Heat transfer characteristics of cool-thermal storage systems

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The heat-transfer characteristics of cool-thermal storage units during the charging period were studied with 2 wt% of sodium sulfate decahydrate in aqueous solution as the phase-change material. Vertical and horizontal tube systems were compared with respect to heat-transfer rate, coefficient of performance and supercooling of the phase-change material. It was found that crystals of the phase-change material grow into concentric circles in the horizontal tubes whereas they grow into convex circles in the vertical tubes. The crystal-growth patterns for the vertical tube systems are caused by the thermocline of the heat-transfer fluid surrounding the tubes. As a result, the vertical-tube system has better thermal performance than the horizontal-tube system. The total amounts of stored energy were correlated in terms of the Fourier, Stefan, and Reynolds numbers to provide basic data for designing tube types of cool-thermal-energy-storage systems.
Publisher
Pergamon-Elsevier Science Ltd
Issue Date
1991-04
Language
English
Article Type
Article
Keywords

LATENT

Citation

ENERGY, v.16, no.4, pp.727 - 737

ISSN
0360-5442
DOI
10.1016/0360-5442(91)90022-E
URI
http://hdl.handle.net/10203/4160
Appears in Collection
CBE-Journal Papers(저널논문)
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