the effect of applying a rectangular specific heat curve with the enthalpy-porosity method by using different peak temperatures and melting ranges while keeping the total latent heat constant. Furthermore, the simulations are compared to a purely conductive model to analyze the effect of natural convection. The simulations show that convection has an effect on total phase change times, which increases with decreasing temperature gradients.

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