Effect of rock-soil stratification on the heat transfer performance of U-shaped butted well in medium-deep layers
The medium-deep geothermal exchanger featuring a U-shaped pipe configuration presents an optimal solution for geothermal energy heat exchange due to its capability to deliver higher temperature water, achieve greater heat extraction rates, and maintain minimal flow resistance. A layered analytical m...
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Editorial Department of Petroleum Reservoir Evaluation and Development
2023-12-01
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| Series: | Youqicang pingjia yu kaifa |
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| Online Access: | https://red.magtech.org.cn/fileup/2095-1426/PDF/1704252569925-1815924432.pdf |
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| author | GAO Xiaorong, LI Hongyan, REN Xiaoqing, SUN Caixia, LU Xingchen, LIU Lin, LYU Qiangqiang, XU Yong, DONG Wenbin, WANG Zemu, WANG Rongkang, MIAO Ruican |
| author_facet | GAO Xiaorong, LI Hongyan, REN Xiaoqing, SUN Caixia, LU Xingchen, LIU Lin, LYU Qiangqiang, XU Yong, DONG Wenbin, WANG Zemu, WANG Rongkang, MIAO Ruican |
| author_sort | GAO Xiaorong, LI Hongyan, REN Xiaoqing, SUN Caixia, LU Xingchen, LIU Lin, LYU Qiangqiang, XU Yong, DONG Wenbin, WANG Zemu, WANG Rongkang, MIAO Ruican |
| collection | DOAJ |
| description | The medium-deep geothermal exchanger featuring a U-shaped pipe configuration presents an optimal solution for geothermal energy heat exchange due to its capability to deliver higher temperature water, achieve greater heat extraction rates, and maintain minimal flow resistance. A layered analytical model for such exchanger is established based on the theory of thermal resistance in series methods. Experimental results are employed to validate the accuracy of this layered analytical model. By focusing on the Guanzhong Basin in Shaanxi Province as the focal point of research, the model investigates the influence of subterranean stratification in thermal conductivity and volumetric specific heat on the outlet water temperature and heat extraction rate throughout an entire heating period for a 3 000 m deep geothermal exchanger with U-shaped pipe. The findings reveal that the underground thermal conductivity stratification has a significant impact on the heat transfer performance. A simplistic approach using average thermal conductivity, as opposed to a detailed accounting of layered conductivities, results in an overestimation of outlet water temperature and heat extraction rate by approximately 6 % to 15 %. However, specific heat stratification exerts minimal influence on the subterranean heat transfer dynamics. This underscores the importance of considering the effects of underground thermal property stratification in the design and analysis of the heat transfer performance of a medium-deep geothermal exchanger with U-shaped pipe. For precise modeling and results, it is recommended to segment the underground area into at least eight distinct layers. |
| format | Article |
| id | doaj-art-bd22264dc65c4837997b078b9df0e462 |
| institution | DOAJ |
| issn | 2095-1426 |
| language | zho |
| publishDate | 2023-12-01 |
| publisher | Editorial Department of Petroleum Reservoir Evaluation and Development |
| record_format | Article |
| series | Youqicang pingjia yu kaifa |
| spelling | doaj-art-bd22264dc65c4837997b078b9df0e4622025-08-20T03:07:38ZzhoEditorial Department of Petroleum Reservoir Evaluation and DevelopmentYouqicang pingjia yu kaifa2095-14262023-12-0113670371210.13809/j.cnki.cn32-1825/te.2023.06.001Effect of rock-soil stratification on the heat transfer performance of U-shaped butted well in medium-deep layersGAO Xiaorong, LI Hongyan, REN Xiaoqing, SUN Caixia, LU Xingchen, LIU Lin, LYU Qiangqiang, XU Yong, DONG Wenbin, WANG Zemu, WANG Rongkang, MIAO Ruican01. Sinopec Green Energy Geothermal Development Co., Ltd., Baoding, Hebei 071800, China;2. School of Energy and Power Engineering, Xi'an Jiaotong University, Xi’an, Shaanxi 710049, China;3. College of Energy, China University of Geosciences, Beijing 100083, ChinaThe medium-deep geothermal exchanger featuring a U-shaped pipe configuration presents an optimal solution for geothermal energy heat exchange due to its capability to deliver higher temperature water, achieve greater heat extraction rates, and maintain minimal flow resistance. A layered analytical model for such exchanger is established based on the theory of thermal resistance in series methods. Experimental results are employed to validate the accuracy of this layered analytical model. By focusing on the Guanzhong Basin in Shaanxi Province as the focal point of research, the model investigates the influence of subterranean stratification in thermal conductivity and volumetric specific heat on the outlet water temperature and heat extraction rate throughout an entire heating period for a 3 000 m deep geothermal exchanger with U-shaped pipe. The findings reveal that the underground thermal conductivity stratification has a significant impact on the heat transfer performance. A simplistic approach using average thermal conductivity, as opposed to a detailed accounting of layered conductivities, results in an overestimation of outlet water temperature and heat extraction rate by approximately 6 % to 15 %. However, specific heat stratification exerts minimal influence on the subterranean heat transfer dynamics. This underscores the importance of considering the effects of underground thermal property stratification in the design and analysis of the heat transfer performance of a medium-deep geothermal exchanger with U-shaped pipe. For precise modeling and results, it is recommended to segment the underground area into at least eight distinct layers.https://red.magtech.org.cn/fileup/2095-1426/PDF/1704252569925-1815924432.pdf|medium-deep geothermal|u-shaped heat transfer butted well|thermal performance|rock-soil stratification|analytical model |
| spellingShingle | GAO Xiaorong, LI Hongyan, REN Xiaoqing, SUN Caixia, LU Xingchen, LIU Lin, LYU Qiangqiang, XU Yong, DONG Wenbin, WANG Zemu, WANG Rongkang, MIAO Ruican Effect of rock-soil stratification on the heat transfer performance of U-shaped butted well in medium-deep layers Youqicang pingjia yu kaifa |medium-deep geothermal|u-shaped heat transfer butted well|thermal performance|rock-soil stratification|analytical model |
| title | Effect of rock-soil stratification on the heat transfer performance of U-shaped butted well in medium-deep layers |
| title_full | Effect of rock-soil stratification on the heat transfer performance of U-shaped butted well in medium-deep layers |
| title_fullStr | Effect of rock-soil stratification on the heat transfer performance of U-shaped butted well in medium-deep layers |
| title_full_unstemmed | Effect of rock-soil stratification on the heat transfer performance of U-shaped butted well in medium-deep layers |
| title_short | Effect of rock-soil stratification on the heat transfer performance of U-shaped butted well in medium-deep layers |
| title_sort | effect of rock soil stratification on the heat transfer performance of u shaped butted well in medium deep layers |
| topic | |medium-deep geothermal|u-shaped heat transfer butted well|thermal performance|rock-soil stratification|analytical model |
| url | https://red.magtech.org.cn/fileup/2095-1426/PDF/1704252569925-1815924432.pdf |
| work_keys_str_mv | AT gaoxiaoronglihongyanrenxiaoqingsuncaixialuxingchenliulinlyuqiangqiangxuyongdongwenbinwangzemuwangrongkangmiaoruican effectofrocksoilstratificationontheheattransferperformanceofushapedbuttedwellinmediumdeeplayers |