This paper presents a hybrid simulation approach for 1U-, 2U- and coaxial single, and field of, borehole heat exchangers. We implement a novel combination of existing solutions for the simulation of heat transfer processes within the borehole and the surrounding ground. The heat transfer in the ground is modelled with a combination of analytically determined g-functions, the borehole models utilize thermal resistance capacity models and the finite volume method. Critically, we improve the computational efficiency of long-term simulations by sub-dividing the time scale into multiple periods, where the influence of past periods on future periods is calculated using the fast Fourier transform (FFT). The accuracy and efficiency of the proposed method is validated against single borehole numerical models and a 40 bore field case study. The method achieves computational times reductions of over 90% in some cases, with greater improvement as the simulation time increases.

中文翻译：

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用于地热钻孔场的时间高分辨率模拟的计算高效混合模型的开发和验证

本文提出了一种混合模拟方法，用于 1U、2U 和同轴单管和现场埋管换热器。我们对现有解决方案实施了一种新颖的组合，用于模拟钻孔和周围地面的传热过程。地下传热通过分析确定的 g 函数的组合进行建模，钻孔模型利用热阻容量模型和有限体积法。至关重要的是，我们通过将时间尺度细分为多个时期来提高长期模拟的计算效率，其中过去时期对未来时期的影响是使用快速傅里叶变换 (FFT) 计算的。所提出方法的准确性和效率通过单孔数值模型和 40 孔现场案例研究得到验证。