在使用垂直地下换热器的典型地源热泵系统中，连接钻孔的水平管道可能超过垂直安装总长度的10%。在设计此类系统时，通常忽略水平管道对系统热性能的影响；然而，还没有人试图量化这一假设的影响。这项工作研究了两个地点的两栋建筑，分别采用了模拟的垂直地下换热器（包括水平地下换热器）和不使用水平地下换热器，以确定第一个地下换热器- 水平管道对整个系统性能影响的阶近似值。结果表明，使用十年的模拟期，在模拟中包括水平管道可以降低热泵进入流体的温度，最高可达0.8°C（1.4°F）。此外，在所研究的情况下，发现水平地面换热器相当于安装垂直长度的30%。引文:美国科学与技术研究院学报第119卷第2部分，科罗拉多州丹佛市。

In a typical ground-source heat pump system utilizing a vertical ground heat exchanger, the horizontal piping connecting boreholes can exceed 10% of the total length of the vertical installation. In designing such systems, the effect of the horizontal piping on the thermal performance of the system is typically neglected; however, there has not been an effort to quantify the effect of this assumption. This work studies two buildings in two locations with a simulated vertical ground heat exchanger, both with and without the addition of a horizontal ground heat exchanger, to determine a first-order approximation of the effect that the horizontal piping has on the performance of the system as a whole. The results show that, using a ten-year simulation period, the inclusion of the horizontal piping in the simulation leads to a mitigation of heat pump entering fluid temperatures of up to 0.8°C (1.4°F). Additionally, the horizontal ground heat exchanger is found to be equivalent to up to 30% of the installed vertical length for the cases studied.