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Preparation and characterization of unsaturated bio-polyester resins
Žůrek, Michal ; Petrůj, Jaroslav (referee) ; Figalla, Silvestr (advisor)
The theoretical part of this work is devoted to the selection of suitable components for synthesis of a branched oligoester and their structural arrangement. Further, oligomers of lactic acid esterified with crotonic acid branched by erythritol or pentaerythritol are discussed. Crosslinking of prepared oligoesters is accomplished by free radical mechanism using vinyl acetate as reactive diluent and 2,2'-azo-bis-isobutyronitrile as initiator. Resin was cured by vinyl acetate in different mass ratios. Results show that there in an optimal ratio for curing between oligoester and reactive diluent. Using less vinyl acetate results in insufficient crosslink density or, on the contrary, using considerable excess of vinyl acetate causes rapid polymerization, that also results in lower density of crosslinking. The crosslink density was determined indirectly by extraction of the soluble part to acetone after curing and drying of the product.
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Critical Analysis of EU Policy and Its Impact on Business of E.ON SE
Starostová, Andrea ; Kamenický, Oldřich (referee) ; Škapa, Stanislav (advisor)
Hlavným cieľom diplomovej práce je kriticky analyzovať politiku Európskej Únie a jej dopad na činnosť nadnárodnej spoločnosti E.ON. Keďže politika Európskej Únie má za cieľ zefektívniť spôsob podnikania vykonávaného v rámci Európskej Únie a okrem iného má predstavovať garanciu zodpovednosti jak spotrebiteľov, tak dodávateľov operujúcich na trhu, tak zámer práce bol definovaný na analýzu politického vplyvu rozhodnutí Európskej Únie a ich dopad na následné strategické rozhodnutia firmy. Analytická čas práce je preto zameraná na analýzu Európskej energetickej politiky s kladením dôrazu na profil spoločnosti E.ON, Európsku energetickú stratégiu, obnoviteľné zdroje, jadrovú energetiku, bezpečnosť energetickej dodávky a na Európsky systém obchodovania s emisiami.
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Renewable energy sources in CR
Kozumplík, Ondřej ; Škvařil, Jan (referee) ; Fiedler, Jan (advisor)
The content of bachelor study is the technical recherche of the renewable resources of energy in the Czech republic. It appears here the principal, use, potential and advantages and disadvantages of each type of renewable resources - water, wind and biomass. Then the use of solar energy for photovoltaic conversion to electrical energy is described in detail. At the end of this study is described one of the many recently build photovoltaic power stations in the South Moravia territory, the solar power station in Bzenec.
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Technology Power to X
Řezník, Dominik ; Baláš, Marek (referee) ; Kracík, Petr (advisor)
The bachelor thesis deals with technologies for the electricity storage based on its conversion into another form of energy ("Power to X"). It considers the possibility of their use for the storage of electricity generated by renewable energy sources, which should gradually replace conventional electricity production in coal-fired power plants. The first chapter of the thesis is devoted to the current and possible future state of the electricity sector in the Czech Republic and a description of selected electricity generation technologies. The second chapter contains a classification and description of technologies suitable for electricity storage – their functional principles, advantages and disadvantages or e.g. possibilities of further use of products obtained by means of conversions are included. In the third chapter, selected parameters of these technologies are illustratively compared in created graphs, each containing two parameters. The results of the comparison are then continuously discussed.
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Inovation of a photovoltaic power system with battery storage
Pallová, Ivana ; Jandová, Kristýna (referee) ; Vaněk, Jiří (advisor)
This diploma thesis is focused on the Innovation of the existing power plant with battery storage. In the theoretical part, the individual parts of the photovoltaic power plant are introduced, the principle of operation of the photovoltaic cell and the individual types of these cells are desribed. The work also deals with the description of the existing photovoltaic power plant and their components. Subsequently, a battery systém and otherpossibilities of Innovation with the possibility of a subsidy and without it are designed. In the final part, the most advantageous solution is evaluated according to the performes simulations.
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Analysis of the influence of thermal effects on thermophotovoltaic system
Kolář, Jakub ; Vyroubal, Petr (referee) ; Šimonová, Lucie (advisor)
This semestral thesis focuses on the description of specific renewable resources in the form of thermophotovoltaic cells using selective radiators with micro/nano structures. This work deals with an introduction of renewable resources and specifically focuses on thermophotovoltaic. Thesis describes basic principles, but also influences affecting the proper functioning of these systems. It also focuses on selective radiators, which are created by mikro/nano structures, and factors that can affect their implementation or simulation. Part of the work are also examples of calculations of basic parameters of the structures, which will be used in the simulations. Next chapters are dealing with simulations which are analyzing thermal effects on termophotovoltaic system. Except the analysis itself there is also partial optimalization solving some of the negative thermal effects.
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Photovoltaic power systems for stand-alone applications
Hrňa, Lukáš ; Fišer, Jan (referee) ; Hejčík, Jiří (advisor)
Topic of Bachelor’s thesis is descriptions photovoltaic power systems and their parts. It describes photovoltaic power system for stand-alone applications. In Bachelor’s thesis make photovoltaic power system for cottage. It characterizes basic components for build-up, basic aspect for determination right component and talk about immunity photovoltaic power system in long time.
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Small scale photovoltaic system
Vaľočík, Jan ; Škvařil, Jan (referee) ; Pospíšil, Jiří (advisor)
The aim of this work is utilization of solar energy for electrical energy production focusing on photovoltaics. First, the principle, function and structure of photovoltaic cells is described. Then the current types of cells are introduced, followed by possibilities on how to increase the production of electrical energy from photovoltaic modules. Subsequently the connection methods between the photovoltaic systems and the network are discussed. The thesis is concluded by a design of a small scale photovoltaic system for a family house including an economic evaluation.
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Heat Pump Supplied from Photovoltaic System
Kaděra, Jan ; Pěcha, Jiří (referee) ; Mastný, Petr (advisor)
This thesis provides heat pump usage in heating mode, heating of potable water or cooling mode. The heat pump is connected with photovoltaic power plant. The main aim of this study is to create photovoltaic system connected with heat pump and present the results of an energetic and economic evaluation. The theoretical part describes principle function heat pumps, photovoltaic power plants and components. The study provides as well a description of heating systems with a heat pump used for space heating or cooling. In the practical part of this thesis was performed calculation of energy consumption in a building. Based on this data, has been selected a suitable heat pump. To reduce the energy consumption was designed a hybrid photovoltaic power plant with a battery accumulation. Utilization of electric energy from photovoltaic system was calculated. Solutions provide the option of the energy flow analysis in specific interval. Results are summarized in the energetic and economic evaluation. The proposed solution can be applied for reconstruction or construction of a new building, focused on usage of renewable resources and emissions reduction.
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Reactive power changes at the TSO-DSO interconnection point by RES power factor regulation
Pololáník, Pavel ; Fiala, Zbyněk (referee) ; Ptáček, Michal (advisor)
This bachelor thesis deals with the long-term development of active, and primarily reactive energy flow at 110/22 kV distribution transformation points in the E. ON distribution network. It compares two different areas (city vs. countryside), differing in type of used distribution network and in composition of decentralized energy resources. Another point of this thesis is to describe current controlling possibilities for decentralized resources installed to the voltage level of 22 kV considering reactive power compensation. Thesis introduces proposed methods and conditions used in remote mass controlling of power factor of decentralized resources. There is mentioned an evaluation of an already performed test whose purpose was to verify possibility of influencing reactive power at the interconnection point between distribution and transmission system. The factors causing the overflow reactive power were analysed. In this thesis were analysed factors, which causing overflow reactive power from distribution to the transmission system. This analysis will be the basis for future use of mass reactive power regulation.
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