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Melting characteristics of a longitudinally finned-tube horizontal latent heat thermal energy storage system

Citation

Modi, N and Wang, X and Negnevitsky, M and Cao, F, Melting characteristics of a longitudinally finned-tube horizontal latent heat thermal energy storage system, Solar Energy, 230 pp. 333-344. ISSN 0038-092X (2021) [Refereed Article]

Copyright Statement

2021 International Solar Energy Society. Published by Elsevier Ltd. All rights reserved.

DOI: doi:10.1016/j.solener.2021.10.043

Abstract

This study aims to analyze the effect of fin geometry on the thermal performance of longitudinally finned-tube horizontal latent heat thermal energy storage (LHTES) systems. The longitudinal fins with different fin heights, thickness, and numbers were applied in the horizontal shell-and-tube LHTES system and the paraffin was packed in the annulus. The melting fronts, average temperature, and velocity profiles of Phase Change Material (PCM) were graphically illustrated and compared for charging processes. It was found that the incorporation of longitudinal fins in a small quantity (2.85% of total volume) could reduce the complete melting time by 34% in comparison to the bare-tube configuration. Melting characteristics were compared using average liquid fraction, average PCM temperature, and stored energy. It was recommended that the fin height should not exceed half of the annulus gap. The optimum fin volume was identified by comparing the enhancement ratio for examined configurations. Furthermore, for the same fin volume configurations, this study evaluated (i) whether a large number of short fins are beneficial or a smaller number of long fins and (ii) whether thick short fins are beneficial or thin long fins? Comparison results showed that a small number of long fins were more beneficial than that of more short fins and the melting characteristics of thin long fins were superior to that of the thick short fins. Finally, the optimum fin configuration was justified, and the priority sequence was suggested for the design of longitudinally finned-tube energy storage systems.

Item Details

Item Type:Refereed Article
Keywords:longitudinal fins, phase change material, natural convection, latent heat thermal energy storage, melting
Research Division:Engineering
Research Group:Mechanical engineering
Research Field:Energy generation, conversion and storage (excl. chemical and electrical)
Objective Division:Energy
Objective Group:Energy storage, distribution and supply
Objective Field:Energy storage (excl. hydrogen and batteries)
UTAS Author:Modi, N (Mr Nishant Modi)
UTAS Author:Wang, X (Professor Xiaolin Wang)
UTAS Author:Negnevitsky, M (Professor Michael Negnevitsky)
ID Code:147253
Year Published:2021
Deposited By:Engineering
Deposited On:2021-10-20
Last Modified:2021-11-05
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