Thermal properties and thermal cycling stability of hydrated salt/expanded graphite composite phase change materials

doi:10.19799/j.cnki.2095-4239.2023.0643

Abstract

Abstract:

A composite phase change material (cPCM) was prepared in this study using the melt-blending method. It contained sodium acetate trihydrate as the main phase change material, disodium phosphate dodecahydrate as the nucleating agent, sodium carboxymethyl cellulose as the thickening agent, and expanded graphite as an additive to enhance thermal conductivity. The material properties were characterized and measured using a scanning electron microscope, rheometer, balance, differential scanning calorimeter, and thermal constant analyzer. The thermal cycling stability of the cPCM was evaluated using a thermal cycling system. The results demonstrated that expanded graphite enhanced the thermal conductivity and viscosity of the cPCM. However, it also affected the latent heat and apparent density of the cPCM. As the expanded graphite content increased from 1% to 6%, the thermal conductivity of the cPCM increased from 1.055 to 2.247 W/(m·K), the apparent density decreased from 1.13 to 0.77 g/cm³, and the latent heat decreased from 266.2 to 232.7 J/g. The thermal cycling experiments revealed that the cPCM with 1% expanded graphite exhibited excellent thermal cycling stability, with an effective cycle ratio of >92% and a low supercooling degree (generally <8 ℃) in 530 thermal cycles.

Key words: eutectic hydrate salts, composite phase change materials, expanded graphite, thermal cycling

CLC Number:

TK 121

Yunhan LIU, Liang WANG, Shuang ZHANG, Xipeng LIN, Zhiwei GE, Yakai BAI, Lin LIN, Haisheng CHEN. Thermal properties and thermal cycling stability of hydrated salt/expanded graphite composite phase change materials[J]. Energy Storage Science and Technology, 2023, 12(12): 3627-3634.

Figures/Tables 12

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