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国际计算热科学期刊
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 0.7

ISSN 打印: 1940-2503
ISSN 在线: 1940-2554

国际计算热科学期刊

DOI: 10.1615/.2014010938
pages 329-339

THERMAL CONDUCTIVITY ENHANCEMENT OF PCMS FOR AUTOMOTIVE THERMAL ENERGY STORAGE APPLICATIONS: EXPERIMENTAL AND NUMERICAL INVESTIGATIONS

Julien Tissot
Valeo Thermal Systems, 8 rue Louis Lormand, Le Mesnil Saint Denis Cedex, 78321 La Verriere, France
Michael Lissner
Valeo Thermal Systems, 8 rue Louis Lormand, Le Mesnil Saint Denis Cedex, 78321 La Verriere, France; Irstea GPAN LGP2ES (EA21), 1 rue Pierre Gilles de Gennes, 92761 Antony Cedex, France
Kamel Azzouz
Valeo Thermal Systems, 8 rue Louis Lormand, Le Mesnil Saint Denis Cedex, 78321 La Verriere, France
Denis Leducq
Irstea GPAN LGP2ES (EA21), 1 rue Pierre Gilles de Gennes, 92761 Antony Cedex, France

ABSTRACT

This study focuses on the evaluation of the equivalent thermal conductivity of a composite material comprising a phase change material (PCM) and periodic aluminum fins. This composite is a part of a heat accumulator. The evolution of the thermal conductivity with the fin volume fraction was studied through experimental measurements and numerical simulations. Two numerical models were developed on the basis of the resolution of 2D heat transfer equations with the finite volume method in order to determine the impact of the fin volume fraction on the thermal conductivity of the medium. In the first model, fins and PCM were modeled, while in the second model, the fins were not directly simulated but taken into account in terms of equivalent conductivity. A prototype was evaluated on a test bench in order to calibrate the equivalent conductivity and validate the modeling. A numerical parametric study was performed and showed that the equivalent conductivity can increase up to 150 times the PCM conductivity with a better distribution of the fins in the PCM. A correlation of the PCM equivalent thermal conductivity as a function of fin pitch is given for a range of aluminum volume fractions from 0 to 65%.


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