Fabrication, property characterization and thermal performance of composite phase change material plates based on tetradecanol-myristic acid binary eutectic mixture/expanded perlite and expanded vermiculite for building application

Abstract

A binary eutectic mixture composed of tetradecanol (TD) and myristic acid (MA) was maximally absorbed into the microstructures of expanded perlite (EP) and expanded vermiculite (EVMT), respectively, through a self-made vacuum adsorption roller to prepare phase change material (PCM) particle (PCP). Then EP and EVMT-based composite PCM plates were respectively fabricated through a mold pressing method. The thermal property, chemical stability, microstructure and durability were characterized by differential scanning calorimeter (DSC), Fourier transform infrared spectroscope (FT-IR), scanning electron microscope (SEM) and thermal cycling tests, respectively. The results show that both PCPs have high latent heats with 110 J/g for EP-based PCP and more than 130 J/g for EVMT-based PCP, compact microstructure without PCM leakage, stable chemical property and good durability. The research results have proved the feasibility for the vacuum adsorption roller used in the composite PCM fabrication. Results of thermal storage performance experiment indicate that the fabricated PCM plates have better thermal inertia than common building materials, and the thermal storage performance of PCM plates has nonlinearly changed with outside air velocity and temperature increase. Therefore, PCM plates show a significant potential for the practical application of building thermal storage.

Keywords

thermal storage / phase change material / expanded perlite / expanded vermiculite / binary eutectic mixture

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