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Numerical research on thermal response for geothermal energy pile groups under groundwater flow
Geomechanics for Energy and the Environment ( IF 5.1 ) Pub Date : 2021-05-12 , DOI: 10.1016/j.gete.2021.100257
Yang Lou , Peng-fei Fang , Xin-yu Xie , Chiew Shan Anthony Chong , Fu-yuan Li , Chun-yang Liu , Zhong-jin Wang , Da-yong Zhu

A 3D numerical heat transfer model is established and validated to investigate the effect of groundwater flow on the thermal response of geothermal energy pile (GEP) groups. A constant heating flux with different groundwater flow velocities is applied to four common types of GEP groups in residential buildings. The results show that groundwater flow has an effect on the thermal performance of GEP groups, and the average coefficient of performance of the GEP groups has an increase with groundwater flow. In the short-term (e.g., a month), the GEP spacing of 3 times the pile diameter is convenient from the viewpoint of energy when the flow velocity is less than 0.01 m/yr. The amount of heat is carried from upstream GEPs to the downstream by groundwater flow, and the temperature difference between the upstream and downstream GEPs becomes more obvious with the increase of groundwater flow velocity. In addition, we discussed the differential thermal expansion caused by groundwater flow and its effect on the mechanical behavior of GEPs.



中文翻译:

地下水流作用下地热能桩群热响应数值研究

建立并验证了 3D 数值传热模型,以研究地下水流对地热能桩 (GEP) 组热响应的影响。将具有不同地下水流速的恒定加热通量应用于住宅建筑中四种常见类型的 GEP 组。结果表明,地下水流量对GEP组的热性能有影响,GEP组的平均性能系数随着地下水流量的增加而增加。在短期内(如一个月),当流速小于0.01 m/yr 时,从能量的角度考虑,3 倍桩径的GEP 间距是方便的。热量通过地下水流从上游 GEP 带到下游,随着地下水流速的增加,上下游GEP之间的温差变得更加明显。此外,我们讨论了由地下水流引起的不同热膨胀及其对 GEP 力学行为的影响。

更新日期:2021-06-17
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