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42. Preparation and Thermal Performances of Lauric Acid/Polyvinyl Butyral/Graphene Nanoplates Composite Phase Change Materials.

Author

Wang, Wenze, Fu, Tingwei, and Fang, Guiyin

Subjects
PHASE change materials, POLYVINYL butyral, LAURIC acid, ENERGY conservation in buildings, HEAT storage
Abstract

In recent years, there has been significant progress in the development and application of phase change materials (PCMs) for thermal energy storage. The new lauric acid (LA)/polyvinyl butyral (PVB)/graphene nanoplates (GNP) composite phase change materials (CPCM) are prepared using the solution blending method, in which LA acts as PCM, PVB serves as support material, and GNP is used as thermally conductive enhancer. The prepared CPCM with 80 wt% LA can retain stable shape without leakage. The Fourier‐transform infrared and X‐ray diffractometer results indicate that there is no chemical reaction among the various components of the CPCM. The differential scanning calorimeter results show the CPCM3 (with 80 wt% LA and 5 wt% GNP) has melting latent heat of 134.41 KJ Kg−1 with melting temperature of 41.73 °C. The thermal conductivity tests present that thermal conductivity of CPCM3 is 0.689 W (m K)−1, which is 3.83 times that of the PCM2. The thermogravimetric analyzer results verify that the CPCM possess good thermal stability within the operating temperature range of 35–45 °C without any degradation. The thermal cycling tests indicate that CPCM have good thermal reliability. Therefore, it has promising applications in building energy conservation, solar thermal systems, thermal management, and textiles. [ABSTRACT FROM AUTHOR]

Published
2024
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43. Synthesis and Thermal Properties of Myristic Acid/Nano-TiO2/Carbon Additives Composite Phase Change Materials.

Author

Fu, Tingwei, Wang, Wenze, and Fang, Guiyin

Subjects
PHASE change materials, THERMAL properties, PHASE transitions, THERMAL conductivity, CARBON nanotubes, ADDITIVES
Abstract

A novel composite phase change material, myristic acid (MA)/nano-titanium dioxide (nano-TiO2)/carbon additives, was synthesized via a melt blending method, in which MA serves as phase change material, nano-TiO2 acts as support material, and carbon additives are used as thermally conductive enhancer. A series of leakage tests have shown that MA/nano-TiO2 can maintain shape stability during the phase transition when the content of MA in MA/nano-TiO2 does not exceed 50 %. The FT-IR and XRD results demonstrated that there is no chemical reaction among the various components of the MA/nano-TiO2/carbon additive. When the content of MA is 50 %, the melting temperature of MA/nano-TiO2/carbon additives is about 54 °C and the melting enthalpy is about 80 J·g−1. When the content of all three carbon additives, multiwall carbon nanotubes, graphene, and expanded graphite, is 2.5 %, the corresponding thermal conductivity of MA/nano-TiO2/carbon additives is 0.532 W/(m·K), 1.128 W/(m·K), and 1.382 W/(m·K), respectively. The thermal conductivity of these three types of MA/nano-TiO2/additives is 1.23, 2.62, and 3.21 times that of MA/TiO2, respectively. Moreover, the decomposition temperature of these three types MA/nano-TiO2/carbon additives composites is around 245 °C. Therefore, the working ambient temperature of MA/nano-TiO2/additive composites should be lower than 245 °C. [ABSTRACT FROM AUTHOR]

Published
2024
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