Highly stable phase change materials with superior thermal properties and reliability are of utmost need for waste heat recovery applications. Due to low supercooling, non-corrosivity, and low phase separation, organic phase change materials are preferred for thermal energy storage over inorganic phase change materials. Despite their other advantages, the limited heat conductivity of organic phase change materials limits their practical use in thermal energy storage. Therefore, current research focuses on developing nano-enhanced organic phase change materials by dispersing one-dimensional thread-shaped multi-wall carbon nanotubes with different weight percentages to improve the thermal properties of the base PEG-1000 PCM. The two-step method was adopted to develop phase change material composites to establish an improved thermal network, resulting in improved thermal conductivity. An ongoing study evaluated structural stability, chemical stability, thermal property, optical absorptivity, transmissivity, and thermal reliability of the formulated nano-enhanced phase change material composites. The results demonstrated that the highest thermal conductivity of nanocomposite was improved by 104.2 % at 0.7 wt% multiwall carbon nanotube. The composite's optimum latent heat and melting point were 41.5 °C & 140 J/g, respectively. Additionally, the composite retained its thermal and chemical performance after being subjected to 500 thermal cyclic studies. Subsequently, a heat transfer simulation study is conducted to exhibit the effect of higher thermal conductivity of newly formulated nanocomposites for heat transfer compared to base PCM using 2-D energy simulation software.

中文翻译：

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利用多壁碳纳米管注入聚乙二醇复合材料优化热能储存的实验和仿真研究


具有卓越热性能和可靠性的高稳定性相变材料是余热回收应用最需要的。由于有机相变材料具有低过冷度、无腐蚀性和低相分离性，因此与无机相变材料相比，有机相变材料更适合用于热能存储。尽管有机相变材料具有其他优点，但其有限的导热性限制了它们在热能存储中的实际应用。因此，目前的研究重点是通过分散不同重量百分比的一维线状多壁碳纳米管来开发纳米增强的有机相变材料，以改善基础 PEG-1000 PCM 的热性能。采用两步法开发相变材料复合材料，以建立改进的热网络，从而提高热导率。一项正在进行的研究评估了配制的纳米增强相变材料复合材料的结构稳定性、化学稳定性、热性能、光学吸收率、透射率和热可靠性。结果表明，在 0.7 wt% 多壁碳纳米管中，纳米复合材料的最高热导率提高了 104.2%。复合材料的最佳潜热和熔点分别为 41.5 °C 和 140 J/g。此外，该复合材料在经过 500 次热循环研究后仍保持了其热和化学性能。随后，进行了一项传热模拟研究，以展示与 2-D 能量模拟软件的基础 PCM 相比，新配制的纳米复合材料对传热具有更高的导热性的影响。