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Role of extended fins and graphene nano-platelets in coupled thermal enhancement of latent heat storage system

机译：延长翅片和石墨烯纳米血小板在潜热储存系统耦合热增强中的作用

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摘要

To bring modernisation in low carbon economy, the latent heat storage (LHS) systems are crucial for sustainable future of smart energy generation and management systems for renewable sources. This article provides in-depth numerical analyses of 3-dimensional computational models incorporating coupled thermal enhancement techniques for identifying optimal solution to guarantee higher charging rate, higher total enthalpy and better thermal distribution of LHS system. Paraffin is selected as phase change material (PCM), graphene nano-platelets (GNP) as nano-additives and longitudinal, circular and wire-wound fins as extended surfaces in vertical shell-and-tube configurations. Based on numerical analyses, the extended surfaces have registered better thermal distributions and charging rates as compared to nano-PCMs. The geometrical orientation of extended surfaces and volume concentration of nano-additives have significant influence on melt front movement, natural convection and heat transfer performance. The peak values of heat fluxes are significantly increased from 2.25 kW/m(2) for paraffin without thermal enhancement to 35.86, 47.23 and 88.13 kW/m(2) for nano-PCM with 1% GNP in circular, longitudinal and wire-wound fins configurations. Hence, the charging duration for capturing 11.09 MJ is significantly reduced to mere 1.02 h for wire-wound fins configuration as compared to 23.5 h for paraffin without thermal enhancement. Likewise, the charging rate of wire-wound fins configuration is 20.95%, 35.96% and 89.94% higher than circular fins, longitudinal fins and nano-PCMs without extended surfaces, respectively. The increase in volume concentration from 1% to 5% has exhibited adverse implications on accumulative enthalpy, natural convection and charging rate. Therefore, the novel design of coupled enhancement with wire-wound fins configuration and nano-PCM with 1% GNP are established as optimum solution for potential wide-ranging practical utilisations of LHS system.
机译：为了在低碳经济中带来现代化，潜热存储（LHS）系统对于可再生能源智能能源生成和管理系统的可持续未来至关重要。本文提供了具有耦合热增强技术的三维计算模型的深入数值分析，用于识别最佳解决方案，以保证更高的充电率，更高的LHS系统的总焓和更好的热分布。将石蜡选择为相变材料（PCM），石墨烯纳米血小板（GNP），作为纳米添加剂和纵向，圆形和线缠绕翅片，如垂直壳管结构中的延伸表面。基于数值分析，与纳米PCM相比，扩展表面具有更好的热分布和充电率。纳米添加剂的延长表面和体积浓度的几何取向对熔体前运动，自然对流和传热性能产生了显着影响。用于石蜡的2.25kW / m（2）的热通量的峰值显着增加，对于35.86,47.23和88.13 kW / m（2），用于圆形，纵向和绕线，纵向和绕线型纳米PCM的35.86,47.23和88.13 kW / m（2）鳍配置。因此，对于导线翅片构型，捕获11.09mJ的充电持续时间显着减少到Mere 1.02h，而没有热增强，但对于石蜡23.5小时而言。同样地，线缠绕翅片配置的充电率分别高于圆形翅片，纵向翅片和纳米PCM的20.95％，35.96％和89.94％，没有延伸表面。体积浓度的增加从1％到5％表现出对累积焓，自然对流和充电率的不利影响。因此，建立了具有1％GNP的线缠绕翅片构型和纳米PCM的耦合增强的新颖设计作为LHS系统的潜在广泛实际利用的最佳解决方案。

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