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HEAT TRANSFER CHARACTERISTICS IN LOW-TEMPERATURE LATENT HEAT STORAGE SYSTEMS USING SALT HYDRATES

Choi JC Kim SD Han GY

Korean Journal of Chemical Engineering, April 1995, 12(2), 258-263(6), 10.1007/BF02705655

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Abstract

Heat transfer characteristics of a low temperature latent heat storage system have been determined for the circular finned and unfinned tubes using sodium acetate trihydrate as a phase change material(PCM). In the heat storage stage (melting process), the PCM heat transfer coefficient in the unfinned-tube system showed good agreement with the calculated value by the heat conduction equation. The heat transfer between the tube wall and the PCM was not enhanced by the fins in the thin-finned-tube system, whereas 2 times higher heat-transfer coefficient for the thick-finned-tube system over the unfinned-tube and thick-finned-tube systems are in the ranges of 40-170 and 80-320 W/m²-k, respectively. The amount of heat storage for three systems has been correlated in terms of Fourier, Stefan and Reynolds numbers. The thermal performance of heat storage systems are found to be strongly dependent on the inlet temperature of heat transfer fluid.

Keywords

Thermal Storage Systems Phase Change Material (PCM) Heat Transfer Coefficients Supercooling Phase Separation Unfinned-tube System Thick Finned-tube System

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