Most phase change materials have the problem of supercooling

which affects the wide use of phase change materials.Therefore

it is very important to figure out the temperature variations during the solidifying process of phase change material.The numerical model of step cooling process of phase change material was built based on the lumped parameter method and the effective heat capacity method

and the model was verified by the experimental results.Meanwhile

the influences of the supercooling degree and the amount of latent heat of the phase change material on its temperature during the solidifying process were studied.It was found that the starting solidifying time of the phase change material and the total time of solidifying process both had the exponential relationship with the supercooling degree.The starting solidifying time was delayed with the increase of the supercooling degree

and the total time of solidifying process was decreased with the increase of the supercooling degree.The amount of latent heat had no influence on the starting solidifying time

but there was a linear relationship between the amount of latent heat and the total time of solidifying process.