Expedited energy charging of water using natural graphite flake for cool thermal storage
Expedited energy charging of water using natural graphite flake for cool thermal storage
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DOI：
10.1080/1536383x.2021.1879056
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发表时间：
2021-02
期刊：
影响因子：
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通讯作者：
V. Kumaresan;K. S. Raghavan;M. Vikram;J. Iyyappan
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文献类型：
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作者：
V. Kumaresan;K. S. Raghavan;M. Vikram;J. Iyyappan
摘要本文研究了分散有天然石墨薄片（NGF）的去离子水在直径为64 mm和52 mm的两种球形胶囊中的凝固特性，这种天然石墨薄片被称为微粒增强相变材料（MePCM）。去离子水的异质成核因子从0.0531降低到0.0001，这是由于添加NGF后接触角减小。热导率结果显示，在MePCM中，具有5wt. %，并且增强与NGF质量分数的增加不成比例。去离子水中NGF的存在消除了过冷并加快了凝固速率。与两个胶囊中的基础PCM相比，MePCM在更短的时间内存储了近94%的冷能。总之，NGF可以是一种有前途的热增强剂，以可负担的成本大规模制备用于冷热能储存应用的MePCM。
Abstract This study investigates the solidification characteristics of deionized water dispersed with natural graphite flakes (NGF), called micro-particle enhanced phase change material (MePCM), in two spherical capsules of ‘64 mm’ and ‘52 mm’ diameter. Heterogeneous nucleation factor of deionized water reduces from 0.0531 to 0.0001 due to reduction in contact angle with addition of NGF. Thermal conductivity results show an enhancement of 25% in the MePCMs with 5 wt. % over the base PCM and the enhancement is not proportional to increase in mass fraction of NGF. The presence of NGF in deionized water eliminates the subcooling and expedites the solidification rate. The MePCM stores almost 94% of cool energy in a shortened duration compared to the base PCM in both capsules. In summary, the NGF can be a promising thermal enhancer to prepare the MePCMs in large scale at an affordable cost for the cool thermal energy storage applications.