An approach for heat transfer thermal analysis of a pre-stressed high-strength concrete (PHC) energy pile

This paper presents a new heat transfer analytical model for pre-stressed high-strength concrete (PHC) energy piles. This model can describe the temperature field distribution in the heat transfer space formed by PHC energy piles and the surrounding soil. The heat transfer control equation was derived based on the energy conservation principle, and the analytical model was solved through Laplace transformation. Subsequently, the model's accuracy was verified by comparing it with both field test results and numerical simulation results. Furthermore, the model was utilized to conduct relevant parameter analysis. The result shows that compared with other heat transfer analytical models, the PHC energy pile heat transfer model proposed in this paper is more accurate than the existing models. Furthermore, different backfill materials for the PHC energy pile show differences in heat transfer within the pile and soil. Compared to altering the pipe pile's thermal properties, changing the backfill materials used for the PHC energy pile has a more significant impact on heat transfer.