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Heat transfer formalism using GFM and FEM in underground tunnels

机译：使用GFM和FEM在地下隧道中进行传热形式化

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摘要

Underground tunnel temperature is an essential factor that influences both the environment and energy consumption in subways. Therefore, any formalism that addresses underground tunnel temperature is required to take into account the inhomogeneity in the thermal properties of the soil and transition phases in the long-term heat transfer process. In this study, a two-dimensional unsteady heat transfer formalism based on a Green's function method (GFM) and finite element method (FEM) was proposed to consider the realities in underground tunnels. The boundaries in this model were classified into air-soil interface, soil-tunnel interface, and distant boundary. Moreover, a case study was conducted and validated through simulations and experiments. A satisfactory agreement was achieved between the simulation results and field measurement data from Guangzhou Metro Line? and Line5, which are newly built and 10-year old operational subway lines, respectively. The results from the case study indicate that the proposed formalism has very good prediction capability to describe the subway tunnel temperature under various operation conditions.
机译：地下隧道温度是影响地铁环境和能耗的重要因素。因此，任何涉及地下隧道温度的形式主义都需要考虑到长期传热过程中土壤和过渡相的热学特性的不均匀性。在这项研究中，提出了一种基于格林函数方法（GFM）和有限元方法（FEM）的二维非稳态传热形式，以考虑地下隧道的实际情况。该模型的边界分为气-土界面，土-隧道界面和远处边界。此外，还进行了案例研究，并通过模拟和实验进行了验证。广州地铁一号线的模拟结果与现场测量数据之间取得了令人满意的协议。和5号线，分别是新建和运营10年的地铁线路。案例研究结果表明，所提出的形式主义具有很好的预测能力，能够描述地铁隧道在各种运行条件下的温度。

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