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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

LIMITS OF LATENT HEAT STORAGE CHARGING

Bart Peremans
KU Leuven, Department of Mechanical Engineering, Leuven, 3001, Belgium; EnergyVille, Genk, 3600, Belgium

Maarten Blommaert
KU Leuven, Energyville

Jan Diriken
EnergyVille, Genk, 3600, Belgium; Flemish Institute for Technological Research (VITO), Mol, 2400, Belgium

Martine Baelmans
KU Leuven, Department of Mechanical Engineering, Leuven, 3001, Belgium; EnergyVille, Genk, 3600, Belgium

Abstract

Charging latent heat storages is limited by the low thermal conductivity of Phase Change Materials (PCMs). In the present work, a combined numerical-analytical study reveals the limits of PCM charging in terms of the governing non-dimensional properties. A Pareto front between energy and power density is obtained, presenting the trade-off between storage capacity and charging rate for these idealised limits. The results show that the characteristic length, i.e. the maximum distance between PCM material and a heat exchanging surface, should be reduced as much as possible in order to reach the highest performance. The Pareto front reveals that, depending on the PCM/metal combination, the maximal metal volume fraction should not exceed 70 to 95%. Furthermore, the optimal metal volume fraction depends on energy density versus charging power requirements. The performance of existing latent heat storages are situated in the developed framework for charge limits.

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