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建立了内置并联U形埋管能量桩热交换的理论模型,该模型考虑了管内循环液体竖向对流换热和支管之间的热干扰。通过与数值模拟结果的对比,验证了所提模型的可靠性。基于该模型分析了桩内埋管布置形式对能量桩换热效率的影响,结果表明:整体上能量桩换热效率随埋管数量增加而提高,尤其是桩内埋管数较少时,而当埋管达到一定数量后,再增加对能量桩的换热效率影响很小;若埋管数量一定,桩内所有U形管的支管等间距布置时能量桩的换热效率最高;U形管进出水支管的布置顺序对能量桩的换热效率影响很小;若循环液流动速度保持不变,增加埋管直径能增大能量桩的换热效率。
The theoretical model of the heat exchange between the embedded U-shaped energy pipe and the pile is established. The model considers the vertical convective heat transfer and the thermal interference between the branch pipes. By comparing with the numerical simulation results, the reliability of the proposed model is verified. Based on the model, the effect of pipe layout on the heat transfer efficiency of energy piles is analyzed. The results show that the overall heat transfer efficiency of energy piles increases with the increase of the number of buried pipes, especially when the number of buried pipes in piles is small When the pipe reaches a certain amount, the heat transfer efficiency of the energy pile is little affected. If the pipe number is constant, the heat transfer efficiency of the energy pile is the highest when the branch pipes of all the U-shaped pipes are arranged at equal intervals. The arrangement sequence of inlet and outlet branch pipes has little effect on the heat transfer efficiency of the energy pile. If the flow velocity of the circulating fluid remains unchanged, increasing the diameter of the buried pipe can increase the heat transfer efficiency of the energy pile.