Thermal Conductivity of High-Temperature Multicomponent Materials with Phase Change

This work focuses on the investigation of the effective thermal conductivity (λ eff ) of heterogeneous materials consisting of a phase change material (PCM) and expanded graphite (EG). These composites may be employed in latent heat storage systems, where a PCM stores energy by being heated to a tem...

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Bibliographic Details
Published inInternational journal of thermophysics Vol. 29; no. 2; pp. 678 - 692
Main Authors do Couto Aktay, K. S., Tamme, R., Müller-Steinhagen, H.
Format Journal Article
LanguageEnglish
Published Boston Springer US 01.04.2008
Subjects
Classical Mechanics
Condensed Matter Physics
Industrial Chemistry/Chemical Engineering
Physical Chemistry
Physics
Physics and Astronomy
Phase change materials
Thermal conductivity
Latent thermal energy storage
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Summary:This work focuses on the investigation of the effective thermal conductivity (λ eff ) of heterogeneous materials consisting of a phase change material (PCM) and expanded graphite (EG). These composites may be employed in latent heat storage systems, where a PCM stores energy by being heated to a temperature higher than its melting point ( T m ), and releases it during solidification. For the determination of λ eff , the steady-state comparative method was used and modified to measure composite samples at temperatures above T m . Results were compared with the thermal conductivity of the pure PCMs, and a significant increase could be observed. The dependence of λ eff on temperature, as well as the influence of the material microstructure on the enhancement of λ eff , were examined.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0195-928X
1572-9567
DOI:10.1007/s10765-007-0315-7