Tesis sobre el tema "Power-to-fuel"
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Moore, Christopher Wayne. "Microfabricated Fuel Cells To Power Integrated Circuits". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7106.
Texto completoGonzález, Guerrero MªJosé. "Enzymatic microfluidic fuel cells: from active to passive power sources". Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/322082.
Texto completoThis thesis presents the development and fabrication of microfluidic fuel cells for low power and portable applications. Specifically, biological fuel cells that use enzymes for glucose degradation. This work is divided in two sections depending on whether the fabricated devices are active, i. e. the reagents are supplied into the micro fuel cell by pumping (Chapters 2 and 3). If, on the contrary, the reagents flow without needing external mechanisms they are passive devices (Chapters 4 and 5). In the first chapter of the thesis the first approach in the development of glucose/O2 micro fuel cells was conducted in order to allow for the initial electrochemical measurements with enzymes. The microfluidic fuel cell was fabricated using a glass substrate in which gold electrodes were impressed using microfabrication techniques. On the other hand, soft lithography was used to fabricate the Y-shaped PDMS channels. This channel shape enabled to flow two solutions in parallel using a syringe pump. The enzymes were continuously flowing through the channel causing expensive experiments in addition to hindering its possible portable application. Thereby, the biocatalysts immobilization on the electrodes was next addressed in this thesis. Chapter 2 presents the fabrication of a micro fuel cell with enzymes trapped on the electrode surfaces which lead to an effective use of the biocatalysts. The electrodes were fabricated using pyrolyzed resists and were successfully used for the first time in enzymatic microfluidic fuel cells of this kind. The fuel cell was formed by different layers of plastic laminated materials cut using a cutter plotter. This promotes a fast and inexpensive device fabrication which is compatible with large scale manufacturing. The microfluidic channel was also defined on this type of plastic materials, thus avoiding the long lithographic process related to the PDMS. Moreover, this Y-shaped channel allows to optimize the power obtained from the fuel cell when two different solution are pumped into the system. Therefore, the following aspect to be addressed was the biocatalyst immobilization over the electrodes of the micro fuel cell Chapter 4 describes the construction of a microfluidic fuel cell fabricated using paper substrates. The reagents flow through this paper (in a passive way) by capillary action. The fuel cell components were cut using a cutting plotter which allows fabricating devices much faster. The proper functioning of this paper-based microfluidic fuel cell was verified obtaining similar power values to those presented in Chapter 3 (were solution were pumped). From here, the work focused on bringing the paper fuel cell closer to the simplicity of lateral flow tests. The fuel cell was then adapted and successfully operated using a single solution, generating energy from a commercial drink. Chapter 5 presents a microfluidic paper-based fuel cell smaller and more sophisticated than the one presented in previous chapter. A new combination of enzyme was tested which allowed to work with samples at neutral pH. Additionally, the compact size of the system opened the possibility to operate the paper fuel cell with physiological fluids, such as blood. Finally, it was demonstrated that was possible to have a fuel cell ready to fed devices demanding low energy. However, more efforts have to be done in the field to approach this fuel cell to a real world mainly due to the still limited lifetime of the enzymes.
Carlson, Amy L. "Applying fuel cells to data centers for power and cogeneration". Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/1366.
Texto completoLiu, Jianxing. "Contributions to Adaptative Higher Order Sliding Mode Observers : Application to Fuel Cell an Power Converters". Thesis, Belfort-Montbéliard, 2014. http://www.theses.fr/2014BELF0232/document.
Texto completoAutomotive PEM Fuel Cell systems rely upon a set of auxiliary systems for proper operation, such as humidifier, air-feed compressor, power converter etc. The internal physical states of the latter are often unmeasurable, yet required for their precise control. Observers provide a means of obtaining the unmeasured states of these auxiliary systems for feedback control, optimal energy consumption and Fault Diagnosis and Isolation (FDI). This thesis is based on higher order sliding mode observer design studies for two major PEMFC auxiliary systems found in modern automobiles, the air-feed system and the power electronics system.The first part is focused on robust observation and FDI of the PEMFC air-feed systems. Sliding mode observer design and their applications to FDI have been studied in detail for this purpose and the key observation problems in this system have been identified. Based on this study, two solutions are proposed, a sliding mode algebraic observer for oxygen and nitrogen partial pressures and a novel robust adaptive-gain Second Order Sliding Mode (SOSM) observer based FDI for simultaneous state observation, parameter identification, health monitoring and fault reconstruction of the PEMFC air-feed system. The performance of the proposed observers has been validated on an instrumented Hardware-In-Loop (HIL) test bench.The observation and output feedback control problems of different power electronic converters, commonly found in fuel cell vehicles, are addressed in the next part. Robust output feedback SOSM control for three phase AC/DC converters have been presented. A robust SOSM observer for multi-cell converters has also been designed. The performance of all these designs has been demonstrated through a multi-rate simulation approach. The results highlight the robustness of the observers and controllers against parametric uncertainty, measurement noise and external disturbance
Staniforth, J. "The use of biogas to power a small tubular solid oxide fuel cell". Thesis, Keele University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311728.
Texto completoChoi, Woojin. "New approaches to improve the performance of the PEM based fuel cell power systems". Texas A&M University, 2004. http://hdl.handle.net/1969.1/2752.
Texto completoBeccherle, Julien. "Feasibility and economics of existing PWR transition to a higher power core using annular fuel". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/44776.
Texto completoIncludes bibliographical references (p. 135).
The internally and externally cooled annular fuel is a new type of fuel for PWRs that enables an increase in core power density by 50% within the same or better safety margins as the traditional solid fuel. Each annular fuel assembly of the same side dimensions as the solid fuel has 160 annular fuel rods arranged in a 13x13 array. Even at the much higher power density, the fuel exhibits substantially lower temperatures and a MDNBR margin comparable to that of the traditional solid fuel at nominal (100%) power. The major motivation for such an up-rate is reduction of electricity generation cost. Indeed, the capital cost per kWh(e) of the construction is smaller than the standard construction of a new reactor with solid fuel. Elaborating on previous work, we study the economic payoff of such an up-rate of an existing PWR given the expected cost of equipment and also cost of money using different assumptions. Especially, the fate of the already bought solid fuel is investigated. It is demonstrated that the highest return on investment is obtained by gradually loading annular fuel in the reactor core such that right before shutting the reactor down for the up-rate construction, two batches in the core are of annular fuel. This option implies running a core with a mixture of both annular fuel and solid fuel assemblies. In order to prove the technical feasibility of such an option, the thermal-hydraulics of this mixed core is investigated and the Minimum Departure From Nucleate Boiling is found to be either unaffected or even improved by using a mixed core. Consequently, a neutronic model is developped to verify and validate the neutronic feasibility of the transition from solid fuel to annular fuel.
(cont.) The overall conclusion of this work is that annular fuel is a very promising option for existing reactors to increase by 50% their power, because it enables such an uprate at very attractive return on investement. We show that, by a smart management of the transition, a return on investment of about 22 to 27 % can be achieved.
by Julien Beccherle.
S.M.
Jarvis, Christina M. "An evaluation of the wildlife impacts of offshore wind development relative to fossil fuel power production". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 0.67 Mb., 123 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:1430770.
Texto completoSALOMONE, FABIO. "Addressing the challenges of the Power-to-Fuel technologies from a catalyst development and techno-economic point of view". Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2907012.
Texto completoGustafson, Michael K. "A Computational Approach to Simulating the Performance of a 24-Hour Solar-Fuel Cell-Hydrogen Electric Power Plant". Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1369357154.
Texto completoHenke, Moritz [Verfasser] y Andreas [Akademischer Betreuer] Friedrich. "Pressurised solid oxide fuel cells : from electrode electrochemistry to hybrid power plant system integration / Moritz Henke. Betreuer: Andreas Friedrich". Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2016. http://d-nb.info/1082538108/34.
Texto completoSmith, Aimée. "Multi-criteria decision making approach to optimization of fuel-mix choice for electric power generation under environmental impact constraints". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0035/MQ57739.pdf.
Texto completoSmith, Aimee Carleton University Dissertation Engineering Civil and Environmental. "Multi-criteria decision making approach to optimization of fuel-mix choice for electric power generation under environmental impact constraints". Ottawa, 2000.
Buscar texto completoZavadil, Jan. "Sezónní akumulace využívající technologii power-to-gas". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417449.
Texto completoArsalis, Alexandros. "Thermoeconomic Modeling and Parametric Study of Hybrid Solid Oxide Fuel Cell – Gas Turbine – Steam Turbine Power Plants Ranging from 1.5 MWe to 10 MWe". Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/31005.
Texto completoMaster of Science
Rancruel, Diego Fernando. "Dynamic Synthesis/Design and Operation/Control Optimization Approach applied to a Solid Oxide Fuel Cell based Auxiliary Power Unit under Transient Conditions". Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/26277.
Texto completoPh. D.
Williams, Brian C. "The development of the eclipse process simulator and its application to the techno-economic assessment of fossil fuel based power generation technologies". Thesis, University of Ulster, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260623.
Texto completoCopek, Tomáš. "Ukládání elektrické energie do výhřevných plynů". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241877.
Texto completoJung, Jin Woo. "Modeling and control of fuel cell based distributed generation systems". Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1116451881.
Texto completoTitle from first page of PDF file. Document formatted into pages; contains xvi, 209 p.; also includes graphics. Includes bibliographical references (p. 202-209). Available online via OhioLINK's ETD Center
Garcia, Arregui Marcos. "Theoretical study of a power generation unit based on the hybridization of a fuel cell stack and ultracapacitors : application to the design of an aircraft emergency electrical network". Toulouse, INPT, 2007. http://ethesis.inp-toulouse.fr/archive/00000521/.
Texto completoThe presented work deals with the design and conception of an electrical network from a fuel cell stack and its associated storage device. The framework of this project is an aeronautical and transport application. Air pressurized fuel cell stacks need some auxiliary devices that permits a correct gas flow through the fuel cell stack. Due to the auxiliary devices, the fuel cell dynamics performances may be limited, and a power buffer is required to support power peaks. Furthermore, hybridization has a positive effect in the system size, and can lead to reduce the global system weight and volume. Ultracapacitos seem to be well adequate for this purpose. Due to the transport application, the system hydrogen consumption, volume, weight and cost are essential parameters. Due to the transport application, the system hydrogen consumption, volume, weight and cost are sizing essential parameters. Therefore a global system optimization seems mandatory in this cas
Garcia, Arregui Marcos Astier Stéphan Turpin Christophe. "Theoretical study of a power generation unit based on the hybridization of a fuel cell stack and ultracapacitors application to the design of an aircraft emergency electrical network /". Toulouse : INP Toulouse, 2008. http://ethesis.inp-toulouse.fr/archive/00000521.
Texto completoTshamala, Mubenga Carl. "Simulation and control implications of a high-temperature modular reactor (HTMR) cogeneration plant". Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86264.
Texto completoENGLISH ABSTRACT: Traditionally nuclear reactor power plants have been optimised for electrical power generation only. In the light of the ever-rising cost of dwindling fossil fuel resources as well the global polluting effects and consequences of their usage, the use of nuclear energy for process heating is becoming increasingly attractive. In this study the use of a so-called cogeneration plant in which a nuclear reactor energy source is optimised for the simultaneous production of superheated steam for electrical power generation and process heat is considered and analysed. The process heat superheated steam is generated in a once-through steam generator of heat pipe heat exchanger with intermediate fluid while steam for power generation is generated separately in a once-through helical coil steam generator. A 750 °C, 7 MPa helium cooled HTMR has been conceptually designed to simultaneously provide steam at 540 °C, 13.5 MPa for the power unit and steam at 430 °C, 4 MPa for a coal-to-liquid fuel process. The simulation and dynamic control of such a typical cogeneration plant is considered. In particular, a theoretical model of a typical plant will be simulated with the aim of predicting the transient and dynamic behaviour of the HTMR in order to provide guideline for the control of the plant under various operating conditions. It was found that the simulation model captured the behaviour of the plant reasonably well and it is recommended that it could be used in the detailed design of plant control strategies. It was also found that using a 1500 MW-thermal HTMR the South African contribution to global pollution can be reduced by 1.58%.
AFRIKAANSE OPSOMMING: Tradisioneel is kernkragaanlegte vir slegs elektriese kragopwekking geoptimeer. In die lig van die immer stygende koste van uitputbare fossielbrandstohulpbronne asook die besoedelingsimpak daarvan wêreldwyd, word die gebruik van kernkrag vir prosesverhitting al hoe meer aanlokliker. In hierdie studie word die gebruik van ‘n sogenaamde mede-opwekkingsaanleg waarin ‘n kernkragreaktor-energiebron vir die gelyktydige produksie van oorverhitte stoom vir elektriese kragopwekking en proseshitte oorweeg ontleed word. Die oorvehitte stoom word in ‘n enkeldeurvloei-stoomopwekking van die hittepyp-hitteruiler met tussenvloeistof opgewek en stoom vir kragopwekking word apart in ‘n enkeldeurvloei-spiraalspoel-stoomopwekker opgewek. ‘n 750 °C, 7 MPa heliumverkoelde HTMR is konseptueel ontwerp vir die gelytydige veskaffing van stoom by 540 °C, 13.5 MPa, vir die kragopwekkings eenheid, en stoom by 430 °C, 4 MPa, vir ‘n steenkool-tot-vloeibare (CTL) brandstoff proses. Die simulasie en dinamiese beheer van ‘n tipiese HTMR mede-opwekkingsaanleg word beskou. ‘n die besonder word ‘n teoretiese model van die transiënte en dinamiese gedrag van die aanleg gesimuleer om sodoene riglyne te identifiseer vir die ontwikkeling van dinamiese beheer strategië vir verskillende werkstoestande van die aanleg. Daar was ook gevind dat die simulasie model van die aanleg se gedrag goed nageboots word en dat dit dus gebruik kan word vir beheer strategie doeleindes. Indien so ‘n 1500 MW-termies HTMR gebruik word sal dit die Suid Afrikaanse besoedling met 1.58% sal kan verminder.
Joo, Choonshik y Martin Stangl. "Application of Power Regenerative Boom system to excavator". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200461.
Texto completoFillis, Vernon W. "First Order Assessment of Heat Transfer due to the Loss of Inventory in a Spent Fuel Pool". Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29599.
Texto completoMitchell, Catherine. "The renewable non-fossil fuel obligation : a case study of the barriers to energy technology development". Thesis, University of Sussex, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240632.
Texto completoDel, Barga Christopher. "Design and Optimization of a Mobile Hybrid Electric System to Reduce Fuel Consumption". Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/76797.
Texto completoMaster of Science
Zhang, Yusheng. "Development of a bench scale single batch biomass to liquid fuel facility". Thesis, University of Fort Hare, 2014. http://hdl.handle.net/10353/811.
Texto completoSternberg, Kyle Matthew. "High power, high efficiency, low cost DC/DC converters for laser test equipment and residential fuel cell applications". Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/sternberg/SternbergK1209.pdf.
Texto completoBenedetto, Michael V. "A possible solution for the U.S. Navy's addiction to petroleum : a business case analysis for transitioning the U. S. Navy from petroleum to synthetic fuel resources /". Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion.exe/07Mar%5FBenedetto.pdf.
Texto completoThesis Advisor(s): Daniel A. Nussbaum. "March 2007." Includes bibliographical references (p. 95-99). Also available in print.
Wang, Ying-Chin. "Using Red Blood Cells in Microbial Fuel Cell Catholyte Solution to Improve Electricity Generation". The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1398945679.
Texto completoBahrami, Milad. "Contribution to the development of a fuel cell management system". Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0025.
Texto completoThe essential challenge in using renewable energy-based electricity generation is the intermittency of resources. Therefore, new ways to store electricity is inevitable. Hydrogen as an energy carrier can deal with this issue. Hydrogen can be produced by using the excess energy of renewable energy sources. Therefore, a Polymer Electrolyte Membrane Fuel Cell (PEMFC) as a device that can directly convert hydrogen energy to electricity is an important part of this solution. The cost and durability are the major challenges to enable the diffusion of this technology in the mass market. In the frame of a multi-vectors microgrid, a Fuel Cell Management System (FCMS) is proposed and designed in this thesis that allows optimizing the reliability and life of PEMFCs through controlling the operating condition of cells to avoid electrochemical instabilities. A proposed diagnostic method along with a new hybrid power electronics architecture is the core of this FCMS. The diagnostic method can detect most of the FCMS instabilities by a new comprehensive real-time model. This model can simulate a cell in its stack environment. A hybrid power electronics architecture is developed for this FCMS that guarantees better aging of the system by separately manipulating the supplied power of cells. The proposed power electronics architecture is hybridized by a Supercapacitor (SC) that can compensate for the low dynamic of PEMFCs in supplying the fast dynamic load profiles. A Fuzzy Logic Control (FLC) method is developed as a part of the FCMS to change the reference power of the cell groups based on the model data. The proposed system and its different parts are validated through the simulation and experimental results
Chen, Yingwen, Liuliu Chen, Peiwen Li, Yuan Xu, Mengjie Fan, Shemin Zhu y Shubao Shen. "Enhanced performance of microbial fuel cells by using MnO2/Halloysite nanotubes to modify carbon cloth anodes". PERGAMON-ELSEVIER SCIENCE LTD, 2016. http://hdl.handle.net/10150/621214.
Texto completoRamirez, Rivera Victor Manuel. "Energy management of lossy multi-port to fuel cell-based systems". Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112087/document.
Texto completoEfficient regulation of the energy transfer between generating, storage and load subsystems is a topic of current practical interest. A new strategy to achieve this objective, together with its corresponding power electronics implementation, was recently proposed in this thesis work. The device is called dynamic energy router (DER) because, in contrast with current practice, the regulation of the direction and rate of change of the power flow is done without relying on steady–state considerations. A key assumption for the correct operation of the DER is that dissipation in the system is negligible. Unfortunately, in the presence of dissipation the original DER ceases to be operational. In this thesis a new DER that takes into account the presence of losses is proposed. Simulation and experimental evidence of the performance improvement with the new DER are presented. As a complement of this work a global convergent estimator of parameters of Polymer Exchange Membrane Fuel Cell (PEMFC) was designing by using the principles or “Immersion and Invariance” recently reported in control theory
Walker, Devin Mason. "Catalytic Tri-reforming of Biomass-Derived Syngas to Produce Desired H2:CO Ratios for Fuel Applications". Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4250.
Texto completoGibrael, Nemir y Hamse Hassan. "HYDROGEN-FIRED GAS TURBINE FOR POWER GENERATION WITH EXHAUST GAS RECIRCULATION : Emission and economic evaluation of pure hydrogen compare to natural gas". Thesis, Mälardalens högskola, Framtidens energi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-42306.
Texto completoBARUA, SUKHENDU LAL. "APPLICATION OF CONDITIONAL SIMULATION MODEL TO RUN-OF-MINE COAL SAMPLING FREQUENCY DETERMINATION AND COAL QUALITY CONTROL AT THE POWER PLANT (BLENDING, GOAL PROGRAMMING, MICROCOMPUTER)". Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/187940.
Texto completoAnosike, Nnamdi Benedict. "Technoeconomic evaluation of flared natural gas reduction and energy recovery using gas-to-wire scheme". Thesis, Cranfield University, 2013. http://dspace.lib.cranfield.ac.uk/handle/1826/8625.
Texto completoKong, Suyao. "Advanced passivity-based control for hybrid power systems : application to hybrid electric vehicles and microgrids". Thesis, Bourgogne Franche-Comté, 2020. http://indexation.univ-fcomte.fr/nuxeo/site/esupversions/a01b06c5-fb6c-452d-bd16-02b269cd0bb9.
Texto completoA Fuel cell (FC) hybrid power system is a promising solution to deal with the atmospheric pollution and fossil fuels shortage problems. This thesis focuses on the controller design for FC hybrid power systems, towards two applications: the hybrid electrical vehicle and the microgrid-powered datacenter.Firstly, this thesis proposes an advanced passivity-based control for a FC/super-capacitors (SCs) hybrid system. In order to solve the converters coordination problem, a controller designed using the design method Interconnection and Damping Assignment - Passivity-Based Control (IDA-PBC) is applied, which considers the state-of-charge of the SCs as well as voltage and current limitations. The proposed controller is validated on a Power Hardware-in-the-loop (PHIL) platform. Then an Extended Kalman Filter (EKF) is applied to forecast the State-of-Health (SoH) of the fuel cell and is combined with the proposed controller. Finally, a Hardware-in-the-loop (HIL) platform based on an INTEL/ALTERA FPGA is designed in order to validate the real-time operation of the algorithms for a specific case study with a commercial vehicle.For microgrid applications, a passivity-based controller for a hybrid power supply system for a green datacenter is proposed, including photovoltaic panels, a fuel cell, SCs and an electrolyzer. The feasibility of this non-linear controller is proven by the simulation results and experimental validation on a PHIL test bench. This work is integrated into the ANR DATAZERO project.The main novelty of the proposed controller is that it integrates some component constraints directly into the controller equations, while the locally asymptotic stability of the whole closed-loop system is preserved
Pietrelli, Andrea. "Electrical valorization of MFC : application to monitoring". Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEC001/document.
Texto completoIn recent years, the extensive use of fossil fuels has triggered into a global crisis due to high pollution and stock reduction, because of its nature of non-renewable source of energy. Because the wide use of fossil fuels has led to the production of high amounts of CO2, as a result is a trigger of the global warming issue. Microbial fuel cells (MFCs) is an energy harvesting technique that converts chemical energy from organic compounds to electrical energy through catalytic actions of microorganisms. MFC can be considered as archetypical microbial Bioelectrochemical Systems (BESs), that exploit the bio-electrocatalytic activity of living microorganisms for the generation of electric current. In the past decade, the evolution of low power electronics has made MFCs technology more attractive, because it has begun to be able to power low-power devices forming complete systems, such as the nodes of a wireless sensor network (WSN). Moreover, MFCs gained more interest because they can generate electric power while treating wastes. Unlike other fuel cells, MFCs can continuously generate clean energy at normal temperature, atmospheric pressure, and neutral pH value without any supplementary maintenance. The only by-products are CO2 and H2O, which do not require additional handling. The production of CO2 is part of a short duration carbon cycle. The CO2 produced is biogenic, which is included in the biogeochemical carbon cycle, avoiding net carbon emission into atmosphere. This manuscript examines many aspects related to microbial fuel cell technology from chemical reactions inside the cells to the energy management systems required to exploit energy delivered from MFCs for practical usage in autonomous sensors. Experimental campaign was performed on MFCs regarding electrical characterization, multiple connections of MFCs and influence of main parameters that affect energy conversion performances. The experimental tests were performed on two different lab-scale reactor typologies: terrestrial microbial fuel cell and waste water microbial fuel cell. A survey is presented about different proposed energy management systems and other devices able to build a node of a WSN powered by MFCs
Franco, Alejandro A. "A multiscale modeling framework for the transient analysis of PEM Fuel Cells - From the fundamentals to the engineering practice". Habilitation à diriger des recherches, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00740967.
Texto completoDaun, Kevin. "Impact of energy storage technologies in a distribution grid : An analysis of Key Performance Indicators relating to a local grid’s performance characteristics". Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-55367.
Texto completoBrundin, Carl. "Alternative energy concepts for Swedish wastewater treatment plants to meet demands of a sustainable society". Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-146831.
Texto completoRathore, Akshay Kumar. "High-frequency transformer isolated power conditioning system for fuel cells to utility interface". Thesis, 2008. http://hdl.handle.net/1828/2871.
Texto completoYu, Ching-Chou y 余景州. "Application of Digital Signal Processor Based Multi-Leg DC-DC Power Converter to Fuel-Cell Power Supply System". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/q6aw5b.
Texto completo國立臺灣科技大學
電機工程系
94
This thesis focuses on the design and implementation of a digital signal processor based multi-leg dc-dc power converter for fuel-cell power supply systems. A multi-leg boost converter is designed in this system to reduce the output current ripple and increase the life time of fuel-cell. According to input and output voltage feedback and current feedback controls, the multi-leg power converter can not only balance the current of each leg, but also provide a steady output voltage to load. Besides, a bi-directional dc-dc power converter is used in this system to charge or discharge the batteries and balance the system power. The redundant power of fuel-cell can be stored in batteries by the power control between fuel-cell and batteries. Battery discharge will occur momentarily to meet the instant need of high system current and thereby raise the response speed when load changes. Fuel-cell can thus be operated in the average power point which fit in with the load. In this thesis, the mathematical models and controller of multi-leg dc-dc power converter are built and used for digital control. Then, a high-performance, low-cost digital signal processor (DSP, TMS320F2812) is used as the control core. The control of power converter and the method of power balance control are accomplished by software so as to reduce the cost. A prototype of 1kW multi-leg dc-dc power converter for fuel-cell is developed. The input voltage range is between 26V and 40V. The output voltage is 40V. Moreover, the experimental data show that the efficiency of the system reaches 93%, and the input current ripple of fuel-cell is less than 5%. Simulation and experimental results are given to justify the analysis.
KE, TING-RU y 柯廷儒. "Application of Graphite Film to Development of Fuel Cell Collector Plate and Power Installation". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/h58dvd.
Texto completo國立勤益科技大學
冷凍空調與能源系
107
This study developed a lightweight collector plate for long-term stable output, which is fixed into the fuel cell module and combined with circuit design to develop a power installation. The FR-4 Glass/Epoxy was used as substrate of collector plate, and the substrate was coated with a layer of copper as conductive layer by using thermal evaporation process. The copper plated conductive layer was covered with graphene suspension, graphene dispersion, graphene ink and graphene target material as corrosion-resistant layer. The sheet resistance and Tafel electrochemical tests were performed for the collector plate, and then 2cell fuel cell module was assembled for AC impedance spectrum measurement, performance test and stability test. The test results showed that the graphene dispersion can deliver 1.2W in the open 2cell fuel cell module. It has the best performance among the four materials. Afterwards, the fuel cell module is assembled and bonded by using this material and hot pressing technique in the concept of PCB, and the fuel cell module is partially cooled by water chiller and fixture to prevent the MEA from being damaged by high temperature in the course of hot pressing. Finally, it is combined with circuit and small hydrogen storage tank to form a power installation. The maximum power output is 1.4W, the power is successfully supplied to LED lamp, fan and mobile phone.
Tsai, Hsin-ting y 蔡欣庭. "Review of the Impacts on Power Quality and System Stability to Power Systems by New Energy Systems :Wind Power﹐Photovoltaic and Fuel Cell". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/01099639640694189342.
Texto completo國立中正大學
電機工程所
97
Energy demands from human beings are increasing. Electricity usage is also rising from year to year. Nowadays, most electricity comes from the conversion of fossil and hydro energies. Fossil energy storage is limited on earth and using fossil energies would produce green house effect. Sustainable energy conversion technologies are developing around the globe to replace the dependence on fossil-based generation. New electricity generation technologies, e.g. wind turbine, photovoltaic, fuel cell and etc., are penetrating in the power system network in a great increasing rate. In this thesis, based on published works, we discuss on the power quality problems that may be induced by the integration of these new energy generation systems into power systems. Several mitigation methods to the power quality problems are listed and their operations are discussed. In addition, when new energy generations are integrated into power systems, the impacts of transient stability when fault occurs, or switch-in or switch-off these new energy sources are analyzed. Counter-control methods are also discussed.
Huang, Yu-Jr y 黃昱智. "Application of Sliding-Mode Controller to the DC Power Converter of Fuel Cell Generation Systems". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/uhefb5.
Texto completo國立臺灣科技大學
電機工程系
95
The purpose of the thesis is to present a method of producing a DC/DC power converter of fuel cell generation systems, with boosting fuel cells low DC voltage to high DC output voltage. The systems must have the capacity of power compensating. Thus, we use a battery bank as an adjusting use of the fuel cell generation systems. Once the loading varies, the systems must have the capacity of robust responses. The systems use a full-bridge DC/DC converter for the fuel cells, and boost/buck DC chopper as the converter of the battery’s charging and discharging. In the thesis, we use a sliding-mode controller as the voltage controller of the DC bus, and the digital signal processor (DSP TMS320F2812) as the control unit, which controlling strategy is accomplished by the C programming. The result shows that, when the full-bridge power converter is joined with boost/buck DC chopper in parallel, it can serve a DC voltage of over 340V and a power of 800W, meanwhile, as output voltage of the fuel cells changes due to loadings, the sliding-mode controller can cause more rapid responses and robustness to the DC bus voltage source.
Iglesia, Jericha Cher Rodriguez y 林雨潔. "Tailoring the Structure and Properties of Cathode to Achieve High-Power Density PEM Fuel Cell". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/c4wdyp.
Texto completo國立中央大學
能源工程研究所
107
Recently, fuel cell technologies have received much attention as an alternative energy source. Fuel cells are like batteries that convert chemical energy into electricity. Different specifications and system design of the fuel cells are required for different applications. Among all the fuel cells, PEM fuel cell produces the most power for a given volume of the fuel cell, which makes them suitable for vehicles. In this study, pulsed laser deposition (PLD) in Ar atmosphere was used to deposit Pt nanoparticles on the gas diffusion layers (GDLs). There were two methods of tailoring the GLDs have been explored in this study. The first method is to improve the proton transport by drop casting Nafion on the GDL. The second topic is centered on increasing the surface area of the catalyst by laser micro-machining the GDL. On the first method, the influence of Nafion® ionomer content drop casted on the GDL was investigated. The addition of Nafion® ionomer content in the catalyst ink enhances the proton conduction. In our study, Nafion® ionomer content is separately deposited on the GDL. The Pt was first deposited on the GDL and afterwards drop casted by Nafion® solution. Different Nafion® concentrations were diluted in different concentrations of water and ethanol. Results showed that the wettability of the substrate and the solution play a great role in achieving the highest current density. At lower Pt loading, 100 μg cm2, the optimized Nafion®, water, and ethanol concentration were 0.05 wt%, 33.5%, and 66.5%, respectively. On the other hand, at higher Pt loading, 200 μg cm2, the optimized Nafion® concentration was 0.025 wt%. Further characterizations are needed to quantify the drop casting method. The second method include laser micro-machining the substrate. Laser-micromachining the substrate demonstrate that by increasing the Pt loading the power density does not drop. Increasing the Pt loading increases the film thickness which affects the fuel cell performance. Firstly, the picosecond laser fabricates grooves on the surface of the gas diffusion layer to greatly increase the effective surface area of Pt deposition, thereby re- ducing the Pt film thickness. And, secondly, pulsed laser deposition was used to deposit the Pt on to the catalyst. A 2-fold increase in the maximum power density is achieved by using laser micro-machined periodic grooves of 40 μm period, 20 μm groove width, and 10 μm depth, reach 853 mW/cm2 and a maxmimum power density of 1.2 mW/cm−2 with a cathode Pt loading of 200 μg/cm2 . Further promotion is expected if the groove width and the period could be reduced by improving the laser micro-machining process.
Gaweł, Duncan Albert Wojciech. "The Development of a Coupled Physics and Kinetics Model to Computationally Predict the Powder to Power Performance of Solid Oxide Fuel Cell Anode Microstructures". Thesis, 2013. http://hdl.handle.net/1974/8399.
Texto completoThesis (Master, Mechanical and Materials Engineering) -- Queen's University, 2013-10-01 09:41:47.617
Huang, Chien-Yao y 黃健曜. "Fabrication of Highly Hydrophilic Catalyst Anode by Electrophoretic Deposition to Extend Power Efficiency of PEM Fuel Cells at Low Humidity Conditions". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/71855280866794209684.
Texto completo逢甲大學
綠色能源科技碩士學位學程
101
The aim of this study is to fabricate membrane electrode assembly (MEA) by using novel hydrophilic catalysts including platinum nanocatalysts with silica nanospheres (Pt/C-SiO2), platinum nanocatalysts with hollow silica nanospheres (Pt/C-hSiO2), pyrolytically synthesized platinum particles mixed with activated carbon and hollow silica nanospheres (Pt/C/hSiO2). The modified catalyst layer with enhanced hydrophilicity was prepared by electrophoresis deposition (EPD) method. Effect of hydrophilic material in the catalyst layer on improvement of proton exchange membrane fuel cell (PEMFC) operating life under low humidity conditions was investigated. The Pt/C nanocatalysts were also deposited on carbon paper (SGL-10BC) to be gas diffusion electrodes (GDE) of PEMFC by EPD process. A uniform Pt/C layer, which was obtained under EPD’s electrical field of 280 V/cm, was of 420 mA/cm2 current density under I-V test at 0.6 V. The hydrophilic GDE (Pt/C-SiO2, Pt/C-hSiO2) under the I-V test showed the optimal content for SiO2 and hSiO2 for the best performance were 33wt% and 16wt%, respectively., Such hydrophilic GDE does improve MEA’s humidification ability and cell operating stability, which showed its cell voltage decade at 4.52~6.77% through 560 hr continuous operation at the low-humidity conditions, as compared cell voltage decade of normal GDE more than 15.5%. For hydrophilic multilayered Pt/C/hSiO2 composite, where the Pt/C catalyst (size of Pt particles range from 8.17 to 10.02 nm) were produced from one-step and two-step thermally reduced processes, had current density of 42 mA/cm2 from I-V test. When silica templates in Pt/C/hSiO2 composite were removed by HF solution, the triple phase boundaries (TPB) of MEA was boosted and the current density was substantially increased (63 mA/cm2 in ohmic polarization region and 238 mA/cm2 in concentration polarization region) due to the enhanced transfer efficiency of the fuel gases as well as conduction velocity of water molecules.