Abstract
• A new model named phase change heat-porous medium which is suitable for composite melting is established. • The evolution of liquid phase ratio with temperature is determined by experiments. • The accuracy of the model is verified by the visualization experiment. The model can effectively predict the solid-liquid phase transition of composite PCM. Phase change materials are widely used in the field of energy storage. Phase change materials for energy storage are mostly composite materials. There is no fixed phase transition temperature, but a phase transition temperature zone. How to describe the melting characteristics of composites in the temperature range of transformation is a key. This paper summarizes the problems of various models in the field of solid-liquid phase transition. The relationship between the latent heat and liquid phase ratio with temperature is determined. Based on the traditional enthalpy-porous medium model, a phase change heat-porous medium model suitable for composite melting is established. The correctness of the model is verified by visual experiment. This model fully considers the non-linear relationship between the latent heat, the liquid phase ratio and the transformation temperature, and can describe the melting behavior of composite phase change materials more accurately.
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