Fabrication of heat storage pellets composed of microencapsulated phase change material for high-temperature applications
Fabrication of heat storage pellets composed of microencapsulated phase change material for high-temperature applications
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DOI：
10.1016/j.apenergy.2020.114673
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发表时间：
2020-05
期刊：
影响因子：
11.2
通讯作者：
Hiroki Sakai;Nan Sheng;A. Kurniawan;T. Akiyama;T. Nomura
中科院分区：
文献类型：
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作者：
Hiroki Sakai;Nan Sheng;A. Kurniawan;T. Akiyama;T. Nomura
使用金属相变材料（PCM）的潜在热储存是高温热能储存的一个有吸引力的选择。然而，将金属PCM应用于实际应用存在严重的技术障碍，主要是由其高腐蚀性引起的。本研究报告的颗粒型PCM复合材料，主要由微胶囊化的金属PCM，作为一个潜在的可行的解决方案，这个问题的制造。该微胶囊化PCM（MEPCM）具有由Al-25质量% Si构成的芯，其充当PCM。其壳层由Al 2 O3（或Al 2 O3的前驱体）组成，并使用玻璃料作为烧结剂。通过将MEPCM与烧结剂混合、造粒和烧结来制造复合材料。PCM复合材料的熔点约为577 °C，潜热为108-122 J g−1。PCM复合材料的热导率在2.16-3.20 W m-1 K-1的范围内。循环性能表明复合材料具有良好的耐久性。即使经过300次熔化和冷冻试验，颗粒的形状和化学成分也没有明显变化。这些结果表明，本研究中开发的使用MEPCM的颗粒型复合材料的概念将克服利用金属PCM的技术障碍。通过本研究提出的相变储能复合材料的制备方法，可以制备出各种形状的储能结构。因此，这一概念显示出在高温热能储存系统中应用的巨大前景。
Latent heat storage using a metallic phase change material (PCM) is an attractive option for high-temperature thermal energy storage. However, there are serious technical barriers to applying a metallic PCM to practical applications, mainly caused by its high corrosivity. This study reports the fabrication of a pellet-type PCM composite, mainly composed of a microencapsulated metallic PCM, as a potentially viable solution to this issue. This microencapsulated PCM (MEPCM) has a core composed of Al-25 mass% Si, which acts as a PCM. Its shell is composed of Al2O3(or a precursor of Al2O3), and grass frit was used as a sinter agent. The composites were fabricated by mixing the MEPCM with a sintering agent, pelletizing, and sintering. The PCM composites exhibited a melting point of ~577 °C and a latent heat of 108–122 J g−1. The thermal conductivities of the PCM composites were in the range of 2.16–3.20 W m−1K−1. The cycling performance demonstrated the good durability of the composites. There were no significant changes in the shape and chemical composition of the pellets, even after 300 cycles of melting and freezing tests. These results indicate that the concept of pellet-type composites using MEPCM developed in this study will overcome the technical barriers to utilizing metallic PCMs. Thermal energy storage structures in various shapes could be fabricated via the method for fabricating PCM composites proposed in this study. This concept therefore shows substantial promise for application in high-temperature thermal energy storage systems.