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Abstract

This study aims to investigate the optimal shell-to-tube radius ratio in a vertical shell-and-tube latent heat thermal energy storage system with phase change material packed in the annulus and heat transfer fluid circulating in the central tube. A conjugate thermodynamic model is developed and validated, and then applied to investigate two series of system configurations: varying the phase change material shell radius at a fixed heat transfer fluid tube radius and varying the heat transfer fluid tube radius at a fixed shell radius. The numerical investigation compares and evaluates energy storage/retrieval density, energy storage/retrieval rate, and total stored/retrieved energy capacity under different shell-to-tube radius ratios. The results show that the thermal behaviour in both series of units is very similar. The optimal radius ratio slightly increases as the total charging/discharging time increases. The unit height has a gentle effect on the optimal radius ratio in the charging process and a negligible influence in the discharging process. By balancing the energy storage/retrieval density, energy storage/retrieval rate, and storage/retrieval capacity in both charging and discharging processes, the optimal shell-to-tube radius ratio is found to be around 5 for both series of configurations at the studied total charging/discharging times.

Item Type:	Article
Authors/Creators:	Shen, G and Wang, X and Chan, A and Cao, F and Yin, X
Keywords:	latent heat energy storage, shell-and-tube heat exchanger, thermal performance, energy storage density
Journal or Publication Title:	Solar Energy
Publisher:	Pergamon-Elsevier Science Ltd
ISSN:	0038-092X
DOI / ID Number:	10.1016/j.solener.2020.10.003
Copyright Information:	Copyright 2020 International Solar Energy Society
Related URLs:	Google Scholar: Wang, X UTAS Profile: Wang, X Google Scholar: Chan, A UTAS Profile: Chan, A
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