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Mathematical model of test facility for study critical heat flux
Bartůněk, David ; Šnajdárek, Ladislav (referee) ; Suk, Ladislav (advisor)
In the first part, the bachelor thesis is focused on the description of test facility used for studying critical heat flux and for visualizing two-phase flow in the vertical canal. In the next part, there are the basic mathematical methods that are used for solving transient behavior of real devices. The last practical part of the thesis deals with applying of preceding methods to the preheater as part of the experimental loop and creating mathematical model of this device.
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Materials for IV. generation power plants
Hovorka, Martin ; Svoboda, Pavel (referee) ; Šnajdárek, Ladislav (advisor)
The aim of this thesis is to describe material needs of chosen Generation IV nuclear reactors – VHTR, SCWR, and MSR with the emphasis on the VHTR. It describes the main principle and a constructional arrangement of VHTR components with its material demands. SCWR and MSR reactors are described in terms of its material requirements. The middle part of this thesis is dedicated to the available material candidate analysis. Main material properties are discussed and at the end of this part the suitability of chosen materials for a flange joint in VHTR heat exchanger is assessed. The last chapter (the practical part) is focused on an experimental proposal of changeability of older materials by the new ones using the electron beam welding method.
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Emissions of medium pressure steam boilers for gaseous fuel
Zavadil, Jan ; Milčák, Pavel (referee) ; Šnajdárek, Ladislav (advisor)
The aim of this the Bachelor Thesis is a description of a medium steam boiler for gas fuels, fuel's emissions created during the burning process of natural gas and following evaluation of measured pollutants in 5 years of operation. First part of the thesis describes types of steam boilers and most important parts of it. Following a brief comparison of burners for gas and liquid fuels and pollutants created during the burning process of natural gas and their impact on the environment. The last part focuses on measurements of pollutants in real device and a review of produced pollutants created during the long-term operation.
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Conversion of a combustion turbine burning natural gas to a combustion turbine burning hydrogen
Lněničková, Veronika ; Šnajdárek, Ladislav (referee) ; Škorpík, Jiří (advisor)
The diploma thesis deals with issues related to the combustion of hydrogen in gas turbines. In the introductory part, the technology of the gas turbine and its alternative fuels, which appear to be a suitable substitute for natural gas, are presented. The subsequent part of the thesis deals exclusively with hydrogen, its combustion in gas turbines and a description of the current state of production of turbines capable of burning hydrogen. The theoretical description was supplemented by the calculation of a gas turbine burning different volumes of hydrogen in the fuel. The result of the work is a summary description of the issue and an assessment of the influence of hydrogen on the parameters of the gas turbine.
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Hydrogen filling station
Kaše, Jakub ; Šnajdárek, Ladislav (referee) ; Pospíšil, Jiří (advisor)
Presented master’s thesis deals with hydrogen filling stations, their concepts, design, and operation. The importance of hydrogen as an energy carrier, its properties, and the implications of these properties for the selection of materials suitable for hydrogen applications are described. In order to understand the decisions made in the design of the station, the hydrogen life cycle from production through transportation and storage to use is presented. This is followed by an evaluation of the cycle in terms of economics and environmental impact. The review part of the paper concludes with an introduction to fuel cell vehicles, which includes an overview of the selected passenger and commercial vehicles, and a description of hydrogen filling stations. The filling stations are discussed in terms of concepts and components, and an overview and analysis of selected implementations is also included. The computational part of the thesis focuses on the design and technoeconomic analysis of a hydrogen filling station with a daily capacity of approximately 50 kg/day and an hourly capacity of 6 vehicles/hour for the needs of the logistics company Zásilkovna s.r.o. A station variant with hydrogen gas delivery in pressure vessels was chosen. Three possible designs of the station were compared. The hydrogen filling station can be designed for the specified parameters without any problems. However, the analysis of the results showed a very strong dependence of the acquisition and operating costs on the nominal compressor power. Therefore, the design of the hydrogen filling station requires further optimization, which limits the direct applicability of the presented results.
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Design of hydrogen jet engine to 1kN thrust
Mikulenka, Karel ; Šnajdárek, Ladislav (referee) ; Škorpík, Jiří (advisor)
This thesis includes a brief history of jet engines using hydrogen as fuel. Calculation of thermodynamics of small engine with thrust up to 1 kN which is in modern day used in practice drones or ballistic missiles will be conducted. Given initial parameters compressor selected is of radial type. Calculation of radial compressor and its verification in EES software. Issue of combustion chambers is presented and calculation of chamber balance is carried out. Computation of turbine and blading layout. Proposal of jet for expansion into atmosphere and engine thrust. Comparison of contemporary projects researching hydrogen propulsion in aerospace with their conventional counterparts and assessing their feasibility compared to other types of renewable fuels.
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Optimization of electric power consumption of gasification wood boiler
Fejta, Vojtěch ; Šnajdárek, Ladislav (referee) ; Brázdil, Marian (advisor)
This thesis deals with the optimization of the electrical supply of a domestic boiler. The objectives were description of the legislative requirements for domestic boilers, comparison of their electrical input, description of the design of the main electrical components of domestic boilers, comparison of their parameters, analysis and design of constructional modifications leading to reduction of the electrical input of the selected domestic boiler and implementation of the proposed measures. The thesis is divided into four main chapters, the first two are devoted to boilers and their electrical components. In the third chapter, a new boiler blower impeller and other modifications are designed to reduce the power consumption. The last fourth chapter deals with the design, assembly and testing of these modifications.
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Leakage measurement for hydrogen gases
Spáčil, Petr ; Brázdil, Marian (referee) ; Šnajdárek, Ladislav (advisor)
This master's thesis deals with the measurement of hydrogen gas leaks and addresses key aspects related to hydrogen properties, storage, use, safety aspects, detection methods and seal testing. The study highlights the importance of safety in handling hydrogen and includes a thorough analysis of its properties. It discusses different methods of measuring hydrogen concentration and detecting leaks and assesses the suitability of different gasket materials such as polyester, elastomer, steel and graphite for use with hydrogen. Furthermore, the thesis presents experimental investigations into leakage testing. The findings of the study assist in the selection of the right gaskets and improve understanding of leak measurement techniques, which in turn improves the safety and efficiency of hydrogen applications.
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Computation analysis of the VVER-440 nuclear power reactor core
Máca, Pavel ; Šnajdárek, Ladislav (referee) ; Katovský, Karel (advisor)
This thesis is focused on effect of fuel assembly rotation on the reactor core optimization in VVER-440 reactor. In the first part of this thesis, a brief description and main parameters of VVER-440 reactor are introduced. Next chapter is focused on the Dukovany NPP reactor core design, where these reactors are in operation, together with evolution of used fuel assemblies and reactor core design optimization. The practical part of this thesis includes a comparison of reactor core design optimization with and without fuel assemblies‘ rotation. Furthermore, a so-called multiple rotation method is investigated, which could be more suitable compared to the currently used one.
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