Ground Source Heat Pumps (GSHPs) connected to Borehole Heat Exchangers (BHEs) are a fast-growing technology for thermally efficient buildings. Therefore, areas with several independent GSHP installations close to each other are becoming more and more common. To guarantee an optimal operation of these systems, it is necessary to design them considering the influence of the neighbouring installations. However, a tailored model for this scope has not been found in the literature.

In this paper, we aim at filling this gap by proposing and validating a methodology to calculate the thermal influence between neighbouring independent boreholes. It is based on the Finite Line Source (FLS) model and prescribes novel boundary conditions, tailored to hydraulically independent boreholes. The methodology allows to prescribe different thermal loads to different BHEs and imposes uniform temperature boundary condition on each borehole wall.

We also show how to implement and apply the model. Our application shows a thermal influence of up to 1.5 K during the lifetime of a GSHP and of up to 0.8 K during the first year of operation in an area with a relatively low number of installations, underlying the importance of considering the thermal influence and the usefulness of our proposed model. Finally, a sensitivity study on the ground thermal conductivity shows the importance of a correct estimation of this property for accurate simulation results.

连接到钻孔换热器 (BHE) 的地源热泵 (GSHP) 是一种快速发展的热效率建筑技术。因此，多个独立地源热泵装置彼此靠近的区域变得越来越普遍。为了保证这些系统的最佳运行，有必要在设计时考虑相邻设施的影响。但是，在文献中尚未找到针对此范围的定制模型。

在本文中，我们旨在通过提出和验证一种计算相邻独立钻孔之间热影响的方法来填补这一空白。它基于有限线源 (FLS) 模型并规定了新的边界条件，专为水力独立的钻孔量身定制。该方法允许为不同的 BHE 规定不同的热负荷，并在每个钻孔壁上施加均匀的温度边界条件。

我们还展示了如何实现和应用该模型。我们的应用表明，在 GSHP 的使用寿命期间，热影响高达 1.5 K，在安装数量相对较少的地区运行的第一年，热影响高达 0.8 K，这说明考虑热影响和我们提出的模型的有用性。最后，对地面热导率的敏感性研究表明，正确估计该属性对于准确模拟结果的重要性。