Research on optimization of annular fin phase change heat storage device based on orthogonal test

This study investigates the impact of structural parameters on the heat storage capacity of an annular fin phase change heat storage device. Utilizing a quadratic regression orthogonal experiment combined with numerical simulation, a reliable regression equation was developed to optimize the structural parameters of the heat storage device. The performance of heat storage and release characteristics under optimal structural conditions was further explored by varying operating parameters. The results demonstrate that the radius of the steam pipe, fin thickness, and fin length significantly impact the heat storage capacity, and an optimal set of structural parameters exists that maximizes heat storage. During the heat storage process, increasing the steam mass-flow rate and inlet temperature accelerates the melting of phase change material, reducing the complete melting time and enhancing the heat storage rate. Conversely, in the heat release process, an increase in steam mass-flow rate and a reduction in inlet temperature expedite the solidification of phase change material.