Abstract
As phase change heat storage material(PCM), composites of paraffin/expanded graphite of different particle sizes(DPS-EG) were prepared by melt blending method, which were then characterized by means of XRD, FT- IR, SEM, DSC and LFA. The effect of mass fraction of DPS- EG on performance of the composite PCM was studied. Results show that the thermal diffusivity of the composite PCM increased first and then decreased with the increasing mass fraction of small particle sized EG.When the ratio of mass fraction for large sized ones to the small ones of the DPS-EG was 9:1, paraffin may be allowed to fill fully into the free space of the mosaic structure of DPS-EG. The thermal diffusivity of the composite PCM was up to 1.964×10- 6m2/s, 22 times higher than that of pure paraffin, while its latent heat was 144.2 J/g.
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