| 總結: | A numerical method based on the effective heat capacity method was studied to solve the
phase change heat transfer problems of a phase change material in a cylindrical latent heat
thermal energy storage device during the charging (melting) process of the material. The
commercial software COMSOL Multiphysics was employed to run the numerical
simulations. The effective heat capacity method was used to characterize the fusion heat of
melting of the phase change material and the moving boundary of solid-liquid interface. An
analytical tool was used to validate the phase change heat transfer process in which the
results show a good agreement between the numerical and analytical analysis.
Subsequently, the effects of fins and various heat transfer velocities on the thermal behavior
of the PCM were studied numerically using the software. Generally, the results obtained
from the analysis show that the heat transfer rate increases as the number of fins and HTF
velocities were increased. For small number of fins configurations, the effect of increasing
the HTF velocities are not so significant, as the thermal resistance of the phase change
material is high. However, the effect is more evident as the number of fins increases; due to
the decreasing thermal resistance on the PCM side.
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