Analysis of key factors affecting single well geothermal heating

被引：1
|
作者：
Bu X.-B. [1 ,2 ,3 ]
Ran Y.-M. [1 ,4 ]
Wang L.-B. [1 ,2 ,3 ]
Lei J.-M. [5 ]
Li H.-S. [1 ,2 ,3 ]
机构：
[1] Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou
[2] Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou
[3] Guangdong Key Laboratory of New and Renewable Energy Research and Development, Guangzhou
[4] University of Chinese Academy of Sciences, Beijing
[5] Lanzhou LS Energy Equip Engineering Co. Ltd, Lanzhou
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2019年 / 53卷 / 05期
关键词：
Geothermal gradient; Geothermal heating; Heat attenuation; Rock thermal resistance; Single well;
D O I：
10.3785/j.issn.1008-973X.2019.05.017
中图分类号：
学科分类号：
摘要：
The effects of well diameter, rock thermal conductivity, well depth and geothermal gradient on produced water temperature and extraction heat power were studied based on the mathematical equations for flow heat transfer and rock energy in geothermal well. Results showed that the produced water temperature, extraction heat power and rock temperature field always reduced with time. The average extraction heat power was respectively 755.01, 660.02 and 639.42 kW for the first, tenth and twentieth heating seasons, and the above data can be used for the type selection of heat pump. The spacing of 200 m can avoid thermal disturbance among the wells with heating time of 20 years. The rock thermal conduction resistance was far greater than the fluid convection heat resistance and the well wall thermal conduction resistance, so reducing rock thermal conduction resistance was the most effective method for increasing extraction heat power. The rock thermal conduction resistance can be reduced by increasing the well diameter and the rock thermal conductivity. The extraction heat power can increase 100 kW with the increase of rock thermal conductivity of 0.5 W/(m•K). The temperature difference between liquid and rock can be raised by increasing geothermal gradient and well depth, and thus leading to the increase in extraction heat power. The extraction heat power can increase 213.54 kW with the increase of geothermal gradient of 10 K/km. © 2019, Zhejiang University Press. All right reserved.
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页码：957 / 964
页数：7
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