Definition of a thermal conductivity map for geothermal purposes

IF 2.9 2区 地球科学 Q3 ENERGY & FUELS Geothermal Energy Pub Date : 2024-05-29 DOI:10.1186/s40517-024-00292-8
Carlota García-Noval, Rodrigo Álvarez, Silverio García-Cortés, Carmen García, Fernando Alberquilla, Almudena Ordóñez
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Abstract

The use of geothermal energy is spreading globally due to its many advantages, especially for heating and cooling. The correct design of a geothermal system requires knowledge of the parameters of the subsoil rocks, and particularly the thermal conductivity (k), which is the intrinsic ability of a material to transfer thermal energy as a result of a temperature gradient. A thermal conductivity map of the geological formations is time-consuming to produce, but can be of great help when selecting the location of a low-enthalpy geothermal installation, resulting in significant savings and an increase in the efficiency of that installation. The preferred option for determining k is an in situ thermal response test, but laboratory methods may be an alternative if it is not available or affordable. In this work, the needle thermal probe method has been used to measure the k of representative outcropping rocks in Oviedo (NW Spain), since it allows to obtain a rapid determination, its cost is comparatively low and it can be implemented in a portable device. 162 measurements have been carried out on a total of 27 samples, ranging from 0.2 (clay) to 5.4 W m−1 K−1 (quartzite). A relationship has been found between the k of the rocks and their characteristics, such as mineralogy, anisotropy or geological age and a thermal conductivity map was created.

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地热导热图的定义
地热能具有许多优点,尤其是在供暖和制冷方面,因此正在全球范围内推广使用。地热系统的正确设计需要了解地下岩石的参数,特别是导热系数(k),即材料在温度梯度作用下传递热能的内在能力。绘制地质构造的导热图需要耗费大量时间,但在选择低焓地热装置的位置时却大有裨益,可大大节省成本并提高装置的效率。确定 k 值的首选方法是现场热响应测试,但如果没有或负担不起,也可以采用实验室方法。在这项工作中,使用了针式热探针方法来测量奥维耶多(西班牙西北部)代表性露头岩石的 k 值,因为这种方法可以快速确定 k 值,成本相对较低,而且可以在便携式设备中使用。共对 27 个样本进行了 162 次测量,测量范围从 0.2(粘土)到 5.4 W m-1 K-1(石英岩)不等。发现了岩石的 K 值与其特征(如矿物学、各向异性或地质年代)之间的关系,并绘制了导热图。
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来源期刊
Geothermal Energy
Geothermal Energy Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology
CiteScore
5.90
自引率
7.10%
发文量
25
审稿时长
8 weeks
期刊介绍: Geothermal Energy is a peer-reviewed fully open access journal published under the SpringerOpen brand. It focuses on fundamental and applied research needed to deploy technologies for developing and integrating geothermal energy as one key element in the future energy portfolio. Contributions include geological, geophysical, and geochemical studies; exploration of geothermal fields; reservoir characterization and modeling; development of productivity-enhancing methods; and approaches to achieve robust and economic plant operation. Geothermal Energy serves to examine the interaction of individual system components while taking the whole process into account, from the development of the reservoir to the economic provision of geothermal energy.
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