RYU, HW HONG, SA SHIN, BC KIM, SD 2024-01-21T23:46:07Z 2024-01-21T23:46:07Z 2021-09-02 1991-04 0360-5442 https://pubs.kist.re.kr/handle/201004/146822 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. English PERGAMON-ELSEVIER SCIENCE LTD LATENT HEAT-TRANSFER CHARACTERISTICS OF COOL-THERMAL STORAGE-SYSTEMS Article 10.1016/0360-5442(91)90022-E 1 ENERGY, v.16, no.4, pp.727 - 737 ENERGY 16 4 727 737 scie scopus A1991EZ89200005 2-s2.0-0026150014 Thermodynamics Energy & Fuels Thermodynamics Energy & Fuels Article LATENT