A deep geothermal extraction system of three-layer deep borehole heat exchanger for cooling in summer and heating in winter

Wenqiang Zhao; Guobin Lei; Runsheng Ma; Zhengwei Wang; Xiaotong Song; Jiaqi Zhang

doi:10.1117/12.2634880

25 April 2022 A deep geothermal extraction system of three-layer deep borehole heat exchanger for cooling in summer and heating in winter

Wenqiang Zhao, Guobin Lei, Runsheng Ma, Zhengwei Wang, Xiaotong Song, Jiaqi Zhang

Author Affiliations +

Proceedings Volume 12244, 2nd International Conference on Mechanical, Electronics, and Electrical and Automation Control (METMS 2022); 122442D (2022) https://doi.org/10.1117/12.2634880
Event: 2nd International Conference on Mechanical, Electronics, and Electrical and Automation Control (METMS 2022), 2022, Guilin, China

Abstract

Although there is abundant geothermal energy in deep reservoirs, it is still a challenge to effectively extract the heat from hot dry rock (HDR) rather than the geofluid. In this research, a 800 m pipe is added to the 2000 m deep borehole heat exchangers (DBHE) to form a novel three-layer DBHE system. Through different operation modes, this system can realize heat extraction from the bottom of the well in winter and heat storage from the middle of the well in summer. Therefore, it is easy to use deep geothermal energy to achieve heating in winter and cooling in summer. For five consecutive years of numerical simulation results, this system can provide 191.6, 187.5, 185.2, 183.7 and 182.2 kW of heating in winter. On this basis, the cooling capacity of the system in summer is 49.5, 48.5, 48.2, 48.0 and 47.9 kW. In addition, cooling in summer can also improve the heating capacity of the subsequent winter by 1.4%-2.5% in five years. The energy storage efficiency also increases from 5.6% to 9.4%.

Citation Download Citation

Wenqiang Zhao, Guobin Lei, Runsheng Ma, Zhengwei Wang, Xiaotong Song, and Jiaqi Zhang "A deep geothermal extraction system of three-layer deep borehole heat exchanger for cooling in summer and heating in winter", Proc. SPIE 12244, 2nd International Conference on Mechanical, Electronics, and Electrical and Automation Control (METMS 2022), 122442D (25 April 2022); https://doi.org/10.1117/12.2634880

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KEYWORDS

Energy efficiency

Cooling systems

Geothermal energy

Performance modeling

3D modeling

High dynamic range imaging

Thermal effects

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