The truncated cone helix energy pile (CoHEP) is a new type of environmentally-friendly and cost-effective ground heat exchanger with a strong heat transfer capacity. However, its heat transfer characteristics, especially thermal interference, have not yet been fully interpreted due to its complex geometry and semi-infinite medium. In order to understand the thermal interference in the radial and generatrix directions, an efficient modeling method that regards a spiral pipe as a series of ring coils was proposed in this paper based on their structural characteristics and makes these ring coils equivalent to heat sources that are based on heat transfer in the pipe. The thermal interference index based on the temperatures at typical locations was defined to describe the thermal interference of CoHEP. And the accuracy and high efficiency of equivalent heat source modeling method was verified by field experiments. Finally, the CoHEPs of cylindrical energy pile at a cone angle of 0°, 5°, 10°, 15° and 20° were numerically simulated. The results show that the thermal interference intensity decreased with the increase of the cone angle, the maximum thermal interference intensity in the radial direction was 4.54 m·°C/W, 4.41 m·°C/W, 4.37 m·°C/W, 4.31 m·°C/W, and 4.23 m·°C/W respectively, and that in the generatrix direction was 3.96 m·°C/W, 3.91 m·°C/W, 3.88 m·°C/W, 3.84 m·°C/W and 3.77 m·°C/W, respectively, proving that the CoHEP with a large cone angle can significantly reduce thermal interference. Meanwhile, a scientific zone criterion of the heat transfer characteristics of CoHEP was given quantitatively to evaluate the thermal interference of CoHEP from the interference intensity in the radial direction and directions. Particularly, three zones of weak thermal interference zone, transition thermal interference zone and serious thermal interference zone were presented. There was no difference in the proportions of weak zone, transition zone and serious zone for 0°5°, 10° and 15°, which were 7.69%, 15.38% and 76.92%, respectively. The proportions of thermal interference weak zone, transition zone and serious zone in the radial direction of 20° CoHEP were 7.69%, 23.08% and 69.23% respectively, and that of thermal interference in the generatrix direction were 7.69%, 17.05% and 75.26%, respectively, implying that CoHEP with a large cone angle exhibits better heat transfer characteristics and is not easy to develop into a region with severe thermal interference.

截顶圆锥螺旋能量堆（CoHEP）是一种新型的环保且具有成本效益的地面热交换器，具有强大的传热能力。然而，由于其复杂的几何形状和半无限的介质，其传热特性，尤其是热干扰尚未得到充分的解释。为了了解径向和母线方向的热干扰，本文基于其结构特点，提出了一种将螺旋管作为一系列环形线圈的有效建模方法，使这些环形线圈等效于热源。基于管道中的热传递。定义了基于典型位置温度的热干扰指数来描述CoHEP的热干扰。通过现场实验验证了等效热源建模方法的准确性和高效率。最终，数值模拟了圆锥角为0°，5°，10°，15°和20°的圆柱形能量桩的CoHEP。结果表明，随着锥角的增加，热干扰强度减小，径向最大热干扰强度为4.54 m·°C / W，4.41 m·°C / W，4.37 m·°C / W分别为4.31 m·°C / W和4.23 m·°C / W，母线方向分别为3.96 m·°C / W，3.91 m·°C / W，3.88 m·°C / W，分别为3.84 m·°C / W和3.77 m·°C / W，证明具有大锥角的CoHEP可以显着降低热干扰。与此同时，定量给出了CoHEP传热特性的科学区域标准，以从径向和方向上的干扰强度评估CoHEP的热干扰。特别地，提出了弱热干扰区，过渡热干扰区和严重热干扰区三个区域。0°5°，10°和15°的弱区，过渡区和严重区的比例没有差异，分别为7.69％，15.38％和76.92％。20°CoHEP径向热干扰弱区，过渡区和严重区的比例分别为7.69％，23.08％和69.23％，母线方向热干扰的比例分别为7.69％，17.05％和75.26％ ， 分别，