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Advanced Nanocomposite Phase Change Material Based on Calcium Chloride Hexahydrate with Aluminum Oxide Nanoparticles for Thermal Energy Storage

Li, Xiang, Zhou, Yuan, Nian, Hongen, Zhang, Xinxing, Dong, Ouyang, Ren, Xiufeng, Zeng, Jinbo, Hai, Chunxi, Shen, Yue
Energy & Fuels 2017 v.31 no.6 pp. 6560-6567
aluminum oxide, calcium chloride, energy, fuels, heat transfer, nanocomposites, nanoparticles, solar thermal energy, supercooling, temperature, thermal conductivity, thermal stability
The present study prepared nanocomposite phase change materials (PCMs) based on calcium chloride hexahydrate (CaCl₂·6H₂O) with gamma aluminum oxide (γ-Al₂O₃) nanoparticles to characterize phase change behavior, such as the supercooling degree, phase change temperature, latent heat, thermal conductivity, and thermal stability. Results demonstrate that thermal conductivity and heat transfer of the CaCl₂·6H₂O/γ-Al₂O₃ nanocomposite PCMs are significantly enhanced and supercooling of CaCl₂·6H₂O/γ-Al₂O₃ nanocomposite PCMs is suppressed. Moreover, a 50 run cycling test verifies that the CaCl₂·6H₂O nanocomposite PCMs contained with 1 wt % γ-Al₂O₃ possesses enhanced thermal behavior. The degree of supercooling is within the range of 0.3–1.1 °C; the maximum reductions in the latent heat is 5.9%; and no phase segregation was observed. The CaCl₂·6H₂O/γ-Al₂O₃ nanocomposite PCMs presented acceptable thermal reliability, chemical stability, and heat transfer characteristics, thereby reflecting its acceptability for low-temperature solar thermal energy storage applications.