Study on heat transfer of pile foundation ground heat exchanger with three-dimensional groundwater seepage

This paper presents a new mathematical model about the heat transfer of energy pile with 3-D groundwater seepage, whereby the analytical temperature responses solutions induced by both infinite and finite models are obtained. Comparisons between pure conduction and combined heat transfer were made, and the temperature distributions in a 3-D seepage environment are explained. In addition, the characteristics involved in the new model were explored and then the factors exerting influence on heat transfer are described. The 3-D groundwater seepage is more advanced and realistic, and the research described in this paper is usefully relevant to promoting the development of energy piles of GSHP.