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Numerical analysis of the heat production performance of a closed loop geothermal system

机译：闭环地热系统产热性能的数值分析

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摘要

The Closed Loop Geothermal System (CLGS) is a novel method for exploiting geothermal energy. However, to the best of our knowledge, few studies have investigated the heat production performance of CLGS, which is particularly important for its field application. Hence, in this paper, an unsteady-state heat transfer model for CLGS is presented that considers variation of convection heat transfer coefficient. The finite difference method is employed to solve the mathematical model. The proposed model is verified with an analytical solution. Subsequently, the temperature field of CLGS is analysed, and influences of key parameters on CLGS performance are studied. The results indicate that the production process of CLGS can be divided into three sections: decreasing region, transition region and stable production region. The flow rate, inlet temperature and horizontal section length have significant influences on CLGS performance. To obtain the higher thermal power and appropriate outlet temperature, there is a critical value for flow rate. Additionally, the longer horizontal section length and larger temperature difference between the working fluid and formation are beneficial for improving CLGS performance. Finally, small wellbores should be drilled for CLGS. The main findings of this work can offer guidance for the design and optimization of CLGS. (C) 2017 Elsevier Ltd. All rights reserved.
机译：闭环地热系统（CLGS）是一种利用地热能的新方法。然而，据我们所知，很少有研究调查CLGS的发热性能，这对于其现场应用特别重要。因此，本文提出了一种考虑对流换热系数变化的CLGS非稳态传热模型。采用有限差分法求解数学模型。所提出的模型已通过解析解决方案进行了验证。随后，分析了CLGS的温度场，并研究了关键参数对CLGS性能的影响。结果表明，CLGS的生产过程可分为三个区域：递减区，过渡区和稳定区。流速，入口温度和水平截面长度对CLGS性能有重要影响。为了获得更高的热功率和适当的出口温度，流速有一个临界值。另外，较长的水平截面长度和工作流体与地层之间的较大温差有利于改善CLGS性能。最后，应为CLGS钻小井眼。这项工作的主要发现可以为CLGS的设计和优化提供指导。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Renewable energy》 |2018年第5期|365-378|共14页
  • 作者

    Song Xianzhi; Shi Yu; Li Gensheng; Shen Zhonghou; Hu Xiaodong; Lyu Zehao; Zheng Rui; Wang Gaosheng;

  • 作者单位

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Geothermal energy; Closed loop; Unsteady-state heat transfer; Numerical model; Heat production performance;

    机译：地热能;闭环;非稳态传热;数值模型;热力生产性能;

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