桩基螺旋管换热器传热性能的数值模拟

three-dimensional numerical analysis model of pile foundation ground heat exchanger with spiral coils was established in this paper. Through comparing with the results between numerical simulation and empirical correlations ,the validity of the model have been proved .This paper also explored the effect on the heat transfer performance of the pile foundation ground heat exchanger with spiral coils by adjusting the velocity, pitch and the soil thermal physical properties. Some useful conclusions have been drawn for the real application of design for pile spiral pipe heat exchanger.As a result, higher soil thermal conductivity is more suitable for Chongqing to generalize pile foundation ground heat exchanger with spiral coils.And the design velocity and pitch can not too high.