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Abstract

The shell-and-tube latent heat thermal energy storage (LHTES) system has been widely studied. In thispaper, the effect of geometric design on vertical shell and tube LHTES systems is investigated.Accordingly, cylindrical and conically shaped experimental tests are developed for this purpose. The thermalperformance of the conical and cylindrical systems is compared experimentally and theoretically.The temporal variation of the experimental temperature is used to validate the mathematical modeland demonstrate the effects of natural convection on heat transfer in the phase change material (PCM)during the charging and discharging processes of both systems. The melting/solidification time, liquidfraction, and stored/released energy are used to evaluate the performance of the two systems. The resultsshow that the conical system can store thermal energy much faster than the cylindrical system at thesame operating condition at a specific charging time before the system is fully charged. This is enabledsince the conical design allows natural convection to dominate in a large volume of PCM at top of the container.However, there is no significant difference during the discharging process. The results indicatethat the natural convection effect can be advantageously utilized by optimization of the design of theshell-and-tube LHTES system.

Item Type:	Article
Authors/Creators:	Seddegh, S and Tehrani, SSM and Wang, X and Cao, F and Taylor, RA
Keywords:	latent heat thermal energy storage, phase change materials, natural convection, shell and tube, conical geometry
Journal or Publication Title:	Applied Thermal Engineering
Publisher:	Pergamon-Elsevier Science Ltd
ISSN:	1359-4311
DOI / ID Number:	https://doi.org/10.1016/j.applthermaleng.2017.11.130
Copyright Information:	Copyright 2017 Elsevier Ltd.
Related URLs:	Google Scholar: Wang, X UTAS Profile: Wang, X
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