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Numerical And Experimental Study Of New Designs Of All Vanadium Redox Flow Batteries For Performance Improvement
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Book Synopsis Numerical and Experimental Study of New Designs of All-vanadium Redox Flow Batteries for Performance Improvement by : Mohammed Abdulkhabeer Ali Al-yasiri
Download or read book Numerical and Experimental Study of New Designs of All-vanadium Redox Flow Batteries for Performance Improvement written by Mohammed Abdulkhabeer Ali Al-yasiri and published by . This book was released on 2017 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Energy storage is envisioned as a key part of a renewable energy solution incorporated in a grid that overcomes two critical limits of renewable energy: intermittency and uncertainty. Among various technologies, a vanadium redox flow battery (VRFB) offers a promise because of its unique features such as long cycle life, separation of energy and power ratings, and capability of a deep discharge. The remaining challenges, however, include the limited application due to low energy density and complicated geometries. The complex geometry makes it difficult to optimize the performance and can cause a serious concern about leakage of the liquid. The goal of this dissertation is to resolve these challenges through modeling and experimental studies for newly-designed VRFB. The topic can be divided into three main efforts: flow field optimization by optimizing channels, new design for stability improvement and cost reduction, and a new concept of distributed VRFB. First, the effects of channel and length on battery performance were investigated based on 3D electrochemical models validated by experimental measurements. Second, to address the drawbacks of traditional VRFB, a new design has been introduced to increase reliability, reduce costs, and ease assembly. This battery has a small number of parts, which can more effectively prevent electrolyte leakage. Based on PVC (polyvinyl chloride) material, it solves the problem caused by electrolyte penetration by replacing existing graphite plate. Third, the development of a new distributed VRFB for transport systems addresses the problem of insufficient power, one of the main challenges of the flow system. This new technology is more efficient for space utilization, equal weight distribution, and fueling like a gasoline vehicle, reducing charge time"--Abstract, page iv.
Book Synopsis Redox Flow Batteries by : Huamin Zhang
Download or read book Redox Flow Batteries written by Huamin Zhang and published by CRC Press. This book was released on 2017-11-22 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow batteries have received attention in large-scale energy storage due to their flexible design, high safety, high energy efficiency, and environmental friendliness. In recent years, they have been rapidly developed and tested in a variety of scales that prove their feasibility and advantages of use. As energy becomes a global focus, it is important to consider flow battery systems. This book offers a detailed introduction to the function of different kinds of redox flow batteries, including vanadium flow batteries, as well as the electrochemical processes for their development, materials and components, applications, and near future prospects. Redox Flow Batteries: Fundamentals and Applications will give readers a full understanding of flow batteries from fundamentals to commercial applications.
Book Synopsis Numerical Modeling of an All Vanadium Redox Flow Battery by :
Download or read book Numerical Modeling of an All Vanadium Redox Flow Battery written by and published by . This book was released on 2014 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: We develop a capability to simulate reduction-oxidation (redox) flow batteries in the Sierra Multi-Mechanics code base. Specifically, we focus on all-vanadium redox flow batteries; however, the capability is general in implementation and could be adopted to other chemistries. The electrochemical and porous flow models follow those developed in the recent publication by [28]. We review the model implemented in this work and its assumptions, and we show several verification cases including a binary electrolyte, and a battery half-cell. Then, we compare our model implementation with the experimental results shown in [28], with good agreement seen. Next, a sensitivity study is conducted for the major model parameters, which is beneficial in targeting specific features of the redox flow cell for improvement. Lastly, we simulate a three-dimensional version of the flow cell to determine the impact of plenum channels on the performance of the cell. Such channels are frequently seen in experimental designs where the current collector plates are borrowed from fuel cell designs. These designs use a serpentine channel etched into a solid collector plate.
Book Synopsis Design, Construction, and Study of Performance Improvement in a Vanadium Redox Flow Battery by : Ya-Ching Tseng
Download or read book Design, Construction, and Study of Performance Improvement in a Vanadium Redox Flow Battery written by Ya-Ching Tseng and published by . This book was released on 2011 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Model-based Design and Optimization of Vanadium Redox Flow Batteries by : Sebastian König
Download or read book Model-based Design and Optimization of Vanadium Redox Flow Batteries written by Sebastian König and published by Cuvillier Verlag. This book was released on 2017-09-13 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, a holistic approach is used to develop a multi-physical model of the Vanadium Redox Flow Battery on a system level. The model is validated with experimental data from three flow battery manufacturers and is then deployed in an extensive parameter study for designing a flow battery cell. Using finite element analysis (FEA), twenty-four different cell designs are derived, which vary in electrode area and the design of the electrolyte inlet and outlet supply channels. The performance of the designs is then simulated in a single-stack and a three-stack string system. The presented model is also deployed in a flow rate optimization study. Here, a novel strategy involving the model-based optimization of operation-points defined by state-of-charge and charging or discharging current is presented and compared to conventional flow rate control strategies. Finally, a stack voltage controller is introduced, which prevents the violation of cell voltage limits as long as the pump capacity is not fully utilized.
Book Synopsis Experimental Characterisation and Modeling of a Vanadium Redox Flow Battery by : Mohd Rusllim Mohamed
Download or read book Experimental Characterisation and Modeling of a Vanadium Redox Flow Battery written by Mohd Rusllim Mohamed and published by . This book was released on 2013 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the summarization of work on experimental characterisation and modeling of a vanadium redox flow battery (V-RFB). This thesis presents background material and motivation factors of the studies; research goals, a review of previous work and discussion on related issues with respect to energy storage technologies, emphasising on V-RFB system. The aim of the study is to investigate the performance of V-RFB through experimental characterisation of V-RFB at different operating parameters and develop electrical circuit modeling of V-RFB. Preliminary experiment on 100 cm2 unit cell laboratory unit V-RFB has helped in familiarising with V-RFB setup and its design weaknesses and factors leading the cell into failure mode are highlighted. Based on observation on 100 cm2 unit cells, new design of 25 cm2 unit cell laboratory unit V-RFB has been proposed with an improvement of efficiency and reduction of contact resistance are observed. Theoretically studies by using Faraday's law of electrolysis and Nernst equation are used to relate the equilibrium cell's potential with the concentration changes in vanadium species, back-up with experimental data from a divided, open-circuit potentiometric cell approach. Two different approaches has been presented, with newly proposed approach of a divided, open-circuit potentiometric cell, via Hg/Hg2SO4 reference electrodes and graphite rod working electrodes present superiorities in estimating the state-of-charge (SOC) of V-RFB. System characterisation has been carried-out for the new 25 cm2 unit cell laboratory unit V-RFB under different of operating parameters such as current densities, temperatures, flow rates, concentrations and material properties. The cell exhibits highest energy efficiency at 82.1 %, operating at 308 K, 60 mA cm-2 current density and 3 cm3 s-1 volumetric flow rate for 250 cm3 (each reservoir) of 1.6 mol dm-3 V(III)/V(IV) in 4 mol dm-3 H2SO4. Formation charge of mixture of vanadium species into single electro-active species at positive and negative electrodes are highlighted. A method for estimating the V-RFB to complete its formation charge using electrochemical calculation of Faraday's constant are also presented. New equivalent electric circuit model for V-RFB has been proposed which consists of an open-circuit cell potential in series of ohmic internal resistance and the parallel n-RC network. Extended Kalman filter is used for parameter identification of dynamic characterisation of V-RFB. Numerical simulations are compared to experimental data at different pulse voltages at few SOCs and experimental charge-discharge characterisation of V-RFB system, demonstrating good agreement.
Book Synopsis Performance Modeling and Flow Rate Optimization of Vanadium Redox Flow Batteries by : Mayank Kale
Download or read book Performance Modeling and Flow Rate Optimization of Vanadium Redox Flow Batteries written by Mayank Kale and published by GRIN Verlag. This book was released on 2020-08-19 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master's Thesis from the year 2020 in the subject Engineering - Power Engineering, grade: 9.0, Indian Institute of Technology, Bombay, language: English, abstract: There is a drastic capacity increase in the ocean, solar, and wind power based energy generation in recent years. Moreover, a larger increase is predicted in future years. Hence, we need a reliable, efficient, and cost-effective energy storage system to match up with the intermittent nature of renewable energy sources. Vanadium redox flow batteries are a promising option and are fast approaching commercialization owing to their unique characteristics like including independent scaling of power and energy density. However, there are various losses associated with the membrane, electrodes, and also due to mass transfer which limit its performance and further decrease battery capacity and efficiency. The first part of this study focusses on membrane thickness, mass transfer coefficients, electrode morphology, and current density to analyze the performance of the battery. The latter part describes the effect of flow rate on concentration overpotential, pressure losses, and pumping power to come up with an optimal variable flow rate strategy to maximize the battery capacity and system efficiency.
Book Synopsis Experimental Study and Performance Characterization of a Single-cell Vanadium Redox Flow Battery by : Rabiul Islam
Download or read book Experimental Study and Performance Characterization of a Single-cell Vanadium Redox Flow Battery written by Rabiul Islam and published by . This book was released on 2016 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Validation of a two-dimensional model for vanadium redox-flow batteries by : Maik Becker
Download or read book Validation of a two-dimensional model for vanadium redox-flow batteries written by Maik Becker and published by Cuvillier Verlag. This book was released on 2020-05-11 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Redox-Flow batteries can play a crucial role in the future electricity supply in order to balance the time lag between the generation of electrical energy from photovoltaics or wind power and the demand for electrical energy. However, to deploy the technology on a large scale, significant cost reductions are required. A thorough knowledge of the reactions and processes taking place within a redox-flow battery is very helpful for this task and this knowledge can be significantly improved by using a suitable mathematical model to describe the processes in a single cell of a redox-flow battery. Nevertheless, this requires a valid model that has been compared with experimental data and that can reproduce these data plausibly and validly. In this thesis, the validation of a two-dimensional model for the description of potential and current density distributions in the porous electrodes of a vanadium redox-flow battery is presented, taking into account effects of kinetics and mass transport. Newly developed potential probes are used for in-situ measurement of solid and liquid phase potentials within a single cell of a vanadium redox-flow battery. The description of the measured cell voltage and potential probe signals by the model reveals a good congruence between the model and the experimental data, so the model can be regarded as valid. Additional suggestions for improvements of the model and the implementation of further models describing membrane crossover effects or electrolyte properties are given.
Book Synopsis Investigation of Localized Performance and Gas Evolution in All-vanadium Redox Flow Batteries Via In-situ Distributed Diagnostic Techniques by : Jason Thomas Clement
Download or read book Investigation of Localized Performance and Gas Evolution in All-vanadium Redox Flow Batteries Via In-situ Distributed Diagnostic Techniques written by Jason Thomas Clement and published by . This book was released on 2016 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: All-vanadium redox flow batteries (VRFBs) are an emerging grid-scale energy storage technology; however, enhancements in terms of performance, efficiency, durability, and cost are required before it can become commercially viable. These improvements are achievable through the development of advanced materials, superior architecture, and ultimately a deeper fundamental understanding of the influence of various phenomena and operational parameters on cell performance. There currently are a lack of in-situ experimental diagnostic techniques which can help in achieving this fundamental understanding. Two separate distributed diagnostic techniques were developed in this work: in-plane current distribution, and neutron radiography. Localized current distribution measurements can identify regions of reduced performance, and provide valuable insight regarding mass transport as a function of materials and design, and potentially localized degradation. A novel interpretation of the dimensionless Damkohler number was adapted to locally assess the relative contributions of kinetic and mass transport losses across the active area within an operating cell. Neutron radiography is an effective technique for the identification and quantification of individual phases within a two-phase fluid. This technique was implemented to determine the onset voltage of unwanted side reactions in an operating VRFB. Identification of such unfavorable operating conditions and limitations for different electrode materials can lead to a wider safe operating voltage window, which can be implemented to reduce charging times and improve cell efficiency. The successful demonstration of these techniques provides the field with two validated in-situ diagnostic techniques, advanced analysis, and benchmark data that can provide feedback for engineering enhanced materials, designs, and more optimal operating conditions for these cells, ultimately leading to enhanced fundamental understanding and improved performance.
Book Synopsis Study on Performance Enhancement of Vanadium Redox Flow Battery by Baffles in Serpentine Flow Channel by : 曾晹凱
Download or read book Study on Performance Enhancement of Vanadium Redox Flow Battery by Baffles in Serpentine Flow Channel written by 曾晹凱 and published by . This book was released on 2019 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flow Batteries written by Christina Roth and published by John Wiley & Sons. This book was released on 2022-12-06 with total page 1510 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow Batteries The premier reference on flow battery technology for large-scale, high-performance, and sustainable energy storage From basics to commercial applications, Flow Batteries covers the main aspects and recent developments of (Redox) Flow Batteries, from the electrochemical fundamentals and the materials used to their characterization and technical application. Edited by a team of leading experts, including the “founding mother of vanadium flow battery technology” Maria Skyllas-Kazacos, the full scope of this revolutionary technology is detailed, including chemistries other than vanadium and organic flow batteries. Other key topics covered in Flow Batteries include: Flow battery computational modeling and simulation, including quantum mechanical considerations, cell, stack, and system modeling, techno-economics, and grid behavior A comparison of the standard vanadium flow battery variant with new and emerging flow batteries using different chemistries and how they will change the field Commercially available flow batteries from different manufacturers, their technology, and application ranges The pivotal role of flow batteries in overcoming the global energy crisis Flow Batteries is an invaluable resource for researchers and engineers in academia and industry who want to understand and work with this exciting new technology and explore the full range of its current and future applications.
Book Synopsis Modeling of an All-vanadium Redox Flow Battery and Optimization of Flow Rates by :
Download or read book Modeling of an All-vanadium Redox Flow Battery and Optimization of Flow Rates written by and published by . This book was released on with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vanadium redox flow batteries (VRBs) are competitive for large energy storage systems due to low manufacture and maintenance costs and high design flexibility. Electrolyte flow rates have significant influence on the performance and efficiencies of the batteries. High electrolyte flow rates improve energy efficiency while degrade the battery efficiency due to high pump power losses. Thus, flow rates are necessary to be optimized for battery efficiency improvement. In this paper, an electrochemical model is firstly proposed to describe the charge-discharge characteristics based on the experimental data. Then, an empirical method is introduced to analyze the energy consumption of pumps under various flow rates. The optimal flow rates are obtained by applying new criteria. The results show that VRBs obtain peak battery efficiencies at the optimal flow rates around 90cm3s−1 with respect to the proposed battery configuration. The optimal flow rates are provided as a reference for battery operations and control.
Book Synopsis Energy Storage Devices by : M. Taha Demirkan
Download or read book Energy Storage Devices written by M. Taha Demirkan and published by BoD – Books on Demand. This book was released on 2019-12-18 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Energy storage will be a very important part of the near future, and its effectiveness will be crucial for most future technologies. Energy can be stored in several different ways and these differ in terms of the type and the conversion method of the energy. Among those methods; chemical, mechanical, and thermal energy storage are some of the most favorable methods for containing energy. Current energy storage devices are still far from meeting the demands of new technological developments. Therefore, much effort has been put to improving the performance of different types of energy storage technologies in the last few decades.
Download or read book ICCS21 written by Antonio J.M. Ferreira and published by Società Editrice Esculapio. This book was released on 2018-07-23 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is well-known that the topic of composite mate- rials affects many engineering fields, such as civil, mechanical, aerospace, automotive and chemical. In the last decades, in fact, a huge number of scientific papers concerning these peculiar constituents has been published. Analogously, the industrial progress has been extremely noticeable. The study of composite materials, in general, is a challenging activity since the advancements both in the academia and in the industry provide continually new sparks to develop innovative ideas and applications. The communication, the sharing and the exchange of views can surely help the works of many researchers. This aspect represents the main purpose of this Conference, which aims to collect high-level contributions on the development and the application of composite materials. The establishment of this 21st edition of International Conference on Composite Structures has appeared appropriate to continue what has been begun during the previous editions. ICCS wants to be an occasion for many researchers from each part of the globe to meet and discuss about the recent advancements regarding the use of composite structures, sandwich panels, nanotechnology, bio-composites, delamination and fracture, experimental methods, manufacturing and other countless topics that have filled many sessions during this conference. As a proof of this event, which has taken place in Bologna (Italy), selected plenary and key-note lectures have been collected in the present book.
Book Synopsis Fuel Cells: Technologies for Fuel Processing by : Dushyant Shekhawat
Download or read book Fuel Cells: Technologies for Fuel Processing written by Dushyant Shekhawat and published by Elsevier. This book was released on 2011-03-18 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fuel Cells: Technologies for Fuel Processing provides an overview of the most important aspects of fuel reforming to the generally interested reader, researcher, technologist, teacher, student, or engineer. The topics covered include all aspects of fuel reforming: fundamental chemistry, different modes of reforming, catalysts, catalyst deactivation, fuel desulfurization, reaction engineering, novel reforming concepts, thermodynamics, heat and mass transfer issues, system design, and recent research and development. While no attempt is made to describe the fuel cell itself, there is sufficient description of the fuel cell to show how it affects the fuel reformer. By focusing on the fundamentals, this book aims to be a source of information now and in the future. By avoiding time-sensitive information/analysis (e.g., economics) it serves as a single source of information for scientists and engineers in fuel processing technology. The material is presented in such a way that this book will serve as a reference for graduate level courses, fuel cell developers, and fuel cell researchers. Chapters written by experts in each area Extensive bibliography supporting each chapter Detailed index Up-to-date diagrams and full colour illustrations
Book Synopsis Electrochemical Engineering of All-vanadium Redox Flow Batteries for Reduced Ionic and Water Crossover Via Experimental Diagnostics and Multiscale Modeling by : Yasser Ashraf Gandomi
Download or read book Electrochemical Engineering of All-vanadium Redox Flow Batteries for Reduced Ionic and Water Crossover Via Experimental Diagnostics and Multiscale Modeling written by Yasser Ashraf Gandomi and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scalable and open architecture of redox flow batteries (RFBs) is a promising solution for large-scale energy storage. Among many chemistries developed for RFBs, all-vanadium redox flow batteries (VRFBs) currently show great potential for widespread commercialization. VRFBs utilize vanadium ions with different oxidation states in the negative and positive electrolytes; this characteristic frees them from irreversible capacity decay as a function of electroactive species transport through the membrane (i.e. crossover). However, crossover of vanadium ions and water during the charge/discharge cycling not only results in a lost discharge capacity, but also has real-time influence on the cell performance.Several parameters affect solute and solvent crossover during cycling. In this dissertation, experimental data along with multiscale computational modeling tailored to quantify the contributions to capacity decay stemming from ion-exchange membrane properties (e.g. equivalent weight and degree of reinforcement), flow field design, electrolyte properties, and operating conditions. A major focus has been to understand the effect of the electrode/membrane interface on the capacity decay and contact resistance. Novel ex-situ conductivity cells have been devised to assess ionic conductivity of the ion-exchange membranes along with electrolytes leading to details on the impact of interfacial phenomena on ionic conductivity and crossover.To quantify the long-term influence of crossover, a unique set-up (we call it IonCrG: Ionic Crossover Gauge) was built and fabricated enabling real-time measurement of the ionic transport across the polymeric membrane using ultraviolet-visible (UV/Vis) spectroscopy. The IonCrG enables separation of contributions to crossover emerging from concentration and electrostatic potential gradients. To investigate the instantaneous impact of crossover on the performance, a real-time current density distribution diagnostic has been implemented for measuring the in-plane current density distribution.The insights gained from this suite of experimental diagnostics and multiscale modeling have inspired design of systems with enhanced performance and greatly decreased crossover losses. Novel cell topologies along with asymmetric electrolyte compositions were designed and engineered for mitigating the ionic crossover during the operation of VRFBs. The cell architecture as well as the electrolyte configuration proposed in this dissertation provides an inexpensive and passive solution for retaining capacity during extended cycling of aqueous RFBs.
