The phase transitions modeling in encapsulated thermal storage materials

Abstract

This article describes the method of designing the phase change processes of heat storage materials in capsules of different forms with a solid heat-conducting shell. The basis of the method is heat conductivity equation that is applied for one-dimensional nonstationary temperature area with internal heat sources. This equation is written for a fixed grid of the phase transition zones allocation and is proposed by the authors. Paraffin-n-octadecane was considered as heat storage material. The profiles of temperature during melting of a spherical capsule at different times, the profiles of the phase transition front at different values of heat transfer coefficient are shown.