Heat Transfer Performance of Phase Change Heat Storage with Helical Coil Structure

In view of the fact that solar energy is difficult to match the heating requirements of architecture, the phase change heat storage with helical coil structure is designed, in which paraffin is chosen as phase change medium. The heat performance of the storage unit under four different kinds of operation conditions is researched by experiment. By analyzing the moving law of phase change interface in the melting process of phase change medium, the optimized design of heat accumulator is proposed. A fitting formula is also obtained by introducing non-dimensional parameters to provide the foundations for engineering application.