Thermal Analysis of 2D Phase-Change Energy Pile Based on Multi-Scale Wavelet Decomposition

Abstract This study concentrates on the thermal characteristics of 2D phase - change energy piles. Using multi - scale wavelet decomposition and Gibbs entropy analysis, it compares two energy pile scenarios with different filling materials and structures. The findings reveal that in Scenario B, the energy pile with stepped phase - change materials shows superior stability and sustainability in macro - temperature field changes, and temperature field structure complexity. These results offer a scientific foundation for optimizing energy pile design and ensuring their long - term stable operation.