HEAT-TRANSFER CHARACTERISTICS OF COOL-THERMAL STORAGE-SYSTEMS

Authors
RYU, HWHONG, SASHIN, BCKIM, SD
Issue Date
1991-04
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ENERGY, v.16, no.4, pp.727 - 737
Abstract
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.
Keywords
LATENT; LATENT
ISSN
0360-5442
URI
https://pubs.kist.re.kr/handle/201004/146822
DOI
10.1016/0360-5442(91)90022-E
Appears in Collections:
KIST Article > Others
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