月桂酸-十四酸/纳米二氧化硅/活性炭复合相变储能材料的制备与性能研究

Preparation and research of lauric-myristic acid/nano-silica/activated carbon composite phase change energy storage materials

以月桂酸-十四酸(LA-MA)二元共晶混合物为相变材料,纳米二氧化硅(nano-SiO_(2))为支撑材料,活性炭(AC)为导热剂,采用熔融共混法制备了具有高导热系数的LA-MA/nano-SiO_(2)/AC复合相变材料。泄漏性测试表明吸附在nano-SiO_(2)中的LA-MA最佳质量分数为60%。热常数分析仪测量结果表明,当AC质量分数为5%时,复合相变材料的导热系数为0.247W/(m·K),比未添加AC的复合相变材料提高了41.95%。差示扫描量热分析结果表明,AC质量分数为5%的复合相变材料熔融温度为30.3℃,相变潜热为71.7kJ/kg。此外,通过扫描电子显微镜、傅里叶变换红外光谱仪和热重分析仪对复合相变材料的微观结构、化学组成和热稳定性进行了分析。结果表明LAMA/nano-SiO_(2)/AC复合相变材料具有良好的热稳定性、热能储存特性,在建筑领域具有广阔的应用前景。

The lauric-myristic acid(LA-MA)/nano silicon dioxide(nano-SiO_(2))/activated carbon(AC)composite PCM with high thermal conductivity was prepared by melt blending method using LA-MA binary eutectic mixture as PCM,nano-SiO_(2)as support material,and AC as thermal conductivity agent.Leakage experiments demonstrated that the optimal percentage of LA-MA adsorbed in nano-SiO_(2)was 60wt%.The results of thermal constant analyzer measurement showed that heat transfer coefficient of the composite PCM with 5wt%AC was 0.247W/(m·K),which increased by 41.95%higher than that of the composite PCM without AC.DSC results showed that the melting temperature and latent heat of the composite PCM with 5wt%AC were 30.3℃and 71.7kJ/kg,respectively.The microstructure,chemical composition and thermal stability of composite PCMs were tested by SEM,FT-IR and TGA.There test results showed that LA-MA/nano-SiO_(2)/AC composite PCM had good thermal stability and heat storage characteristics,and widely application future in the field of architecture.