地面耦合热泵系统的井田设计通常基于所谓的g函数，即预先计算的阶跃热负荷下的无量纲温度响应。g函数特定于钻孔场的几何结构。对于特定井田的长期分析，平均井壁温度由g函数及其热负荷阶跃的时间叠加得到。关于井壁（和沿井壁）使用的边界条件，g函数有两种公认的规定:在每一时刻的恒定热通量，或在恒定总热流流入井壁时的均匀温度。 本文根据西班牙瓦伦西亚理工大学2x3钻孔示范场的几何特征和地温特性，建立了一个数值模型。分别研究了这两种边界条件下的模型。首先根据g函数对模型进行比较，并与参考解进行验证。然后，从这些模型中获得每天的流体温度，并在六年期间测量每天的负荷。将结果与运行第六年的每日流体温度测量值进行比较。总的来说，模拟值与实测数据吻合良好。 结果表明，在井壁的边界条件方面没有显著差异，这是由于该系统是热平衡的。在冷却期间，模拟的温度更准确。引文:ASHRAE论文CD:2014 ASHRAE年会，华盛顿州西雅图

The design of borehole fields for ground coupled-heat pump systems is often based on so-called g-functions, a pre-calculated dimensionless temperature response to a step heat load. The g-function is specific to the borehole field geometry. For a long-term analysis of a particular borehole field, the average borehole wall temperature is obtained from the g-function and a temporal superposition of its thermal load steps. There are two accepted provisions for the g-function regarding the boundary condition used at (and along) the borehole wall: a constant heat flux at every instant of time, or a uniform temperature at constant total heat flow to the borehole field, respectively. In this paper, a numerical model is built up according to the geometrical characteristics and ground thermal properties of a 2x3 borehole demo site at the Universitat Politecnica de València, Spain. The model is separately studied with regard to the two boundary conditions. The models are first compared in terms of their g-function, which are verified against reference solutions. Then, the daily fluid temperatures are obtained from each of these models with measured daily loads during a six year period. The results are compared with measured daily fluid temperatures for the sixth year of operation. The simulated values present, in general, a good agreement with the measured data. The results show that there are no significant differences with regard to the boundary conditions at the borehole wall, which for this specific case is due to the fact that the system is thermally balanced. The simulated temperatures are more accurate during cooling periods.