Abstract
The present study deals with the characteristics of the heat storage vessel packed with rectangular phase change materials by numerical analysis. The latent heat storage materials in the vessel are heated by utilizing the natural convection of the heat transfer medium, which flow the interval of the latent heat storage materials. The interval of rectangular latent heat storage materials is greatly related to natural convection of the heat transfer medium. Numerical results revealed temperature profiles and flow patterns of the heat transfer medium affected the heat storage characteristics.