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Performance Analysis of Single-Well Enhanced Geothermal System for Building Heating
Haijun Liang1,2, Xiaofeng Guo1,2, Tao Gao1,2
1SINOPEC Star Petroleum Co., Ltd. (Sinopec Star), Beijing 100083, China.
A novel single-well enhanced geothermal system (SWEGS) significantly boosts heat extraction compared to deep borehole heat exchangers (DBHE). SWEGS offers adjustable thermal output for diverse heating needs and potential environmental benefits.
Area of Science:
- Geothermal Energy Engineering
- Reservoir Engineering
- Environmental Engineering
Background:
- Deep borehole heat exchanger (DBHE) technology is versatile but limited by low rock thermal conductivity, hindering heat extraction efficiency.
- Conventional geothermal systems often rely on specific geological conditions like hot water reservoirs.
Purpose of the Study:
- To introduce and evaluate a single-well enhanced geothermal system (SWEGS) for improved geothermal heat extraction.
- To compare the thermal performance of SWEGS against traditional DBHE technology.
- To assess the adaptability of SWEGS for meeting variable building thermal loads.
Main Methods:
- Development of a single-well enhanced geothermal system (SWEGS) utilizing fracturing hydrothermal technology to create an artificial reservoir.
- Numerical or experimental analysis of heat extraction performance, considering heat convection between rocks and fluid.
- Parametric study involving injection water temperature, volume flow rate, and artificial reservoir volume.
Main Results:
- The proposed SWEGS demonstrated a significantly larger heat-exchange area due to the artificial reservoir.
- SWEGS achieved an extracted thermal output of 4772.73 kW, which is 10.64 times greater than that of DBHE.
- The system's thermal output is adjustable by modifying operational parameters, aligning with fluctuating building thermal demands.
Conclusions:
- SWEGS offers a substantial improvement in geothermal heat extraction efficiency over DBHE.
- The flexibility in adjusting thermal output makes SWEGS suitable for diverse and dynamic heating applications.
- SWEGS technology holds promise for efficient energy utilization and potential contributions to mitigating environmental issues like fog and haze.
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