Numerical evaluation of building heating potential from a co-axial closed-loop geothermal system using wellbore–reservoir coupling numerical model

Xu, Tianfu; Hu, Zixu; Feng, Bo; Feng, Guanhong; Li, Fengyu; Jiang, Zhenjiao

doi:10.1177/0144598719889799

Cited by 20 publications

(5 citation statements)

References 43 publications

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“…The lithological parameters used in the model are shown in Table 1. Among them, the porosity and permeability of fractures and matrix are set according to the models of Na and Xu [12,19], as the other parameters are set according to relevant heat transfer simulation work [36,37]. Initially, the reservoir was set to be homogeneous and isotropic.…”

Section: Lithologic Parametersmentioning

confidence: 99%

Reactive Transport Modeling of Chemical Stimulation Processes for an Enhanced Geothermal System (EGS)

Ma,

Cui,

Feng

et al. 2023

Energies

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An enhanced geothermal system is a kind of artificial geothermal system, which can economically exploit geothermal energy from deep thermal rock mass with low permeability by artificially created geothermal reservoirs. Chemical stimulation refers to a reservoir permeability enhancement method that injects a chemical stimulant into the fractured geothermal reservoir to improve the formation permeability by dissolving minerals. In this study, a reactive solute transport model was established based on TOUGHREACT to find out the effect of chemical stimulation on the reconstruction of a granite-hosted enhanced geothermal system reservoir. The results show that chemical stimulation with mud acid as a stimulant can effectively improve the permeability of fractures near the injection well, the effective penetration distance can reach more than 20 m after 5 days. The improvement of porosity and permeability was mainly caused by the dissolution of feldspar and chlorite. The permeability enhancement increased with the injection flow rate and HF concentration in the stimulant, which was weakly affected by the change in injection temperature. The method of chemical enhancement processes can provide a reference for subsequent enhanced geothermal system engineering designs.

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Section: Lithologic Parametersmentioning

confidence: 99%

Reactive Transport Modeling of Chemical Stimulation Processes for an Enhanced Geothermal System (EGS)

Ma,

Cui,

Feng

et al. 2023

Energies

Self Cite

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“…Therefore, intermittent operation of geothermal wells can obtain better heat removal effect. Therefore, the intermittent operation of geothermal wells can obtain a better heat extraction effect 41 …”

Section: Application Of the Modelmentioning

confidence: 99%

“…Therefore, the intermittent operation of geothermal wells can obtain a better heat extraction effect. 41…”

Section: Type Curve Analysismentioning

confidence: 99%

Research on economic length of the horizontal section of downhole coaxial heat exchanger geothermal system based on net present value

Xiao

Cai

Tang

et al. 2021

Intl J of Energy Research

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Summary Hot dry rocks (HDRs) exhibit wide distribution characteristics and have attracted considerable attention because of their considerable potential for geothermal development. A downhole coaxial heat exchanger geothermal system (DCHEGS) with a horizontal well is a novel and effective method for geothermal development and utilization from HDR. To examine the heat extraction performance, a mathematical model of a DCHEGS was established. This model was extremely accurate and consistent with the experimental test results (relative errors were <8%). By analyzing calculation results, we determined that the heat extraction power increased with the horizontal section length; however, the growth rate decreased. Hence, there must be an economical horizontal section length. Subsequently, to identify the optimal length of horizontal section, an economic evaluation model of a DCHEGS with a horizontal well based on net present value (NPV) was established. Finally, the economic evaluation model was applied using the GR1 Well as an example. The results demonstrated that the project can only be profitable when the horizontal section length of the GR1 Well is between 0 and 4009 m, and the optimal economic length is 1466 m. Thus, in this study, the horizontal well length design method proposed can effectively provide a theoretical support for the practical design and operation of DCHEGS.

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“…Geothermal energy can be used for building heating. Xu et al (2020b) developed a mixed convective-conductive fluid-flow model of a co-axial closed-loop geothermal system to investigate its heat extraction performance for heating. It was found that a geothermal well could provide enough heat for a building with an area of 10,000-20,000 m 2 .…”

Section: Energy Savings Through Renewable Energy Usagementioning

confidence: 99%

Building integrated renewable energy

Lin

Wang

Hao

et al. 2020

Energy Exploration & Exploitation

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About one-third of the primary energy in the world is consumed by buildings. A large amount of CO2 emission due to building energy consumption has threatened the sustainable development of the world. Improvement on the building energy performance, especially by integration with renewable energy resources has attracted interest worldwide to reduce greenhouse gas emission to make our society more sustainable. This Special Issue on building integrated renewable energy was open to all contributors in the field of building energy efficiency. The original experimental studies, numerical simulations, and reviews in all aspects of renewable energy utilization, management, and optimization have been considered. In the event, all these topics were covered in the extensive submissions accepted, but interesting papers on other aspects of building energy efficiency were also received. The purpose of this editorial is to summarize the main research findings of accepted papers in this Special Issue, including the use of renewable energy and energy saving technologies in buildings and identify a number of research questions and research directions.

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Numerical evaluation of building heating potential from a co-axial closed-loop geothermal system using wellbore–reservoir coupling numerical model

Cited by 20 publications

References 43 publications

Reactive Transport Modeling of Chemical Stimulation Processes for an Enhanced Geothermal System (EGS)

Reactive Transport Modeling of Chemical Stimulation Processes for an Enhanced Geothermal System (EGS)

Research on economic length of the horizontal section of downhole coaxial heat exchanger geothermal system based on net present value

Building integrated renewable energy

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