The correct sizing of the borehole field in closed-loop Ground Source Heat Pump (GSHP) systems requires accurate value of the ground thermal properties, especially the thermal conductivity. One of two methods are generally applied to evaluate this parameter: the Thermal Response Test (TRT) and databases reported in guidelines or Standards for lithologies identified in the local stratigraphy.

This paper presents a database of more than 100 Thermal Response Tests performed in Italy. The equivalent thermal conductivities derived from the TRT outputs are here directly compared with the value estimated through knowledge of the local geological stratigraphy. The obtained results are analyzed in terms of geological setting. A sensitivity analysis on the borefield design has been conducted to evaluate the effects of the equivalent thermal conductivity estimation error on the calculation of the required total borehole length. The borehole length, in turn, strongly affects the initial investment costs as well as the operating conditions of the heat pump over the long term.

The obtained results, in some cases significant, highlight the importance of performing the TRT not only when the thermal capacity of the GSHP is high but also in the case of strong geological uncertainty, or in particular geological settings such as high plain areas, alpine valley floors and rocky environments. In the other cases as low plain areas, this database can provide an initial estimate of the range of the expected equivalent thermal conductivity value; therefore, it can be useful for designers of both GSHP systems and other applications where the knowledge of the underground thermal behavior is necessary.

在闭环地面源热泵（GSHP）系统中，井场尺寸的正确确定需要准确的地面热属性值，尤其是热导率。通常使用以下两种方法之一来评估该参数：热响应测试（TRT）和在当地地层中确定的岩性指南或标准中报告的数据库。

本文介绍了在意大利进行的100多次热响应测试的数据库。从TRT输出获得的等效热导率在这里直接与通过了解当地地质地层而估算的值进行比较。根据地质环境对获得的结果进行分析。已经对井眼设计进行了敏感性分析，以评估等效导热系数估算误差对所需总井眼长度的计算的影响。井眼的长度反过来会长期影响热泵的初始投资成本以及运行条件。

所获得的结果在某些情况下很重要，不仅在GSHP的热容量高时，而且在地质不确定性很强的情况下，特别是在诸如高平原地区，高山山谷等地质环境的情况下，都强调了进行TRT的重要性。地板和岩石环境。在其他情况下，例如低平原地区，该数据库可以提供对预期等效热导率值范围的初步估算。因此，对于需要了解地下热行为的GSHP系统和其他应用程序的设计人员而言，它可能是有用的。