An experiment on heat extraction from a deep geothermal well using a downhole coaxial open loop design

Dai, Caili; Li, Jiashu; Shi, Yu; Zeng, Long; Lei, Haiyan

doi:10.1016/j.apenergy.2019.113447

Cited by 57 publications

(17 citation statements)

References 15 publications

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“…These were followed by finite volume methods (FVM) with 18.4%, while the remaining 21.1% of the studies did not report the methods used. CCLGS --Bu et al [30] CCLGS FVM -Focaccia and Tinti [31] CCLGS --Yekoladio et al [32] CCLGS --Templeton et al [33] CCLGS FEM FlexPDE Wight and Bennett [34] CCLGS --Le Lous et al [35] CCLGS FEM FFEFLOW Noorollahi et al [36] CCLGS FVM Ansys Alimonti and Soldo [37] CCLGS --Mokhtari et al [38] CCLGS --Caulk and Tomak [39] CCLGS FEM Comsol Sun et al [40] CCLGS-H FDM -Song et al [25] CCLGS FDM -Shi et al [41] CCLGS FEM Comsol Renaud et al [42] CCLGS FVM Ansys Ghoreishi-Madiseh et al [43] CCLGS FVM Ansys Zhang et al [44] CCLGS FEM Comsol Sun et al [45] CCLGS-H FDM -Wang et al [46] CCLGS-H FDM -Yu et al [47] CCLGS FDM -Yildirim et al [48] CCLGS FEM Comsol Dai et al [49] CCLGS FVM -Hu et al [50] CCLGS FEM Comsol Wang et al [51] CCLGS-H FEM Comsol Hu et al [52] CCLGS FVM T2Well Kalmár et al [53] CCLGS FDM -He et al [54] CCLGS _ -Wang et al [26] CCLGS-H FEM Comsol Wang et al [55] CCLGS-H FEM Comsol Pokhrel et al [56] CCLGS FVM Ansys Sun et al [57] UCLGS FDM -Sun et al [58] UCLGS FDM -Yuan et al [59] UCLGS FDM -Ghavidel et al [60] UCLGS FEM Comsol Fallah et al [61] UCLGS FDM -Zhang et al [62] UCLGS FDM -Note: CCLGS-H-Horizontal CCLGS.…”

Section: Clgss Modelsmentioning

confidence: 99%

A Systematic Review of the Design and Heat Transfer Performance of Enhanced Closed-Loop Geothermal Systems

et al. 2022

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Geothermal energy is one of the primary sources of clean electricity generation as the world transitions away from fossil fuels. In comparison to enhanced geothermal methods based on artificial fracturing, closed-loop geothermal systems (CLGSs) avoid seismicity-induced risk, are independent of reservoir permeability, and do not require the direct interaction between the fluid and the geothermal reservoir. In recent years, the development of CLGS technologies that offer high energy efficiencies has been explored. Research on coaxial closed-loop geothermal systems (CCLGS) and U-shaped closed-loop geothermal system (UCLGS) systems were reviewed in this paper. These studies were categorized based on their design, modeling methods, and heat transfer performance. It was found that UCLGSs had superior heat transfer performances compared to CCLGS. In addition, UCLGSs that utilized CO2 as a working fluid were found to be promising technologies that could help in addressing the future challenges associated with zero-emission compliance and green energy demand. Further research to improve the heat transfer performance of CLGS, especially with regards to improvements in wellbore layout, equipment sizing, and its integration with CO2 capture technologies is critical to ensuring the feasibility of this technology in the future.

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Section: Clgss Modelsmentioning

confidence: 99%

A Systematic Review of the Design and Heat Transfer Performance of Enhanced Closed-Loop Geothermal Systems

et al. 2022

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“…As over 50% of the total cost of the geothermal project can be drilling costs [69], a good solution to reduce high drilling costs is presented by using depleted and abandoned gas and oil wells, which has been extensively investigated recently [70][71][72][73]. Depending on the obtained temperature in DBHE, these systems can be used for direct space heating [74,75], coupled with heat pumps [76][77][78], or even in power production systems [79].…”

Section: Vertical Heat Exchanger Configurationsmentioning

confidence: 99%

Application and Design Aspects of Ground Heat Exchangers

et al. 2021

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With the constant increase in energy demand, using renewable energy has become a priority. Geothermal energy is a widely available, constant source of renewable energy that has shown great potential as an alternative source of energy in achieving global energy sustainability and environment protection. When exploiting geothermal energy, whether is for heating or cooling buildings or generating electricity, a ground heat exchanger (GHE) is the most important component, whose performance can be easily improved by following the latest design aspects. This article focuses on the application of different types of GHEs with attention directed to deep vertical borehole heat exchangers and direct expansion systems, which were not dealt with in detail in recent reviews. The article gives a review of the most recent advances in design aspects of GHE, namely pipe arrangement, materials, and working fluids. The influence of the main design parameters on the performance of horizontal, vertical, and shallow GHEs is discussed together with commonly used performance indicators for the evaluation of GHE. A survey of the available literature shows that thermal performance is mostly a point of interest, while hydraulic and/or economic performance is often not addressed, potentially resulting in non-optimal GHE design.

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“…Coaxial heat exchangers, see Figure A.6, promise to outperform their U-bend counterparts. For this reason, the study of coaxial heat exchangers has received serious attention (Holmberg et al, 2016;Gordon et al, 2018, Dai et al, 2019Iry and Rafee, 2019;Liu et al, 2019;Luo et al, 2019;Pan et al, 2019;Zhang et al, 2019;Cazorla-Marín et al, 2020, Hu et al, 2020. Potential reasons behind the better performance include: (i) a larger heat transfer surface area for a given borehole size, (ii) the fluid in the inner pipe is significantly more insulated from the ground and, thus, exchanges minimum heat with the ground, (iii) possibly less pressure (head) loss because of the larger (compared to its conventional U-bend counterpart) and potentially shorter (to deliver the same amount of heat from or to the ground) conduit.…”

Section: A5 Geothermal Heat Exchangermentioning

confidence: 99%

Appendix: Sample Design and Optimization Projects

2021

Engineering Design and Optimization of Thermofluid Systems

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An experiment on heat extraction from a deep geothermal well using a downhole coaxial open loop design

Cited by 57 publications

References 15 publications

A Systematic Review of the Design and Heat Transfer Performance of Enhanced Closed-Loop Geothermal Systems

A Systematic Review of the Design and Heat Transfer Performance of Enhanced Closed-Loop Geothermal Systems

Application and Design Aspects of Ground Heat Exchangers

Appendix: Sample Design and Optimization Projects

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