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Hydrogen as a promising energy carrier
Pinkas, Marek ; Brázdil, Marian (referee) ; Pospíšil, Jiří (advisor)
In recent years hydrogen has become an integral part of modern energetics. Although there are still many unresolved barriers and technological shortcomings in hydrogen energetics, its importance is expected to grow even more in the coming years. These facts were the motivation for writing this thesis. This bachelor thesis deals with hydrogen as a medium for energy storage and transmission as well as research about its properties, storage, production and use. In this thesis are described and compared various methods of long-term energy storage that are currently used. Presented are various traceable hydrogen pilot projects.
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Integrating renewable energy sources into the power system
Kadlec, Tomáš ; Štelcl, Otakar (referee) ; Moskalík, Jiří (advisor)
The bachelor’s thesis shows challenges with using renewable sources of energy and their integration into the power system. It provides an overview of renewable energy sources and how they affect the functions of power system. It also includes a description of power system and unstable energy production of renewable sources. Thesis shows possible solutions of this instability, especially by using energy storage and some developments in power systems.
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Hydrogen fuels
Tyagunova, Victoria ; Bébar, Ladislav (referee) ; Jícha, Jaroslav (advisor)
This thesis presents a basic review of production and use of hydrogen fuels. The main focus of this paper is the use of hydrogen in industry and power engineering. The first part concerns various industrial production technologies. The next section is dedicated to the description of hydrogen use for energy conservation, fuel cells, power plants and combustion engines. it includes the comparison of hydrogen and classic fuels. The final part focuses on the economy and costs of hydrogen production and use. This paper will evaluate hydrogen as a potencial fuel for future and will estimate it’s advantages and disadvantages in comparison with conventional fuels.
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Power to gas
Abdallah, Hadi ; Lázničková, Ilona (referee) ; Radil, Lukáš (advisor)
Tato práce se zabývá problematikou technologie power-to-gas, která slouží k akumulaci energie tím, že přeměňuje přebytečnou elektrickou energii vyráběnou z obnovitelných zdrojů energie na syntetický zemní plyn. Cílem bylo představit aktuální trendy v oblasti power-to-gas a vytvořit model tohoto systému v OpenModelica. V práci jsou uvedeny všechny hlavní části systému power-to-gas: výroba elektrické energie, výroba vodíku elektrolýzou, zachycování a separace uhlíku, Sabatierova reakce a typy metanizace. Nejprve byl modelován denní průběh slunečního záření. Poté byl zpracován submodel přeměny záření na elektrickou energii pomocí FV panelů. Dále byl zpracován střídač DC/AC, distribuční cesta a měnič AC/DC pro napájení elektrolyzérů. Stěžejní částí práce bylo zpracování vlastní metanizační jednotky. Reakce je řešena pomocí van der Waalsovy rovnice reálných plynů. Podle toho je stanovena produkce metanu, který je poté skladován v nádržích. Dále se provádí simulace se dvěma cestami. Za prvé, energie získaná z fotovoltaické elektrárny je přímo vedena přes distribuční soustavu k elektrolyzérům. Za druhé, energie získaná z fotovoltaické elektrárny je přiváděna do 22 kV distribuční sítě, která pak napájí zbytek procesu. Závěrem práce je zhodnocení, které porovnává celkovou efektivitu systému vzhledem k power-to-gas vůči akumulátorovému úložišti energie.
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Hydrogen and automobiles
Břoušek, Lukáš ; Kloss, Ondřej (referee) ; Kaplan, Zdeněk (advisor)
The purpose of this thesis is to demonstrate the possibilities of hydrogen-based gear in personal cars. The thesis also describes the hydrogen from the perspective of the characteristics, the form of production, conserving, distributing and its utilization. Furthermore, in more details are described and compared currently well-known hydrogen-based devices, for this purpose the complex analysis Well to Wheel will be used. Final part of this publication will be devoted to evaluation of this analysis and also the thesis will outline what are the probable trends of the hydrogen-based technologies.
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Negative Electrode for Sodium-ion batteries
Šimek, Antonín ; Bača, Petr (referee) ; Libich, Jiří (advisor)
This master’s thesis is focused on the research of negative electrode materials for sodium-ion batteries. It contains a general introduction to the issue of batteries, their brief historical development, basic operating principles, key parameters and classification. Attention is paid to lithium-ion batteries, which are the most used technology today. Sodium-ion batteries as their potential replacement, especially in the field of energy storage from renewable sources, are based on lithium-ion technology. Promising candidates for the material for the negative electrode of sodium-ion batteries are sodium titanates. Their synthesis and subsequent electrochemical characterization of electrodes using sodium titanate as the active material are included in the practical part of this work.
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Possibilities of energy storage
Sedlák, Petr ; Hrnčířová, Michaela (referee) ; Moskalík, Jiří (advisor)
Because part of energy produced from renewable sources is growing continuously, increasing the gap between consumption and production of electricity. This has a negative impact on the electricity grid, therefore hence the need to accumulate energy. In the following work is mapped out different ways of accumulation of electrical energy. There is described their used, advantages and disadvantages of different storage systems
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Mechanical Design of Flywheel Energy Storage System
Hanáček, Jiří ; Šebesta, Karel (referee) ; Hartl, Martin (advisor)
This bachelor thesis focus on flywheel energy storage construction. The aim of the work is to discuss nowadays construction types of each component of these batteries. Single chapters are focused on rotor, bearings, motor generator and enclosure of the system. There is shown a basic principle of each component and itsfunction within the battery system, used materials and shapes and other factors influencing the construction. This thesis is also focused on stress analysis of metal and composite rotor, rotor fit with help of magnetic bearings, power transfer with help of motor generator and on the enclosure design of that mechanical battery.
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