National Repository of Grey Literature 40 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Low temperature Fuel Cells
Kazda, Tomáš ; Novák, Vítězslav (referee) ; Barath, Peter (advisor)
The Bachelor’s thesis is aimed at the low-temperature fuel cells and their usage in cars and mobile applications. In the theory part of this project is described the evolution of the fuel cells in last years and historically as well. Further there are described their functions and particular kinds of the fuel cells with aim at low-temperature cells. In the practical part of this thesis we were making different kinds of carbon mixtures. We have been doing measurements of mixtures on rotate disk electrode and in the experimental fuel cell. At the end of the work are experimentally evaluated different types of carbon materials with different contents of platinum depositing. The results are evaluated using electro analytical methods, using this evaluation to optimize the composition of the material used as electrode material in fuel cells.
The hydrogen bus
Kopecký, Petr ; Březina, Michal (referee) ; Štětina, Josef (advisor)
This bachelor's thesis deals with the topic of hydrogen buses, their concept, properties, practical application and economics of operation. It also discusses safety and hydrogen infrastructure, in particular hydrogen production, storage and use, while mentioning future options. Various technical solutions are evaluated with regard to the specifics of buses. It thus offers a general overview of the topic of hydrogen buses and related infrastructure.
Fuel cell with metal hydride hydrogen storage
Bruzl, David ; Libich, Jiří (referee) ; Novák, Vítězslav (advisor)
The bachelor thesis deals with hydrogen fuel cells and hydrogen storage. It describes the history of fuel cell development, the principle of their function and their individual types, with a focus on low-temperature fuel cells, especially the PEMFC type. Hydrogen storage methods are also described, with a focus on metal hydride storage. The design and assembly of the H-200 fuel cell system is described, its basic characteristics are measured and its differences from the manufacturer's characteristics are discussed. The discharge behavior of the HS-760 metal hydride storage system is also included. This behavior is measured by a program that was developed in the Labview environment. The thesis contains a description of this program. The program and the measured data are in the electronic appendices. One chapter of the thesis is also devoted to the operating modes of the whole system.
Possibilities osf hydrogen storage for its utilization in transport
Marek, Jiří ; Čáslavský, Josef (referee) ; Kizlink, Juraj (advisor)
The thesis focuses on a topical issue: formation of new energy system based on hydrogen, also known as Hydrogen economy, with detailed focus on the possibilities of hydrogen storage, as one of the main drawbacks of this concept. The thesis presents four main areas of today's research (metal and chemical hydrides, high-porosity materials and physical storage). Each of the possibilities is presented in relation to the current state of technology, research and development. The author of the thesis attempts to provide an overview of current trends and possible development of each of the materials. All in all, the thesis provides a complete overview of the current state of technology, trends in research and also a broader socio economic context of the researched topic.
Hydrogen production from renewable energy source
Lakva, Petr ; Baláš, Marek (referee) ; Jícha, Jaroslav (advisor)
Hydrogen, as a form of storage for the excess energy from renewable sources, is a technically and economically viable option. However, the technology is not mature enough to compete with the other renewable energy possibilities. In this thesis, a study based on coupling two 330 kW wind-turbines with an NELP. 40 electrolyzer this connection should improve the utilization of wind power. In this thesis are two options of energy utilization. The energy produced by the wind-turbine is stored in the form, of hydrogen and is then delivered for consumption at variable power through a fuel cell, second option is use of produced hydrogen as alternative fuel for cars. This study is a general introduction for the wind energy system with hydrogen storage. Future studies should be more complex and detailed in order to understand and model the system with greater accuracy and to increase the possibility for the utilization of wind energy to generate hydrogen. This would enhance wind power competitiveness and sustain the continuously changing world energy demands.
Hydrogen as an alternative fuel for internal combustion engines
Hurník, Jakub ; Kučera, Pavel (referee) ; Píštěk, Václav (advisor)
The object of this bachelor’s thesis is to analyse characteristics of hydrogen and it’s suitability for internal combustion engines used in transportation technologies. The thesis begins with some significant reasons for implementation of alternative fuels, the main part is focused on hydrogen technologies and it finishes with short prediction of the use of hydrogen in the future. The potential of this fuel is analysed from all important points of view, which means its production, storage, ecology and construction of hydrogen powered engines. The thesis also contains summary of current hydrogen technologies, their comparation, and comparation with current conventional engine technologies.
Storage of hydrogen produced by electrolysis in a metal hydride
Hamřík, Lukáš ; Libich, Jiří (referee) ; Novák, Vítězslav (advisor)
In the theoretical part, this thesis focuses on the possibilities of producing hydrogen from renewable and non-renewable sources, mentioning their advantages and disadvantages. The work describes the properties and basic principles of several types of electrolysis technologies. Technological options for hydrogen storage in the gaseous, liquid and solid phases are listed, in particular with a focus on hydrogen storage in metal hydride storage sites. In practical part, the hydrogen system that was the subject of the measurement is described. Block diagrams and a description of the realisation of control and measurement system engagement are provided, and the method of reading and writing data using LabVIEW is described. The resulting measured temperature and pressure dependencies of the metal hydride storage, their comparison with theoretical knowledge, as well as the two possible modes in which the assembled hydrogen system can be operated are described below.
Weaknesses of hydrogen energy
Zeleňák, Rastislav ; Elbl, Patrik (referee) ; Baláš, Marek (advisor)
This Bachelor's thesis focuses on exploring and researching the various technologies available for producing hydrogen and their shortcomings. The production of hydrogen, a clean and renewable energy source, has become increasingly important as the world shifts towards sustainable energy solutions. This thesis examines the various methods of hydrogen production including steam methane reforming, electrolysis and production by biological processes. This bachelor's thesis also deals with different methods of storing hydrogen and transporting it. Next, the negative properties of hydrogen are listed, such as its explosiveness, or the degradation of materials used in hydrogen technologies, i.e. hydrogen embrittlement. The work focuses on its characterization, mechanisms and prevention against it.
Perspective trends in hydrogen production methods
Leitkep, Jan ; Juřena, Tomáš (referee) ; Brummer, Vladimír (advisor)
Bachelor’s thesis is focused on perspective methods of hydrogen production. First chapters are focused on research of hydrogen resources, methods of hydrogen production and spectrum of its worldwide utilization in present. In this part of the bachelor’s thesis percentage representations of hydrogen resources are stated. Methods of hydrogen production from these resources are described and processes utilizing hydrogen are introduced. Subsequently, the properties of hydrogen fuel are summarized. Following chapters are focused on perspective methods of hydrogen production, hydrogen storage, perspectives of its future usage as a fuel, price of hydrogen produced by these methods and environmental impact of these methods.
Hydrogen production and storage
Tunys, Daniel ; Lachman, Jakub (referee) ; Elbl, Patrik (advisor)
The submitted bachelor’s thesis deals with the research od available methods of hydrogen production and storage and a summary of important current or future hydrogen projects. The thesis discusses possible ways of hydrogen production from fossil and renewable sources and puts into perspective the advantages and disadvantages of individual conventional and experimental methods. The described methods are also compared in terms of emissions that arise during the process. Furthermore, the thesis compares different methods of hydrogen storage and transport with regard to the appropriate practical use of each of them and describes the advantages and disadvantages of different hydrogen storing methods. The last part is an extract of important Czech and global hydrogen projects and hydrogen strategies of individual countries.

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