PREPARATION AND PERFORMANCE STUDY OF PARAFFIN-POLYETHYLENE GLYCOL DOUBLE-GRADIENT COMPOSITE PHASE CHANGE MATERIALS

Lyu Youfu; Chu Tianying; Li Haonan; Liu Shitong; Xiao Junbing; Li Chuanchang

doi:10.19912/j.0254-0096.tynxb.2024-0525

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (8) : 216-223. DOI: 10.19912/j.0254-0096.tynxb.2024-0525

PREPARATION AND PERFORMANCE STUDY OF PARAFFIN-POLYETHYLENE GLYCOL DOUBLE-GRADIENT COMPOSITE PHASE CHANGE MATERIALS

Lyu Youfu^1,2, Chu Tianying¹, Li Haonan¹, Liu Shitong¹, Xiao Junbing¹, Li Chuanchang^1,2

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Abstract

Based on the melt blending method, a wide temperature gradient composite phase change material （WT-CPCM） with different proportions was prepared using paraffin （PA） and polyethylene glycol （PEG） as phase change matrix materials, mesophase nano-SiO₂ and EG as binders, thermal conductivity additives, and shaping materials. The thermal storage density, thermal conductivity, high-temperature stability, and temperature response of WT-CPCM under different power heating were measured. The experimental results show that the thermal conductivity and thermal storage density of WT-CPCM are closely related to the proportion of each component： when the ratio of PA to PEG is 50∶110, and the thermal conductivity filler nano-SiO₂ is 0.5% and EG is 1.5%, the maximum thermal conductivity of WT-CPCM is 0.71 W/（m·K）. Further filling into the Al₂O₃ porous carrier results in a thermal conductivity of 1.06 W/（m·K）, which is 4.2 and 3.8 times higher than that of pure materials PA and PEG; The heat storage/release process of WT-CPCM has two typical characteristic peaks, with a total latent heat value of 186.49 J/g. Under different heating powers, the thermal response curve of WT-CPCM responds quickly.

Key words

paraffin / polyethylene glycol / heat storage / expanded graphite / composite phase change materials

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Lyu Youfu, Chu Tianying, Li Haonan, Liu Shitong, Xiao Junbing, Li Chuanchang. PREPARATION AND PERFORMANCE STUDY OF PARAFFIN-POLYETHYLENE GLYCOL DOUBLE-GRADIENT COMPOSITE PHASE CHANGE MATERIALS[J]. Acta Energiae Solaris Sinica. 2025, 46(8): 216-223 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0525

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