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The annual fluctuation of underground temperature response caused by ground heat exchanger in the condition of groundwater seepage

机译：地下水渗流条件下地面换热器引起的地下温度响应的年度波动

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Groundwater seepage plays a role in the heat transfer between ground heat exchanger (GHE) and the surrounding underground medium, and the heat transfer mode is converted from conduction to combined case containing both conduction and convection, which means groundwater seepage inevitably exerts influence on the underground temperature response caused by GHE. The paper describes the equations of underground temperature response while groundwater flows through GHE by means of three-dimensional velocity, and this is the new knowledge differing from traditional one-dimensional velocity. The dimensionless method is employed to conveniently express the formulas; the temperature fields around GHE are investigated to show the influence of groundwater seepage, and the comparisons between without and with groundwater seepage are made. Afterwards, the underground temperature variations of different conditions are analyzed, some stages including cooling period, heating period and transitional period are adopted to analyze the corresponding temperature variations, and the influencing factors for annual underground temperature variation are discussed. In addition, the angles of seepage direction are illustrated, and the temperature response of one location can be changed with the angles. The researches of the paper are novel for further understanding the groundwater seepage. (C) 2019 Elsevier B.V. All rights reserved.
机译：地下水渗流在地面热交换器（GHE）与周围地下介质之间的传热中起着一定的作用，并且传热模式从传导转换为兼有传导和对流的组合情况，这意味着地下水渗入不可避免地会对地下产生影响。 GHE引起的温度响应。本文利用三维速度描述了地下水流经GHE时地下温度响应方程，这是不同于传统一维速度的新知识。采用无量纲方法方便地表达公式。研究了GHE周围的温度场，显示了地下水渗流的影响，并对有无渗水和有渗水的情况进行了比较。然后，分析了不同条件下的地下温度变化，采用冷却期，加热期和过渡期等阶段分析了相应的温度变化，并探讨了影响地下年度温度变化的因素。另外，示出了渗透方向的角度，并且可以随角度改变一个位置的温度响应。本文的研究对于进一步了解地下水渗流是新颖的。 （C）2019 Elsevier B.V.保留所有权利。

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