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首页> 外文期刊>International Journal of Thermal Sciences >Semi-analytical thermal modeling of transverse and longitudinal fins in a cylindrical phase change energy storage system
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Semi-analytical thermal modeling of transverse and longitudinal fins in a cylindrical phase change energy storage system

机译：圆柱形相变能储存系统中横向和纵向翅片的半分析热建模

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摘要

Inclusion of fins in phase change energy storage systems has been widely investigated for improving the rate of energy storage. Despite significant past experimental research in this direction, there is a lack of comprehensive theoretical models for fin-based enhancement in energy storage, particularly for cylindrical geometries. This is a considerably challenging, non-linear problem. This paper presents a semi-analytical model for temperature distribution and energy storage in an annular phase change material (PCM) material around a hot cylinder in the presence of transverse and longitudinal fins extending into the PCM. Two distinct pathways for heat transfer into the PCM are analyzed separately and expressions for total heat flux into the PCM are determined for both fin types. The perturbation method is used for analyzing the non-linear phase change problem and determining the heat flux into the PCM through the fin. The dependence of total energy stored on fin thermal properties and geometrical parameters is determined. Results indicate key similarities and differences between cylindrical fins and recently-reported Cartesian fins. It is shown that even a thin fin results in considerable heat transfer enhancement. Results also indicate diminishing results when the fin size is further increased. Theoretical modeling presented in this paper improves the fundamental understanding of an important heat transfer enhancement strategy for phase change based energy storage systems. Results discussed here may help improve the practical design of finned, cylindrical phase change energy storage systems that are commonly used for harnessing renewable energy.
机译：在相变能量储存系统中包含翅片已被广泛研究，以提高能量储存速率。尽管朝着这种方向进行了大量的实验研究，但缺乏储能的鳍增强的综合理论模型，特别是对于圆柱形几何形状。这是一个很大的挑战性，非线性问题。本文介绍了在横向和纵向翅片的热圆筒上延伸到PCM的横向和纵向翅片的环形相变材料（PCM）材料中的温度分布和能量存储的半分析模型。分别分别分别分析用于传热进入PCM的两种不同的途径，并确定两种鳍片类型的总热通量的表达。扰动方法用于分析非线性相变问题，并通过翅片将热通量确定为PCM。确定了存储在翅片热性质和几何参数上的总能量的依赖性。结果表明圆柱形翅片与最近报告的笛卡尔翅片之间的关键相似性和差异。结果表明，即使是薄翅片也导致相当大的传热增强。结果还表明当鳍片尺寸进一步增加时，结果递减。本文提出的理论建模改善了对基于相变能储存系统的重要传热增强策略的根本理解。这里讨论的结果可以有助于改善通常用于利用可再生能源的翅片，圆柱相变能量存储系统的实际设计。

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