Exploration on thermo-mechanical characteristics of energy piles with double-U pipes buried in parallel by means of numerical simulations

ZHANG Shuang; ZHAO Lei; GAO Lin; LIU Hua

doi:10.11949/j.issn.0438-1157.20181470

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Exploration on thermo-mechanical characteristics of energy piles with double-U pipes buried in parallel by means of numerical simulations

Fluid dynamics and transport phenomena | 更新时间：2026-07-24

- Exploration on thermo-mechanical characteristics of energy piles with double-U pipes buried in parallel by means of numerical simulations
- CIESC Journal Vol. 70, Issue 5, Pages: 1750-1760(2019)
- 作者机构：
  
  1.西安建筑科技大学建筑设备科学与工程学院，陕西西安 710055
  2.西安建筑科技大学土木工程学院，陕西西安 710055
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20181470
  CLC： TU 473
- Received：12 December 2018，
  
  Revised：2019-02-26，
  
  Online First：24 July 2026，
  
  Published：05 May 2019
- 稿件说明：
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张爽, 赵蕾, 高林, 刘华. 并联双U形桩基埋管换热器热-力学特征的数值仿真研究[J]. 化工学报, 2019, 70(5): 1750-1760

ZHANG Shuang, ZHAO Lei, GAO Lin, LIU Hua. Exploration on thermo-mechanical characteristics of energy piles with double-U pipes buried in parallel by means of numerical simulations[J]. CIESC Journal, 2019, 70(5): 1750-1760
张爽, 赵蕾, 高林, 刘华. 并联双U形桩基埋管换热器热-力学特征的数值仿真研究[J]. 化工学报, 2019, 70(5): 1750-1760 DOI： 10.11949/j.issn.0438-1157.20181470.

ZHANG Shuang, ZHAO Lei, GAO Lin, LIU Hua. Exploration on thermo-mechanical characteristics of energy piles with double-U pipes buried in parallel by means of numerical simulations[J]. CIESC Journal, 2019, 70(5): 1750-1760 DOI： 10.11949/j.issn.0438-1157.20181470.

摘要

桩基埋管换热器（能量桩）作为土壤源热泵的末端换热装置同时需承担常规桩基功能。因此，除其换热性能应满足空调供暖负荷需求之外，其间歇交替从周围土壤取、放热所引起的桩基应力变化亦不应危及上部建筑结构的稳定性。为了深刻揭示能量桩的热-力学特征，联合使用Comsol和Abaqus软件建立了并联双U形桩基埋管换热器的三维动态数值仿真模型，利用现场实测结果验证了仿真结果的正确性，分析了桩基内部的动态温度分布、轴力分布以及桩身位移状况；进一步探究了四种不同桩基长径比、流速情况下的双U形埋管以及三种不同埋管形式的桩基换热器的换热性能和力学特征，揭示了出口水温和单位桩深换热量等动态换热性能以及桩身轴力和桩顶位移等力学性能参数的时变特性。结果表明埋管形式和桩基长径比对桩基埋管换热器换热和力学性能的影响较显著，流速的影响较弱；长径比和流速越大，埋管的换热能力越大，但进、出口水温温差也越大，由温度变化所引起的附加桩身轴力、桩顶位移以及侧摩阻力也相应增大。

Abstract

Pile-based borehole heat exchangers (energy piles) can be used as terminal heat transfer devices for ground source heat pumps

playing the role of conventional pile foundations at the same time. Thus

not only their heat transfer performances must be good enough to meet heating or cooling air conditioning demands

but also the stress changes caused by intermittent heat extraction and release alternatively from and to the soil surroundings should not endanger the stability of building structures above. To reveal the thermo-mechanical characteristics of energy piles sufficiently

the so

ftware of Comsol and Abaqus were implemented jointly to establish a three-dimensional dynamic numerical simulation model for an energy pile with double-U pipes buried in parallel. Simulation results were validated by the data obtained during an

situ

test. Dynamic temperature distributions inside pile body

axial force distributions and the displacement of the pile body were analyzed. The heat transfer performances and mechanical characteristics of four energy piles in different ratios of pile length-to-diameter with double-U pipes buried in parallel were studied under the conditions of different water flow rates

as well as those of energy piles with three different forms of buried pipes. The results show that the influence of the form of the buried pipes and that of the length-to-diameter ratio of the pile on their heat transfer and mechanical performance are significant

and the influence of the flow velocity is weak. The larger the length-diameter ratio and the flow velocity

the greater the heat transfer capacity

the larger the temperature difference between the inlet and outlet water. And the additional pile axial forces

pile top displacements and side frictional resistances caused by temperature changes increase as well accordingly.

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