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首页> 外文期刊>Energy Conversion & Management >Parametric investigations to enhance thermal performance of paraffin through a novel geometrical configuration of shell and tube latent thermal storage system
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Parametric investigations to enhance thermal performance of paraffin through a novel geometrical configuration of shell and tube latent thermal storage system

机译：通过壳和管潜热存储系统的新型几何构型来提高石蜡热性能的参数研究

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This paper presents a two-dimensional finite element computational model which investigates thermal behaviour of a novel geometrical configuration of shell and tube based latent heat storage (LHS) system. Commercial grade paraffin is used as a phase change material (PCM) with water is employed as a heat transfer fluid (HTF). In this numerical analysis, the parametric investigations are conducted to identify the enhancement in melting rate and thermal storage capacity. The parametric investigations are comprised of number and orientation of tube passes in the shell, longitudinal fins length and thickness, materials for shell, tube and fins, and inlet temperature of HTF. Numerical analysis revealed that the melting rate is significantly enhanced by increasing the number of tube passes from 9 to 21. In 21 passes configuration, conduction heat transfer is the dominant and effective mode of heat transfer. The length of fins has profound impact on melting rate as compared to fins thickness. Also, the reduction in thermal storage capacity due to an increase in fins length is minimal to that of increase in fins thickness. The influence of several materials for shell, tube and fins are examined. Due to higher thermal conductivity, the melting rate for copper and aluminium is significantly higher than steel AISI 4340, cast iron, tin and nickel. Similarly, the thermal storage capacity and melting rate of LHS system is increased by a fraction of 18.06% and 68.8% as the inlet temperature of HTF is increased from 323.15 K to 343.15 K, respectively. This study presents an insight into how to augment the thermal behaviour of paraffin based LHS system and ultimately, these findings inform novel design solutions for wide-ranging practical utilisation in both domestic and commercial heat storage applications. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本文提出了一个二维有限元计算模型，该模型研究了基于壳管式潜热存储（LHS）系统的新型几何结构的热行为。商业级石蜡用作相变材料（PCM），而水用作传热流体（HTF）。在此数值分析中，进行了参数研究，以确定熔化速率和储热能力的提高。参数研究包括壳体中管段的数量和方向，纵向翅片的长度和厚度，壳体，管和翅片的材料以及HTF的入口温度。数值分析表明，通过将通道数从9增加到21，可以显着提高熔化速率。在21通道配置中，传导传热是主要的有效传热方式。与鳍片的厚度相比，鳍片的长度对熔化速率有深远的影响。另外，由于翅片长度的增加而导致的蓄热能力的降低与翅片厚度的增加相比是最小的。研究了几种材料对壳，管和鳍的影响。由于较高的热导率，铜和铝的熔化速率明显高于AISI 4340钢，铸铁，锡和镍。同样，随着HTF入口温度分别从323.15 K增加到343.15 K，LHS系统的储热容量和熔化速率分别提高了18.06％和68.8％。这项研究提出了关于如何增强基于石蜡的LHS系统的热行为的见解，最终，这些发现为新颖的设计解决方案提供了参考，可广泛应用于家庭和商业储热应用中。 （C）2016 Elsevier Ltd.保留所有权利。

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