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Study on Paraffin/Expanded Perlite Composite Phase Change Energy-Storage Materials

Paraffin/expanded perlite composite phase change energy-storage material (PPCM) was prepared by vacuum adsorption method with expanded perlite as adsorption material and paraffin as phase change energy-storage material. The diffused-exudative circle method was used to determine that the best adsorption quantity of expanded perlite was 65%. The phase transition process and microstructure of PPCM with the best adsorption quantity were characterized by DSC and SEM. The results shown that the internal micropores of expanded perlite particles were almost completely filled with paraffin and the expanded perlite particles became close-grained particles. The phase change temperature of PPCM was basically similar with that of paraffin and its phase change latent heat was corresponded with that of paraffin in the PPCM.