Thermal conductivity enhancement of erythritol as PCM by using graphite and nickel particles

We developed new phase change composites (PCC) using erythritol as a phase change material (PCM) and graphite and nickel particles as highly thermal conductive fillers. Their effective thermal conductivities became two orders of magnitude larger than that of the original PCM. The PCC was prepared by...

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Veröffentlicht in:Applied thermal engineering Jg. 61; H. 2; S. 825 - 828
Hauptverfasser: Oya, Teppei, Nomura, Takahiro, Tsubota, Masakatsu, Okinaka, Noriyuki, Akiyama, Tomohiro
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Kidlington Elsevier Ltd 03.11.2013
Elsevier
Schlagworte:
Applied sciences
Composite
Dispersion
Energy
Energy. Thermal use of fuels
Erythritol
Exact sciences and technology
Fillers
Graphite
Heat transfer
Nickel
Particulate composites
Percolation
Phase change
Phase change material
Theoretical studies. Data and constants. Metering
Thermal conductivity
Transport and storage of energy
Thermal conductivity
Percolation
Phase change material
Composite
Dispersion
Graphite
Nickel
PCM material
ISSN:1359-4311
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Zusammenfassung:We developed new phase change composites (PCC) using erythritol as a phase change material (PCM) and graphite and nickel particles as highly thermal conductive fillers. Their effective thermal conductivities became two orders of magnitude larger than that of the original PCM. The PCC was prepared by using a conventional dispersion technique and its effective thermal conductivity was measured by the laser flash method at room temperature. We interpreted the results based on percolation theory, for which the effects of the graphite structure and the volumetric ratio on the effective thermal conductivity were examined. The results showed that the effective thermal conductivity increased gradually with increasing filler content and aspect ratio of filler. Of significance, they increased remarkably when we used 20 vol% spherical graphite. Moreover, among the three samples that we prepared, the greatest thermal conductivity, 4.72 W(m K)−1, was recorded for the PCC with 15 vol% expanded graphite content. This was 6.4 times higher than the thermal conductivity of pure erythritol. ► We developed a phase change composite (PCC) using graphite having different shape. ► The enhancement of thermal conductivity on PCC was subject to the shape of fillers. ► The thermal conductivity of PCC was calculated by Nielsen's equation.
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ISSN:1359-4311
DOI:10.1016/j.applthermaleng.2012.05.033