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

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Haijun Liang ◽  
Xiaofeng Guo ◽  
Tao Gao ◽  
Lingbao Wang ◽  
Xianbiao Bu
Keyword(s):  
Volume Flow Rate ◽  
Water Reservoir ◽  
Hot Water ◽  
Heat Extraction ◽  
Geothermal System ◽  
Enhanced Geothermal System ◽  
Artificial Reservoir ◽  
Reservoir Volume ◽  
Thermal Output ◽  
Single Well

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.

scholarly journals Performance of Hybrid Single Well Enhanced Geothermal System and Solar Energy for Buildings Heating

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2473
Author(s):  
Yujiang He ◽  
Xianbiao Bu
Keyword(s):  
Solar Energy ◽  
Service Life ◽  
Heating System ◽  
Hydrothermal Systems ◽  
Geothermal System ◽  
Heat Output ◽  
Enhanced Geothermal System ◽  
Geothermal Heat ◽  
Hybrid Heating ◽  
Single Well

The energy reserves in hot dry rock and hydrothermal systems are abundant in China, however, the developed resources are far below the potential estimates due to immature technology of enhanced geothermal system (EGS) and scattered resources of hydrothermal systems. To circumvent these problems and reduce the thermal resistance of rocks, here a shallow depth enhanced geothermal system (SDEGS) is proposed, which can be implemented by fracturing the hydrothermal system. We find that, the service life for SDEGS is 14 years with heat output of 4521.1 kW. To extend service life, the hybrid SDEGS and solar energy heating system is proposed with 10,000 m2 solar collectors installed to store heat into geothermal reservoir. The service life of the hybrid heating system is 35 years with geothermal heat output of 4653.78 kW. The novelty of the present work is that the hybrid heating system can solve the unstable and discontinuous problems of solar energy without building additional back-up sources or seasonal storage equipment, and the geothermal thermal output can be adjusted easily to meet the demand of building thermal loads varying with outside temperature.

Numerical investigation on heat extraction performance of an open loop geothermal system in a single well

Geothermics ◽  
2019 ◽  
Vol 80 ◽  
pp. 170-184 ◽  
Author(s):  
Gaosheng Wang ◽  
Xianzhi Song ◽  
Yu Shi ◽  
Baojiang Sun ◽  
Rui Zheng ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Open Loop ◽  
Heat Extraction ◽  
Geothermal System ◽  
Single Well ◽  
Extraction Performance

Numerical investigation on heat extraction performance of a CO2 enhanced geothermal system with multilateral wells

Energy ◽  
2018 ◽  
Vol 163 ◽  
pp. 38-51 ◽  
Author(s):  
Yu Shi ◽  
Xianzhi Song ◽  
Zhonghou Shen ◽  
Gaosheng Wang ◽  
Xiaojiang Li ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Heat Extraction ◽  
Geothermal System ◽  
Enhanced Geothermal System ◽  
Extraction Performance

Geothermal

2020 ◽  
pp. 363-402
Author(s):  
Paul F. Meier
Keyword(s):  
Pacific Ocean ◽  
Geothermal Energy ◽  
Power Plants ◽  
Hot Water ◽  
Geothermal System ◽  
Enhanced Geothermal System ◽  
Heating And Cooling ◽  
The Earth ◽  
The Pacific ◽  
The Pacific Ocean

Geothermal energy is heat taken from below the surface of the earth in the form of either steam or hot water. This energy can be used to generate electricity, but also has use in heating and cooling homes and some direct uses, such as gold mining, food dehydration, and milk pasteurizing. There are four basic types of geothermal power plants including steam, flash, binary, and enhanced geothermal system (EGS). The first three rely on permeable aquifers that have water flowing through them such that hot water or steam can be extracted. EGS, however, extracts heat from deep in the earth by injecting water and creating artificial fractures in the rock. A great deal of the world’s potential for geothermal energy exists in the so-called Ring of Fire, a ring of volcanoes around the Pacific Ocean.

Improving heat extraction performance of an enhanced geothermal system utilizing cryogenic fracturing

Geothermics ◽  
2020 ◽  
Vol 85 ◽  
pp. 101816
Author(s):  
Hongyuan Zhang ◽  
Zhongwei Huang ◽  
Shikun Zhang ◽  
Zheqi Yang ◽  
John D. Mclennan
Keyword(s):  
Heat Extraction ◽  
Geothermal System ◽  
Enhanced Geothermal System ◽  
Cryogenic Fracturing ◽  
Extraction Performance
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