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Fabrication and thermal properties of CaCl2·6H2O–CO(NH2)2/SiO2 as room-temperature shape-stable composite PCM for building thermal insulation
Solar Energy Materials and Solar Cells ( IF 6.3 ) Pub Date : 2021-08-30 , DOI: 10.1016/j.solmat.2021.111355
Yutang Fang 1 , Kai Wang 1 , Yifan Ding 1 , Xianghui Liang 1 , Shuangfeng Wang 1 , Xuenong Gao 1 , Zhengguo Zhang 1
Affiliation  

The combination of room-temperature phase change materials (PCMs) and building materials can reduce the energy consumption of heating equipment and improve indoor thermal comfort. In this paper, the novel CaCl2·6H2O–CO(NH2)2/SiO2 room-temperature shape-stable composite PCM was fabricated by melt-blending method with CaCl2·6H2O as the basic PCM, CO(NH2)2 as the phase change temperature regulator and hydrophilic fumed silica (SiO2) as the carrier. The temperature-regulating effect of CO(NH2)2 on CaCl2·6H2O and the shape-stabilizing effect of SiO2 on CaCl2·6H2O–CO(NH2)2 PCM were emphatically analyzed. The results revealed that the obtained composite PCM with 6% CO(NH2)2 and 20% SiO2 possessed a favorable form-stability, relatively high enthalpy (114.3 J g-1) and appropriate phase change temperature (21.03 °C) which decreased by 7.81 °C compared with pure CaCl2·6H2O (28.84 °C). Furthermore, its small supercooling degree (0.259 °C), low thermal conductivity (0.3667 W·m-1·K-1) as well as the excellent cyclic reliability and thermal stability indicated that the composite PCM has good thermodynamic properties, enabling its application for indoor building thermal insulation and even some other areas.



中文翻译:

CaCl2·6H2O-CO(NH2)2/SiO2 室温形状稳定复合 PCM 用于建筑隔热的制备和热性能

室温相变材料(PCMs)与建筑材料的结合可以降低采暖设备的能耗,提高室内热舒适度。本文以CaCl 2 ·6H 2 O为基本PCM,CO,采用熔融共混法制备了新型CaCl 2 ·6H 2 O-CO(NH 2 ) 2 /SiO 2室温形状稳定复合PCM。(NH 2 ) 2作为相变温度调节剂,亲水性气相二氧化硅(SiO 2 )作为载体。CO(NH 2 ) 2对CaCl 2 ·6H的调温作用2 O和SiO 2对CaCl 2 ·6H 2 O-CO(NH 2 ) 2 PCM的形状稳定作用进行了重点分析。结果表明,得到的含 6% CO(NH 2 ) 2和 20% SiO 2 的复合 PCM具有良好的形状稳定性、较高的热函 (114.3 J g -1 ) 和合适的相变温度 (21.03 °C),与纯CaCl 2 ·6H 2 O (28.84 °C)相比降低了7.81 °C 。此外,其过冷度小(0.259°C),导热系数低(0.3667 W·m -1 ·K -1)以及优异的循环可靠性和热稳定性表明复合相变材料具有良好的热力学性能,使其可应用于室内建筑隔热甚至其他一些领域。

更新日期:2021-08-31
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