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

Modi, N, Wang, X ORCID: 0000-0003-4293-7523, Negnevitsky, M ORCID: 0000-0002-5130-419X and Cao, F 2021 , 'Melting characteristics of a longitudinally finned-tube horizontal latent heat thermal energy storage system' , Solar Energy, vol. 230 , pp. 333-344 , doi: 10.1016/j.solener.2021.10.043.

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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 Type: Article
Authors/Creators:Modi, N and Wang, X and Negnevitsky, M and Cao, F
Keywords: longitudinal fins, phase change material, natural convection, latent heat thermal energy storage, melting
Journal or Publication Title: Solar Energy
Publisher: Pergamon-Elsevier Science Ltd
ISSN: 0038-092X
DOI / ID Number: 10.1016/j.solener.2021.10.043
Copyright Information:

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

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