Investigation of the effect of eccentricity and shell diameter on the charging performance of erythritol for thermal energy storage

IF 6.4 2区工程技术 Q1 THERMODYNAMICS Case Studies in Thermal Engineering Pub Date : 2024-12-15 DOI:10.1016/j.csite.2024.105648

Amr Rabiea, Taher Halawa

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Abstract

This study investigates the effect of changing eccentricity and shell diameter on the charging performance of latent heat thermal energy storage systems (LHTES). A three-dimensional numerical model was developed to simulate the melting process of erythritol as a phase change material (PCM) in a horizontal double pipe heat exchanger. The results demonstrate that increasing eccentricity significantly enhances charging performance, with optimal relative eccentricity values between 0.6 and 0.7 across various shell diameters. Under optimal conditions, all shell diameters showed at least a 32 % improvement in charging efficiency, reducing charging time by a minimum of approximately 4 h. Larger shell diameters showed greater sensitivity to eccentricity changes, with charging time reductions up to 43 % for a 133 mm shell. The study also reveals that eccentricity promotes more uniform temperature profiles and accelerates the charging process by enhancing natural convection. These findings provide valuable insights for optimizing latent heat thermal energy storage designs, particularly for larger-scale applications.

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本研究探讨了改变偏心率和壳体直径对潜热蓄热系统（LHTES）充能性能的影响。研究人员开发了一个三维数值模型，用于模拟水平双管热交换器中作为相变材料（PCM）的赤藓糖醇的熔化过程。结果表明，增加偏心率可显著提高充注性能，各种壳体直径的最佳相对偏心率值介于 0.6 和 0.7 之间。在最佳条件下，所有直径的壳体都至少提高了 32% 的装料效率，至少缩短了约 4 小时的装料时间。较大直径的壳体对偏心率变化的敏感性更高，133 毫米壳体的装料时间最多可缩短 43%。研究还表明，偏心能促进更均匀的温度分布，并通过加强自然对流来加速装料过程。这些发现为优化潜热热能存储设计，尤其是大规模应用提供了宝贵的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.