Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 34 for “"fuel cell system"”.
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Distributed Generation Reformer and Fuel Cell System Modeling and Reformer Catalyst Layer Optimization
… a diesel-fed steam reformer and solid oxide fuel cell stack system Honeywell UniSim® Design Suites model and a two-dimensional diesel-fed steam reformer ANSYS Fluent model. The performance of the reformer and fuel cell system was compared to the performance of diesel generators in Canadian …
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Modeling, Analysis and Design of a Regenerative Direct Sodium Borohydride Fuel Cell System
Made available in DSpace on 2017-07-06T18:49:05Z (GMT). No. of bitstreams: 3 Kopec_Grant_M_MS.pdf: 1152173 bytes, checksum: 5f5bc6bf0622231f46fd2c771854a96a (MD5) Kopec_Grant_M_MS_ABS.pdf: 7761 bytes, checksum: f26337585d3b36b9395648a055f107c8 (MD5) license.txt: 4813 bytes, checksum: …
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Dynamic Proton Exchange Membrane Fuel Cell System Synthesis/Design and Operation/Control Optimization under Uncertainty
Proton exchange membrane fuel cells (PEMFCs) are one of the leading candidates in alternative energy conversion devices for transportation, stationary, and portable power generation applications. PEMFC systems with their own fuel conversion unit typically consist of several subsystems: a fuel …
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Modelling and optimisation of the dynamic performance of a reversible solid oxide fuel cell system for the grid intergration of renewables
… is to use high efficiency reversible solid oxide fuel cell (RSOFC) system as an energy storage device. A development of solid oxide fuel cell is being carried out at University of St. Andrews with focusses mainly on material selection and coating technology, etc. This RSOFC system aims to provide …
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Creazione e sviluppo di un sistema di controllo in tempo reale per un sistema fuel cell
The control of a proton exchange membrane fuel cell system (PEM FC) for domestic heat and power supply requires extensive control measures to handle the complicated process. Highly dynamic and non linear behavior, increase drastically the difficulties to find the optimal design and control …
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Model of the Air System Transients in a Fuel Cell Vehicle
… procedure to measure the transient effects in a fuel cell air delivery system. These methods were applied to model the 20 kW automotive fuel cell system that was used in Animul H2, a fuel cell-battery hybrid sedan developed by a group of engineering students at Virginia Tech. The air delivery …
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System Level Modeling of Thermal Transients in PEMFC Systems
Fuel cell system models are key tools for automotive fuel cell system engineers to properly size components to meet design parameters without compromising efficiency by over-sizing parasitic components. A transient fuel cell system level model is being developed that includes a simplified transient …
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Modified Control for Single-Phase Fuel Cell Systems with Input Ripple Compensation and Improved Output Quality
Fuel cells serve as a clean, renewable and efficient source of electrical energy. The power conditioning system associated with their applications consist of a DC-DC converter stage and a DC-AC inverter stage. In a single-phase fuel cell system, the single-phase inverter introduces a second …
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Development and Analysis of a Multifunctional Fuel Cell Structure
Multifunctional material systems are systems that contain individual materials or components which are capable of performing multiple functions. The combination of functions into single entities allows for system-level benefits that are not possible through the optimization of subsystems …
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Holistic Analysis of Fuel Cells for Residential Application
… energy. The index is used to compare the fuel cell system and the traditional grid system powered by coal fired power plants, for a typical residential unit located in the rural Appalachian region in Ohio.
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A Comparison of Two Air Compressors for PEM Fuel Cell Systems
Proton exchange membrane (PEM) fuel cells are considered one of the best potential alternative power sources for automobiles. For this application, high efficiency and high power density are required. Pressurizing the fuel cell system can give higher efficiency, higher power density and better …
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Cold-start effects on performance and efficiency for vehicle fuel cell systems
… academia and industry have been pursuing fuel cell technology as an alternative to current power generating technologies. The automotive industry has targeted fuel cell technology as a potential alternative to internal combustion engines. The goal of this research is to understand and …
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Systems Integration, Modeling, and Validation of a Fuel Cell Hybrid Electric Vehicle
… construction, modeling, and validation of a fuel cell hybrid electric vehicle based a conversion of a five-passenger production sedan. Over 60 engineering students working together as the Hybrid Electric Vehicle Team of Virginia Tech (HEVT), integrated a proton exchange membrane fuel cell …
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Feasibility analysis of polymer electrolyte fuel cells for residential cogeneration applications in Australia
… implementation of the PEFC (Polymer Electrolyte Fuel Cell) stacks for Distributed generation in Australia. The disposition of the thesis starts with an introductory background that highlights the need for a distributed energy system where Hydrogen acts as the main energy source. Subsequently a …
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Modelling and Optimization of Scalable Hydrogen Fuel Cell Systems for Aviation
Fuel cell systems provide one possible technological pathway for sustainable aviation propulsion; however, aviation presents unique challenges for these systems. To address these challenges, this thesis presents a modelling, simulation, and optimization tool for the sizing and performance …
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Microreactors for the Production of Hydrogen From Ammonia
… computer if the reactor is coupled to a PEM fuel cell system.
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Development of a lithium hydride powered hydrogen generator for use in long life, low power PEM fuel cell power supplies
This thesis studies a hybrid PEM fuel cell system for use in low power, long life sensor networks. PEM fuel cells offer high efficiency and environmental friendliness but have not been widely adopted due to cost, reliability, and the problem of hydrogen storage. This thesis focuses on the problem …
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Mathematical Simulation of Direct Glucose Fuel Cell
<p>Enzymatic glucose fuel cell and microbial fuel cell are limited by their extremely low power and short durability. Direct Glucose Fuel Cell (DGFC) appears to be a promising alternative power source in low power portable devices and medicinal implants. In this thesis, a one dimensional …
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