A coupled FDEM-CFD method for modelling heat exchange effectiveness in enhanced geothermal systems-excavation

IF 4.2 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Engineering Analysis with Boundary Elements Pub Date : 2024-09-30 DOI:10.1016/j.enganabound.2024.105980

Taihua Yang , Linjie Gao , Quansheng Liu , Bin Liu , Yuan Zhou , Peng Li

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Abstract

Accurately assessing the impact of hydraulic fracturing technology on the heat exchange efficiency of Enhanced Geothermal Systems (EGS-E) is crucial. This paper proposes a coupled FDEM-CFD method to predict the heat exchange efficiency of EGS-E systems. Firstly, the FDEM method was adopted to establish a numerical model for EGS-E horizontal roadways. The physical process of fracture initiation, propagation, and the eventual formation of a coherent fracture network within intact rock mass were numerically studied. Subsequently, combined with CFD method, the flow and heat exchange processes between cold water and rock in horizontal roadway were investigated. The effects of hydraulic fracturing technology on the heat exchange efficiency of EGS-E project were comprehensively studied by comparing the water-rock heat exchange efficiency before and after fracturing. The results show that, hydraulic fracturing can increase the water-rock heat exchange area by 1385.5710 %, and the temperature difference between inlet and outlet increases by 8.3365 %. It shows that hydraulic fracturing improves the heat exchange efficiency of EGS-E.

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模拟强化地热系统热交换效果的 FDEM-CFD 耦合方法--开挖

准确评估水力压裂技术对强化地热系统（EGS-E）热交换效率的影响至关重要。本文提出了一种 FDEM-CFD 耦合方法来预测 EGS-E 系统的热交换效率。首先，采用 FDEM 方法建立了 EGS-E 水平巷道的数值模型。数值研究了完整岩体中断裂萌生、传播以及最终形成连贯断裂网络的物理过程。随后，结合 CFD 方法，研究了水平巷道中冷水与岩石之间的流动和热交换过程。通过对比压裂前后的水岩热交换效率，全面研究了水力压裂技术对 EGS-E 工程热交换效率的影响。结果表明，水力压裂可使水岩热交换面积增加 1385.5710%，进出口温差增加 8.3365%。这表明水力压裂提高了 EGS-E 的热交换效率。

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来源期刊

Engineering Analysis with Boundary Elements 工程技术-工程：综合

CiteScore

5.50

自引率

18.20%

发文量

368

审稿时长

56 days

期刊介绍： This journal is specifically dedicated to the dissemination of the latest developments of new engineering analysis techniques using boundary elements and other mesh reduction methods. Boundary element (BEM) and mesh reduction methods (MRM) are very active areas of research with the techniques being applied to solve increasingly complex problems. The journal stresses the importance of these applications as well as their computational aspects, reliability and robustness. The main criteria for publication will be the originality of the work being reported, its potential usefulness and applications of the methods to new fields. In addition to regular issues, the journal publishes a series of special issues dealing with specific areas of current research. The journal has, for many years, provided a channel of communication between academics and industrial researchers working in mesh reduction methods Fields Covered: • Boundary Element Methods (BEM) • Mesh Reduction Methods (MRM) • Meshless Methods • Integral Equations • Applications of BEM/MRM in Engineering • Numerical Methods related to BEM/MRM • Computational Techniques • Combination of Different Methods • Advanced Formulations.