Nanofluid-Driven Heat Transfer Augmentation for Enhanced Geothermal Extraction in U-Shaped Wells.
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| Title: | Nanofluid-Driven Heat Transfer Augmentation for Enhanced Geothermal Extraction in U-Shaped Wells. |
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| Authors: | Guo, Junhui1,2 (AUTHOR), Wang, Jingyi2 (AUTHOR), Gu, Shefeng2,3 (AUTHOR), Li, Jing1,2 (AUTHOR), Wang, Zheng2 (AUTHOR), Wang, Sijia3 (AUTHOR) sijia.wang@hebut.edu.cn |
| Source: | Energies (19961073). Jun2026, Vol. 19 Issue 11, p2706. 16p. |
| Subject Terms: | *Nanofluids, *Heat transfer, *Finite element method, *Geothermal resources, *Nanoparticles, *Geothermal wells, *Thermal conductivity |
| Abstract: | U-shaped well geothermal energy exploitation has become a key pathway for sustainable energy development, valued for its clean and stable attributes. However, constrained by the limited heat transfer capacity between the wellbore and traditional circulating water, the thermal extraction efficiency of the circulating fluid in the U-shaped well remains difficult to breakthrough, severely hindering the large-scale application. This work conducts a study on the optimization of the thermal conductivity performance of circulating working fluids based on water-phase dispersed nanoparticles, aiming to explore efficient heat transfer methods for the circulating working fluids in geothermal reservoir U-shaped wells. The finite element simulation is employed to analyze the influence of Al2O3 nanoparticle concentration (0–5%) and injection rate (4000–9000 m3/d) on thermal conductivity performance and flow characteristics. The results demonstrate that the Al2O3-H2O nanofluid with a particle size of 10 nm and a concentration of 5% exhibits the optimal heat transfer performance. Under the optimization objective of maximizing net heat output with the pipe-velocity safety constraint satisfied, when the injection rate is 5000 m3/d, the heat extraction efficiency is improved by 21.31% compared with that of pure water. This work may provide theoretical data for efficient geothermal exploitation. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Abstract: | U-shaped well geothermal energy exploitation has become a key pathway for sustainable energy development, valued for its clean and stable attributes. However, constrained by the limited heat transfer capacity between the wellbore and traditional circulating water, the thermal extraction efficiency of the circulating fluid in the U-shaped well remains difficult to breakthrough, severely hindering the large-scale application. This work conducts a study on the optimization of the thermal conductivity performance of circulating working fluids based on water-phase dispersed nanoparticles, aiming to explore efficient heat transfer methods for the circulating working fluids in geothermal reservoir U-shaped wells. The finite element simulation is employed to analyze the influence of Al2O3 nanoparticle concentration (0–5%) and injection rate (4000–9000 m3/d) on thermal conductivity performance and flow characteristics. The results demonstrate that the Al2O3-H2O nanofluid with a particle size of 10 nm and a concentration of 5% exhibits the optimal heat transfer performance. Under the optimization objective of maximizing net heat output with the pipe-velocity safety constraint satisfied, when the injection rate is 5000 m3/d, the heat extraction efficiency is improved by 21.31% compared with that of pure water. This work may provide theoretical data for efficient geothermal exploitation. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 19961073 |
| DOI: | 10.3390/en19112706 |
