Accurate solution and approximate integral methods were applied to study the heat transfer properties of a kind of phase-change material developed in this study which contained in a slab enclosure during solidification. The movement of phase-change interface

the heat flux rate of the boundary

and the relationship of the thickness of slab and the predicted time of solidification under different cooling conditions were obtained. The calculated results seem to be in good agreement with the experimental values. It is found that the thicker of the solid

the smaller the heat flux rate; the lower the temperature of the cooling liquid and the thinner of the slab

the shorter the cool charging time.