Download or read book Particle scale Simulations for Geothermal Energy Applications written by Faras Al Balushi and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geothermal energy has the potential to develop into a reliable source of clean and renewable energy due to its widespread availability and minimal carbon dioxide emission during electricity generation. Due to the high temperature of such reservoirs, technologies are continuously being developed to reduce the cost of extracting heat and extend the lifetime of the geothermal systems for profitable heat production. One of the main challenges hindering the further development of geothermal systems is the low heat extraction efficiency characterized by low-temperature produced fluids. In enhanced geothermal systems, where fluid injected flows directly through the geothermal formation, thermal breakthrough or "short-circuiting" causes fast cooling of the geothermal formation due to the presence of shortcut paths connecting the injector well to the producer well. Such an occurrence may lead to the temporary shutdown of the geothermal plant, leaving an enormous amount of untapped heat behind. Efforts to tackle this issue have been focused on delaying thermal breakthrough rather than achieving uniform heat sweeping from the geothermal systems. No technologies or methods are currently available to achieve uniform heat extraction from EGS. To fill this gap, we propose a novel concept of temperature-sensitive proppants to achieve self-adjustable fracture conductivity. Through particle-scale numerical simulations, we evaluate the performance of such proppants for different operating conditions and material properties. My numerical results showed that the permeability of such proppants is affected by in-situ conditions, material properties, and geometric properties. The developed model can be utilized to comprehensively understand the performance of such temperature-sensitive proppants at different operating conditions. Field-scale simulations confirmed the feasibility of using the proposed temperature-sensitive proppants in enhancing heat extraction from EGS by ~50% over 50 years of production when the proposed proppants are used compared to typical proppants with no temperature dependency. Alternatively, closed-loop geothermal systems can be considered, where the working fluid is circulated inside the wellbore. The heat exchange efficiency of such systems is typically low, which limits the use of the produced heat for direct heating applications. In this study, we introduce a method of improving heat exchange between the wellbore and the geothermal formation utilizing coated proppants. Based on numerical simulations, the enhancement of proppant thermal conductivity is discussed. Particle-scale analysis showed that coating sand proppants with a thin layer of copper coating may increase its effective thermal conductivity seven times. Increasing proppant particulate coating thickness further increases the effective thermal conductivity by an order of magnitude. In addition, smaller proppants showed higher effective thermal conductivity compared to larger proppants due to the increased contact with the neighboring particles, resulting in lower resistance to heat conduction. Such conductive proppants can enhance heat conduction between the geothermal formation and the wellbore, increasing the heat extraction efficiency of closed-loop geothermal systems. Drilling costs account for the majority of the cost of developing a geothermal system. During drilling, thief zones (permeable zones) may be encountered. Moreover, fractures may be induced due to the high circulating density of the drilling fluid. If such fractures are left unplugged, excessive fluid loss may occur, which may cause well instability issues or may lead to losing the well in extreme cases. Using lost circulation material (LCM) is a cheap and effective way to prevent further drilling fluid loss to the formation. Granular particles are typically used due to their cost and their ability to form a tight and stable seal. Understanding the performance of such particles after bridging is essential to ensure their stability under fluctuating operating conditions. Here, the sealing performance of granular particles after bridging is discussed. Our analysis revealed that the shape of the particles is one of the most influential factors that impact the sensitivity of such particles to closure stress. Furthermore, the sensitivity of the particle pack permeability to friction is influenced by the particle shape. Numerical simulations offer considerable advantages over laboratory experiments, especially for geothermal systems due to the difficulty in accurately reproducing the elevated temperature. In this study, different numerical tools are utilized to model and design particulates that can enhance the heat extraction efficiency of both open- and closed-loop geothermal systems. Using numerical simulations allows easier control of the design parameters as well as operating conditions to avoid repetitive and costly laboratory experiments that may require different samples from different vendors. The numerical workflow used is validated against laboratory experiments and analytical as well as empirical equations.
Download or read book Geothermal Energy Update written by and published by . This book was released on 1978 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geoenergy Modeling III written by Norihiro Watanabe and published by Springer. This book was released on 2016-11-10 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-06 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Simulation for Next Generation Thermal Power Plants written by Falah Alobaid and published by Springer. This book was released on 2018-03-29 with total page 431 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides highly specialized researchers and practitioners with a major contribution to mathematical models’ developments for energy systems. First, dynamic process simulation models based on mixture flow and two-fluid models are developed for combined-cycle power plants, pulverised coal-fired power plants, concentrated solar power plant and municipal waste incineration. Operation data, obtained from different power stations, are used to investigate the capability of dynamic models to predict the behaviour of real processes and to analyse the influence of modeling assumptions on simulation results. Then, a computational fluid dynamics (CFD) simulation programme, so-called DEMEST, is developed. Here, the fluid-solid, particle-particle and particle-wall interactions are modeled by tracking all individual particles. To this purpose, the deterministic Euler-Lagrange/Discrete Element Method (DEM) is applied and further improved. An emphasis is given to the determination of inter-phase values, such as volumetric void fraction, momentum and heat transfers, using a new procedure known as the offset-method and to the particle-grid method allowing the refinement of the grid resolution independently from particle size. Model validation is described in detail. Moreover, thermochemical reaction models for solid fuel combustion are developed based on quasi-single-phase, two-fluid and Euler-Lagrange/MP-PIC models. Measurements obtained from actual power plants are used for validation and comparison of the developed numerical models.
Download or read book Geoenergy Modeling I written by Norbert Böttcher and published by Springer. This book was released on 2016-06-27 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: This introduction to geothermal modeling deals with flow and heat transport processes in porous and fractured media related to geothermal energy applications. Following background coverage of geothermal resources and utilization in several countries, the basics of continuum mechanics for heat transport processes, as well as numerical methods for solving underlying governing equations are discussed. This examination forms the theoretical basis for five included step-by-step OpenGeoSys exercises, highlighting the most important computational areas within geothermal resource utilization, including heat diffusion, heat advection in porous and fractured media, and heat convection. The book concludes with an outlook on practical follow-up contributions investigating the numerical simulation of shallow and deep geothermal systems.
Download or read book Exploratory Potential Methods in Geothermal Power Generation written by Willi Freeden and published by Springer Nature. This book was released on 2024 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides the geoscientific context, that arises in gravimetric/magnetometric exploration. It essentially uses mathematics as a key technology for modeling issues on the basis of analysis and interpretation according to dense and precise gravitational/magnetic measurements. It is dedicated to surface and deep geology with potential data primarily of terrestrial origin. The book spans the interdisciplinary arc from geoengineering, especially geodesy, via geophysics to geomathematics and geology, and back again. It presents the recently published pioneering and groundbreaking multiscale mollifier methodologies realizing the bridging transfer from gravitational/magnetic measurements to approximative/numerical mollifier wavelet decorrelations with novel geologic prospects and layer-structure determination as outcome. Using the specific example of the German Saarland region, new important fields of application, especially for areas with mining-related cavities, will be opened up and subjected to an in-depth geologic detection.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanofluids written by Mohammad Mehdi Rashidi and published by Elsevier. This book was released on 2024-07-26 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanofluids are a new class of heat transfer fluids engineered by dispersing and stably suspending nanoparticles in traditional heat transfer fluids. Recently they have obtained global attention from the scientific community owing to their unique properties and significant applications in different engineering fields. Nanofluids: Preparation, Applications and Simulation Methods provides a comprehensive review of recent advances in this important research field. Different approaches for preparing some remarkable families of nanofluids such as aluminum oxide-based nanofluids, CuO/Cu-based nanofluids, carbon nanotubes/graphene-based nanofluids, ZnO-based nanofluids, Fe3O4-based nanofluids, and SiO2-based nanofluids are discussed in detail as well as their current and potential applications. Different approaches for numerical, semi-analytical and analytical simulations are also discussed including molecular dynamics, the Lattice Boltzmann method, and spectral methods, as well as advanced analytical techniques such as the Differential Transform Method, the Homotopy Analysis Method, and Optimal Homotopy Analysis. The book will be a valuable reference resource for academic and industrial researchers, materials scientists and engineers, nanotechnologists, and chemists working in the development of nanomaterials and nanofluids for heat transfer in energy and engineering applications. Covers the synthesis of nanostructures, preparation of nanofluids, different applications and proposed models for fluid mechanics and heat transfer Presents recent advances on preparation methods, including green chemistry-based methods for preparation of nanomaterials and nanofluids Includes novel model-based approaches such as molecular dynamics and Lattice Boltzmann methods Delves into applications in renewable energy technologies and thermal management Contains a Semi-analytical approach for solving Time-Fractional Navier-Stokes Equation
Download or read book Energy a Continuing Bibliography with Indexes written by and published by . This book was released on 1978 with total page 838 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1991 with total page 938 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Role of Mathematical Modeling in Advanced Power Generation Systems written by Arijit Ganguli and published by Frontiers Media SA. This book was released on 2023-11-13 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: Energy demands throughout the globe has been increasing and the detrimental effects of carbon emissions on the environment by use of non-renewable resources has impacted life on the planet. The changing climate has caused an increase in natural calamities all over the globe. Many countries in the world have started to produce power using renewable resources like solar, biomass, wind energy, nuclear energy and green fuels. Though there are several technologies for power generation using the above sources, efficient design of these systems still needs lot of research. Mathematical modeling would play a vital role in design of state of the art technologies. Advanced nuclear power plants need special mention since they involve naturally driven safety systems where the complex phenomena of boiling, condensation and thermal stratification take place. These are difficult to model as there is more than one phase coupled with turbulence models, near wall phenomena, coalescence and break up, etc. Scaling up of such systems and their innovative design to reduce stratification requires the help of mathematical modeling. Other opportunities include Computational Fluid Dynamics (CFD) modeling for design of wind turbines for power generation using wind energy. Power generation from biomass involves use of gasifiers which has complex set of reactions and mostly two or three phases which are difficult to model using CFD at industrial scales.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1980 with total page 1056 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report summaries written by United States. Environmental Protection Agency and published by . This book was released on 1983 with total page 1584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mathematics Advances in Research and Application 2012 Edition written by and published by ScholarlyEditions. This book was released on 2012-12-26 with total page 1637 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematics—Advances in Research and Application: 2012 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Mathematics. The editors have built Mathematics—Advances in Research and Application: 2012 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Mathematics in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Mathematics—Advances in Research and Application: 2012 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
