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首页> 外文期刊>Journal of Materials Engineering and Performance >Cooling Curve Analysis of Micro- and Nanographite Particle-Embedded Salt-PCMs for Thermal Energy Storage Applications
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Cooling Curve Analysis of Micro- and Nanographite Particle-Embedded Salt-PCMs for Thermal Energy Storage Applications

机译：用于热能存储应用的微型和纳米粒子嵌入盐PCM的冷却曲线分析

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摘要

In recent years, the focus of phase change materials (PCM) research was on the development of salt mixtures with particle additives to improve their thermal energy storage (TES) functionalities. The effect of addition of microsized (50 mu m) and nanosized (400 nm) graphite particles on TES parameters of potassium nitrate was analyzed in this work. A novel technique of computer-aided cooling curve analysis was employed here to study the suitability of large inhomogeneous PCM samples. The addition of graphite micro- and nanoparticles reduced the solidification time of the PCM significantly enhancing the heat removal rates, in the first thermal cycle. The benefits of dispersing nanoparticles diminished in successive 10 thermal cycles, and its performance was comparable to the microparticle-embedded PCM thereafter. The decay of TES functionalities on thermal cycling is attributed to the agglomeration of nanoparticles which was observed in SEM images. The thermal diffusivity property of the PCM decreased with addition of graphite particles. With no considerable change in the cooling rates and a simultaneous decrease in thermal diffusivity, it is concluded that the addition of graphite particles increased the specific heat capacity of the PCM. It is also suggested that the additive concentration should not be greater than 0.1% by weight of the PCM sample.
机译：近年来，相变材料（PCM）的研究重点是开发含颗粒添加剂的盐混合物，以改善其储能功能。本文分析了添加微米（50μm）和纳米（400 nm）石墨颗粒对硝酸钾TES参数的影响。本文采用了一种新的计算机辅助冷却曲线分析技术来研究大型非均匀PCM样品的适用性。在第一个热循环中，添加石墨微粒和纳米颗粒可缩短PCM的凝固时间，显著提高散热率。在连续10次热循环中，分散纳米颗粒的好处减少了，其性能与随后嵌入的微粒PCM相当。TES功能在热循环中的衰减归因于SEM图像中观察到的纳米粒子团聚。随着石墨颗粒的加入，相变材料的热扩散性能降低。在冷却速率没有显著变化且热扩散率同时降低的情况下，可以得出结论，添加石墨颗粒会增加PCM的比热容。还建议添加剂浓度不应大于PCM样品重量的0.1%。

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