Thermo-Hydro-Mechanical (THM) coupled simulations of innovative enhanced geothermal systems for heat and electricity production as well as energy storage PDF Download
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Author: Muhammad Haris
Publisher: Cuvillier Verlag
ISBN: 3736966601
Category : Science
Languages : en
Pages : 175
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Book Description
Enhanced geothermal systems (EGSs) evolved from the hot dry rock can provide a significant amount of energy while shifting towards negligible carbon emission. In order to investigate some important issues related to EGS, several scenarios have been analyzed using powerful numerical tools (FLAC3Dplus and TOUGH2MP-TMVOC). While conducting multiple hydraulic fracturing, it is observed that the newly created successive fracture’s configuration highly depends on the previous one under the influence of stress shadow. Therefore, the assumption of using similar multiple fracture geometries and shapes for energy exploitation may lead to erroneous estimations. A case study has been performed further using the engineering data of the GeneSys project in the North German Basin. Numerous scenarios have been investigated, and the optimized EGS project is proposed, whose installed power capacity of one side of the injection well declines from 7.17 MW to 5.08 MW over 30 years. Moreover, the Levelized cost of electricity is calculated at 5.46 c$/kWh, which is quite economical compared to the current electricity price. Finally, an innovative concept of regenerative EGS is proposed by storing surplus renewable energy in multiple hydraulic fractures that can reduce the reservoir temperature reduction rate. The results of continuous injection/production cycles depicted that a regenerative EGS could be achieved in reality.
Author: Muhammad Haris
Publisher: Cuvillier Verlag
ISBN: 3736966601
Category : Science
Languages : en
Pages : 175
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Book Description
Enhanced geothermal systems (EGSs) evolved from the hot dry rock can provide a significant amount of energy while shifting towards negligible carbon emission. In order to investigate some important issues related to EGS, several scenarios have been analyzed using powerful numerical tools (FLAC3Dplus and TOUGH2MP-TMVOC). While conducting multiple hydraulic fracturing, it is observed that the newly created successive fracture’s configuration highly depends on the previous one under the influence of stress shadow. Therefore, the assumption of using similar multiple fracture geometries and shapes for energy exploitation may lead to erroneous estimations. A case study has been performed further using the engineering data of the GeneSys project in the North German Basin. Numerous scenarios have been investigated, and the optimized EGS project is proposed, whose installed power capacity of one side of the injection well declines from 7.17 MW to 5.08 MW over 30 years. Moreover, the Levelized cost of electricity is calculated at 5.46 c$/kWh, which is quite economical compared to the current electricity price. Finally, an innovative concept of regenerative EGS is proposed by storing surplus renewable energy in multiple hydraulic fractures that can reduce the reservoir temperature reduction rate. The results of continuous injection/production cycles depicted that a regenerative EGS could be achieved in reality.
Author: Andrew D. Chiasson
Publisher: John Wiley & Sons
ISBN: 1118961943
Category : Technology & Engineering
Languages : en
Pages : 491
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Book Description
A unique approach to the study of geothermal energy systems This book takes a unique, holistic approach to the interdisciplinary study of geothermal energy systems, combining low, medium, and high temperature applications into a logical order. The emphasis is on the concept that all geothermal projects contain common elements of a "thermal energy reservoir" that must be properly designed and managed. The book is organized into four sections that examine geothermal systems: energy utilization from resource and site characterization; energy harnessing; energy conversion (heat pumps, direct uses, and heat engines); and energy distribution and uses. Examples are provided to highlight fundamental concepts, in addition to more complex system design and simulation. Key features: Companion website containing software tools for application of fundamental principles and solutions to real-world problems. Balance of theory, fundamental principles, and practical application. Interdisciplinary treatment of the subject matter. Geothermal Heat Pump & Heat Engine Systems: Theory and Practice is a unique textbook for Energy Engineering and Mechanical Engineering students as well as practicing engineers who are involved with low-enthalpy geothermal energy systems.
Author: Alexander Yakirevich
Publisher: MDPI
ISBN: 3039368966
Category : Science
Languages : en
Pages : 236
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Book Description
Groundwater is an essential and vital water resource for drinking water production, agricultural irrigation, and industrial processes. Having a better understanding of physical and chemical processes in aquifers enables more reliable decisions and reduces investments concerning water management. This Special Issue on “Water Flow, Solute, and Heat Transfer, in Groundwater” of Water focuses on the recent advances in groundwater dynamics, and it includes high-quality papers that cover a wide range of issues on different aspects related to groundwater: protection from contamination, recharge, heat transfer, hydraulic parameters estimation, well hydraulics, microbial community, colloid transport, and mathematical models. This integrative volume aims to transfer knowledge to hydrologists, hydraulic engineers, and water resources planners, who are engaged in the sustainable development of groundwater resources.
Author: Norihiro Watanabe
Publisher: Springer
ISBN: 3319465813
Category : Technology & Engineering
Languages : en
Pages : 109
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Book Description
This book focuses on numerical modeling of deep hydrothermal and petrothermal systems in fractured georeservoirs for utilization in Geothermal Energy applications. The authors explain the particular challenges and approaches to modeling heat transport and high-throughput flow in multiply fractured porous rock formations. In order to help readers gain a system-level understanding of the necessary analysis, the authors include detailed examples of growing complexity as the techniques explained in the text are introduced. The coverage culminates with the fully-coupled analysis of real deep geothermal test-sites located in Germany and France.
Author: Marc A. Rosen
Publisher: John Wiley & Sons
ISBN: 1119180988
Category : Technology & Engineering
Languages : en
Pages : 307
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Book Description
Comprehensively covers geothermal energy systems that utilize ground energy in conjunction with heat pumps to provide sustainable heating and cooling The book describes geothermal energy systems that utilize ground energy in conjunction with heat pumps and related technologies to provide heating and cooling. Also discussed are methods to model and assess such systems, as well as means to determine potential environmental impacts of geothermal energy systems and their thermal interaction. The book presents the most up-to-date information in the area. It provides material on a range of topics, from thermodynamic concepts to more advanced discussions of the renewability and sustainability of geothermal energy systems. Numerous applications of such systems are also provided. Geothermal Energy: Sustainable Heating and Cooling Using the Ground takes a research orientated approach to provide coverage of the state of the art and emerging trends, and includes numerous illustrative examples and case studies. Theory and analysis are emphasized throughout, with detailed descriptions of models available for vertical and horizontal geothermal heat exchangers. Key features: Explains geothermal energy systems that utilize ground energy in conjunction with heat pumps to provide heating and cooling, as well as related technologies such as thermal energy storage. Describes and discusses methods to model and analyze geothermal energy systems, and to determine their potential environmental impacts and thermal interactions. Covers various applications of geothermal energy systems. Takes a research orientated approach to provide coverage of the state of the art and emerging trends. Includes numerous illustrative examples and case studies. The book is key for researchers and practitioners working in geothermal energy, as well as graduate and advanced undergraduate students in departments of mechanical, civil, chemical, energy, environmental, process and industrial engineering.
Author: Roshan Poudel
Publisher:
ISBN: 9780438564626
Category : Geotechnical engineering
Languages : en
Pages : 122
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Book Description
With the growing national and international interest in alternative energy resources, geothermal energy has attracted more research attentions, especially in the west region of the United States, where many abundant geothermal resources are yet to be explored. Geothermal energy is gaining more supports throughout the world because it is an affordable and environmentally friendly source of heat. The research goal of this experimental study is to facilitate the application of enhanced geothermal system through the understanding of thermal effects on the geomechanical and hydraulic characteristics of a geothermal rock reservoir. A small-scale experiment was conducted using a geometric scale model of 1:6. Concrete was used to simulate the rock for experimental purposes. The concrete was prepared in slabs to simulate rock mass with two designed horizontal discontinuities. The simulated reservoir was instrumented with strain gauges to measure strain, thermocouples to measure temperature, and piezometers to measure pore water pressure. The reservoir was connected tightly to a water circulation system that was equipped with a valve, a flow meter, a digital circulating water bath, two thermocouples, two pressure meters, and a water pump. Based on a test matrix of a constant water flow rate, three injected water temperatures (i.e., 15°C, 25°C and 35°C) and three reservoir temperatures (i.e., 50°C, 60°C and 70°C), a minimum nine sequential experiments were conducted, starting with the lowest water and reservoir temperatures. All measurements, including strains, temperatures, water pressures, and displacements, were recorded as a function of experiment duration. The results show that strain, pore water pressure, and head loss are related to the temperature difference of injection water and reservoir.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Energy demand and production is a problem that countries around the world are facing nowadays, because meeting energy demands is necessary to improving quality of life. Geothermal energy is envisioned as a part of the integral solution to meet demand. Colombia, as with other countries, has the possibility of improving its base load capacity through geothermal resources. They have been found in several places where they can be developed and harnessed. Other countries with similar tectonic or volcanic activity can reach this resource. Because of the depths and the target geothermal gradient, the environment of an enhanced geothermal system (EGS) is found at high pressures and high temperatures. For this reason, mathematical models are necessary under these special pressures and temperatures conditions. Additionally analytical and numerical forecasts and predictions can become more accurate by using actual laws of behavior that consider temperature and pressure. Mechanical hydraulic fracturing laws can be improved, and current laws that explain general mechanical behavior do not describe all situations adequately. Indeed, coupled analyses can included these kinds of laws, which will improve general predictions. Numerical simulation is a powerful tool in the case of EGS because of the various scales of the problems, the localization, and the complexity of the coupled phenomena. Further research can be done that focuses on additional coupled processes, such as mechanical or chemical interactions. Moreover, numerical simulation tools can be used for forecasting and well management practices. They will improve the economic success of the geothermal project.
Author: Ibrahim Dincer
Publisher: Elsevier
ISBN: 0128208961
Category : Science
Languages : en
Pages : 527
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Book Description
Geothermal Energy Systems provides design and analysis methodologies by using exergy and enhanced exergy tools (covering exergoenvironmental, exergoeconomic, exergetic life cycle assessment, etc.), environmental impact assessment models, and sustainability models and approaches. In addition to presenting newly developed advanced and integrated systems for multigenerational purposes, the book discusses newly developed environmental impact assessment and sustainability evaluation methods and methodologies. With case studies for integrated geothermal energy sources for multigenerational aims, engineers can design and develop new geothermal integrated systems for various applications and discover the main advantages of design choices, system analysis, assessment and development of advanced geothermal power systems. Explains the ability of geothermal energy power systems to decrease global warming Discusses sustainable development strategies for using geothermal energy sources Provides new design conditions for geothermal energy sources-based district energy systems
Author: Bijay K C
Publisher:
ISBN:
Category : Geothermal brines
Languages : en
Pages : 0
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Book Description
A significant amount of thermal energy is present in the deep hot dry bedrocks, which can be tapped to provide clean and renewable energy for future generations. Due to very low permeability, the hot dry bedrock is artificially stimulated to create a network of engineered fractures and enhance the permeability for economic energy extraction. Such systems are known as Enhanced (or Engineered) Geothermal Systems (EGS). Usually, in EGS, cold water injected through the injection well(s) exchanges heat as it passes through the engineered fracture network in the hot dry bedrock; hot water is then extracted from the production well(s), which can be used for direct heating or electricity generation via a binary or flash-steam power cycle. Injection-induced shear stimulation, commonly known as 'hydro-shearing' is often implemented in EGS to enhance reservoir permeability. Hydro-shearing enhances the reservoir permeability due to self-propping of asperities present on the fracture surface during fracture slip. However, the fracture slip can result in a seismic event, one of the major public concerns related to development of EGS. Moreover, the coupled Thermal-Hydrological-Mechanical-Chemical (THMC) processes triggered due to fluid-fracture surface interactions in EGS reservoirs, reduces the fracture permeability leading to a decrease in production over time. Proppants, solid granular materials, can be used to prop open the fracture eliminating the necessity of fracture slip and hence minimizing the risk of induced seismicity. However, due to the limited application of proppants in EGS, our knowledge about proppants behavior and their long-term performance under EGS conditions is limited. In addition, perturbation in the state-of-stress acting on a fault (or fracture) in a reservoir due to operational activities such as stimulation/re-stimulation, injection, extraction, and water impoundment can also induce seismicity in a reservoir. In this study, we experimentally investigated (i) the impact of hydro-shearing on the fracture response to coupled THMC processes, (ii) the suitability of proppants to sustain the fracture permeability under EGS conditions, and (iii) fault/fracture reactivation due to stress perturbation in tensional and compressional faulting regime. The experimental results showed permanent permeability enhancement due to hydro-shearing. Hydro-shearing also resulted in enhanced mineral dissolution and gouge particles under EGS conditions. Proppants can be used to enhance the fracture permeability; however, the proppant can crush and embed on the fracture surface leading to permeability decline over time. In addition, the faults/fractures in extensional regime have higher affinity for slipping compared to the compressional regime. The insights from the experimental results in this study may be used to improve numerical and conceptual models of the EGS reservoir. For future experiments, it is recommended to use proppants at higher concentration and geothermal brine close to chemical equilibrium with rock (and proppants) minerals and more representative of field conditions to better understand the mechanical and chemical processes (dissolution/precipitation) affecting fracture permeability of EGS reservoir in long-term.
Author: Kwang Y. Lee
Publisher: MDPI
ISBN: 3039433601
Category : Technology & Engineering
Languages : en
Pages : 228
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Book Description
Faced with an ever-growing resource scarcity and environmental regulations, the last 30 years have witnessed the rapid development of various renewable power sources, such as wind, tidal, and solar power generation. The variable and uncertain nature of these resources is well-known, while the utilization of power electronic converters presents new challenges for the stability of the power grid. Consequently, various control and operational strategies have been proposed and implemented by the industry and research community, with a growing requirement for flexibility and load regulation placed on conventional thermal power generation. Against this background, the modelling and control of conventional thermal engines, such as those based on diesel and gasoline, are experiencing serious obstacles when facing increasing environmental concerns. Efficient control that can fulfill the requirements of high efficiency, low pollution, and long durability is an emerging requirement. The modelling, simulation, and control of thermal energy systems are key to providing innovative and effective solutions. Through applying detailed dynamic modelling, a thorough understanding of the thermal conversion mechanism(s) can be achieved, based on which advanced control strategies can be designed to improve the performance of the thermal energy system, both in economic and environmental terms. Simulation studies and test beds are also of great significance for these research activities prior to proceeding to field tests. This Special Issue will contribute a practical and comprehensive forum for exchanging novel research ideas or empirical practices that bridge the modelling, simulation, and control of thermal energy systems. Papers that analyze particular aspects of thermal energy systems, involving, for example, conventional power plants, innovative thermal power generation, various thermal engines, thermal energy storage, and fundamental heat transfer management, on the basis of one or more of the following topics, are invited in this Special Issue: • Power plant modelling, simulation, and control; • Thermal engines; • Thermal energy control in building energy systems; • Combined heat and power (CHP) generation; • Thermal energy storage systems; • Improving thermal comfort technologies; • Optimization of complex thermal systems; • Modelling and control of thermal networks; • Thermal management of fuel cell systems; • Thermal control of solar utilization; • Heat pump control; • Heat exchanger control.
