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 40 for “"Fuel cell systems"”.
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Thermodynamic analysis of molten carbonate fuel cell systems
… the thermodynamic analysis of a molten carbonate fuel cell (MCFC) hybrid system to determine its efficiencies, irreversibilities and performance.The analysis includes a performance investigation of a typical molten carbonate fuel cell stack, an industrial MCFC hybrid system, and an MCFC hybrid …
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Feasibility of fuel cell systems for building applications
… will be produced by Distributed Generation (DG) systems. DG refers to power generating technologies independent from the electrical grid, located at or near the location where electricity is consumed. Fuel Cells have become very attractive DG systems in recent years, however, Fuel Cells are still …
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Analysis of Fuel Cell Systems for Off-Road Agricultural Vehicles
L'abstract è presente nell'allegato / the abstract is in the attachment
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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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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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INTELLIGENT FAULT DETECTION AND ISOLATION FOR PROTON EXCHANGE MEMBRANE FUEL CELL SYSTEMS
… is used to model the proton exchange membrane fuel cell nonlinear systems using a multi-input multi-output structure. This research proposed the use of radial basis function network and multilayer perceptron network to perform fault detection. After training, the neural network models can give …
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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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Novel Polyphenylquinoxaline and Polybenzimidazole Proton Exchange Membranes For High Temperature Fuel Cell Systems
<p>Proton exchange membrane fuel cells (PEMFCs) have recently been acknowledged as one of the most promising alternative power sources due to their clean and efficient operation, as well as their numerous applications in transportation, stationary, cogeneration, and portable systems. High …
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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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Control of balance of plant components for solid oxide fuel cell systems with sensitivity to carbon formation
Solid oxide fuel cell systems have the potential to provide efficient, low greenhouse gas emitting power without the availability problems of both wind and solar energy. SOFC systems operate at high temperatures (600 C) in order to reduce ionic transport losses through a ceramic electrolyte. The …
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Proton Exchange Membrane Fuel Cell Systems Based on Aromatic Hydrocarbon and Partially Fluorinated Disulfonated Poly(Arylene Ether) Copolymers
… progress in proton exchange membranes (PEM) for fuel cells. In particular the synthesis and characterization of materials for advanced alternative PEM were studied with an emphasis on structure-property and structure-property-performance relationships. The focus has included firstly a one-step …
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Renewable Electricity Generation via Solar-Powered Methanol Reforming: Hybrid Proton Exchange Membrane Fuel Cell Systems Based on Novel Non-Concentrating, Intermediate-Temperature Solar Collectors
… conversion of solar energy. Solar thermal power systems offer a compelling opportunity for renewable energy utilization with high efficiencies and excellent cost-effectiveness. The goal of this work was to design a non-concentrating collector capable of reaching temperatures above 250 °C, use …
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Synthesis and Chacterization of Novel Polybenzimidazoles and High-Solids Meta-Polybenzimidazoles
<p>Polymer electrolyte membrane (PEM) fuel cells are one of the most promising alternative power devices available due to their multiple applications as well as their clean and efficient operation. PEM fuel cells that operate at high temperatures (> 120oC) have advantages over low temperature PEM …
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Man-portable power generation devices : product design and supporting algorithms
… optimal design and operation of microfabricated fuel cell systems is proposed and algorithms for relevant optimization problems are developed. The methodology relies on modeling, simulation and optimization at three levels of modeling detail. The first class of optimization problems considered …
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Analysis and optimization of fuel cell based integrated powering systems for clean rail applications
In this thesis, proposals of novel integrated fuel cell powering systems for cleaner railway applications are presented and analyzed thermodynamically. Both energy and exergy analyses are conducted on these systems for such an application to evaluate and compare them thermodynamically, in terms of …
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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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Broadband excitation of fuel cells for online condition monitoring using different switch-mode DC-DC mode topologies
… and climate in the area. This, in essence, makes fuel cell systems desirable as a renewable energy source and storage in the form of green gases obtained from electrolysis or other processes using these intermittent green energy sources. Online condition monitoring of fuel cell systems without the …
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First principles study of effect of surface structure on chemical activity of Pt electrocatalysts in fuel cells
To facilitate commercialization of fuel cell systems as alternative energy device, the enhancement of Pt electrocatalysts activity is one of the most challenging issues. The first step to the solution is elucidating relationship between surface structure and chemical reactivity as electrocatalysis …
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High-temperature microfluidic systems for thermally-efficient fuel processing
Miniaturized fuel cell systems have the potential to outperform batteries in powering a variety of portable electronics. The key to this technology is the ability to efficiently process an easily-stored, energy-dense fuel. In many cases, use of these fuels requires a fuel processor-a high …
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Use of fuel cells for improving on-site emergency power availability and reliability ad nuclear power plants
… significantly. This study evaluates how suitable fuel cell systems are today for improving back-up power performance on nuclear power plant sites and how suitable they can be projected to be by year 2030, when Generation IV reactors are planned to be deployed. The main system under consideration …
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