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A critical review on heat transfer augmentation of phase change materials embedded with porous materials/foams

机译：关于埋有多孔材料/泡沫的相变材料传热增强的重要评论

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摘要

Phase change material (PCM) is promising media for thermal energy storage owing to its extensive value of latent heat (140-970 KJ/Kg). However, thermal conductivity of PCMs is too low which obstructs energy storage and retrieval rate. In recent days, thermally enhanced PCMs are considered promising materials for efficient heat transfer in many applications. This article designates the review on improved thermal properties and heat transfer of PCMs by using porous materials. Enhanced heat transfer of PCMs can be achieved using extended surfaces (triangular, conical, square, and rectangular fins), heat pipes, and addition of highly conductive nanoparticles (e.g. Cu, Al2O3, Au, SiC, SiO2 and TiO2). Major focus of this article is to study the enhanced heat transfer of PCMs through metallic (copper, nickel, and aluminum) and carbon based (carbon, graphite and expanded graphite) porous materials/foams. Effects of porosity and pore density on heat transfer, thermal conductivity, specific heat, latent heat and charging/discharging time are critically reviewed. Porous materials/foams are reported to be efficient for heat transfer/thermal conductivity enhancement by 3-500 times. Furthermore, correlations to find the effective thermal conductivity of PCM/foam are reported. Important applications of PCM/foam reported by different researchers are also discussed in this paper. Finally, conclusions and recommendations are presented to highlight the research gap in this area. (C) 2019 Elsevier Ltd. All rights reserved.
机译：相变材料（PCM）的潜热值很高（140-970 KJ / Kg），是用于热能存储的有前途的介质。然而，PCM的导热率太低，这阻碍了能量存储和回收率。近年来，热增强的PCM被认为是在许多应用中用于有效传热的有前途的材料。本文指定了通过使用多孔材料改善PCM的热性能和传热的综述。使用扩展的表面（三角形，圆锥形，正方形和矩形的散热片），热管以及添加高导电性的纳米颗粒（例如Cu，Al2O3，Au，SiC，SiO2和TiO2），可以增强PCM的传热性能。本文的主要重点是研究通过金属（铜，镍和铝）和碳基（碳，石墨和膨胀石墨）多孔材料/泡沫增强的PCM传热。严格审查了孔隙度和孔隙密度对传热，导热系数，比热，潜热和充放电时间的影响。据报道，多孔材料/泡沫对于传热/导热率提高了3-500倍。此外，报告了发现PCM /泡沫的有效导热率的相关性。本文还讨论了不同研究人员报道的PCM /泡沫的重要应用。最后，提出结论和建议，以突出该领域的研究差距。 （C）2019 Elsevier Ltd.保留所有权利。

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