Performance Analysis of Single-Well Enhanced Geothermal System for Building Heating

Autor: Haijun Liang, Xiaofeng Guo, Tao Gao, Lingbao Wang, Xianbiao Bu
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: The Scientific World Journal, Vol 2020 (2020)
Druh dokumentu: article
ISSN: 2356-6140
1537-744X
DOI: 10.1155/2020/7927052
Popis: Deep borehole heat exchanger (DBHE) technology does not depend on the existence of hot water reservoir and can be used in various regions. However, the heat extraction from DBHE can hardly be improved due to poor thermal conductivity of rocks. Here, a single-well enhanced geothermal system (SWEGS) is proposed, which has a larger heat-exchange area of artificial reservoir created by fracturing hydrothermal technology. We find that, due to heat convection between rocks and fluid, the extracted thermal output for SWEGS is 4772.73 kW, which is 10.64 times of that of DBHE. By changing the injection water temperature, volume flow rate, and artificial reservoir volume, it is easy to adjust the extracted thermal output to meet the requirement of building thermal loads varying with outdoor air temperature. Understanding these will enable us to better apply SWEGS technology and solve the fog and haze problem easily and efficiently.
Databáze: Directory of Open Access Journals
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