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Thermal properties of phase change cement board with capric acid/expanded perlite form-stable phase change material

Tianyu Li,Yanping Yuan,Nan Zhang

Capric acid/expanded perlite form-stable phase change materials were prepared by vacuum adsorption. The phase change cement boards were prepared by adding capric acid/expanded perlite into cement mortar, and their thermal properties were tested. The results show that capric acid/expanded perlite improves the thermal storage capacity of the cement board; the latent heats of melting and freezing were 14.25 and 14.1 J g−1, respectively, at 20 wt% capric acid/expanded perlite. Capric acid/expanded perlite enhanced the specific heat capacity of the cement board, and the higher the content of the capric acid/expanded perlite in the cement board is, the higher the equivalent specific heat capacity is. Capric acid/expanded perlite also significantly reduced the thermal conductivity and the heat storage coefficient, while at the same time, increased the thermal inertia coefficient of the cement board. Compared with the ordinary cement board, the thermal conductivity of phase change cement board with mass ratios of 10, 15, and 20 wt% of capric acid/expanded perlite decreased by 39.4%, 47.83%, and 52.49% at 20°C and 37.94%, 46.84%, and 50.63% at 50°C, respectively; the heat storage coefficients decreased by 34.07%, 40.62%, and 44.87% at 20°C and 30.25%, 35.59%, and 37.65% at 50°C, respectively; the thermal inertia coefficients increased by 8.75%, 13.78%, and 15.96% at 20°C, and 8.75%, 21.53%, and 26.21% at 50°C, respectively.