National Repository of Grey Literature 67 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
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.
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.
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.
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.
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.
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.
Boiling crisis of advanced nuclear fuels
Bírošíková, Martina ; Milčák, Pavel (referee) ; Šnajdárek, Ladislav (advisor)
This diploma thesis deals with a theoretical description of the boiling crisis during intensive heat transfer between the outer surface of the fuel and the coolant and research of the materials and coverage of fuel assemblies with emphasis on the importance of accident tolerant fuel with higher accident resistance. The experimental part ot the work determines the critical heat flux on the examined test sample and interprets the results obtained several times by repeated measurements.
Impactor for fine particle collection
Paulíková, Kateřina ; Šnajdárek, Ladislav (referee) ; Pospíšil, Jiří (advisor)
This master thesis provides an overview of fine particles contained in the air and possibilities for their analysis, measurement and capture. In the beginning, the fine particle's size and origin is described. Then, the influence of fine particles on human health is stated. Next, methods of air analysis and fine particle's measurement are presented. Legislation for emissions and immissions in the Czech Republic is summarized. Finally the selected types of impactors are introduced. The practical part consists of three chapters. First chapter contains the fundamental calculation procedure and its subsequent refinement. In the following part the comparison of the calculation procedure with the parameters of the commercial impactor is provided. Lastly, the design of the impactor is created for the specified parameters using the developed calculation procedure.
Analysis of the usability of a reduction-cooling steam uniton the principle of a vortex tube
Vintr, Lukáš ; Šnajdárek, Ladislav (referee) ; Škorpík, Jiří (advisor)
The aim of the thesis was to describe the current issues of the reduction-cooling station, vortex tube, comment on its use and the design a classic reduction station as the first case. The second practical part was an analysis or comparison of a reduction cooling station operating on the principle of a vortex tube with a conventional one. At the end of the thesis, the problem of determining the radius for the total number of pairs taken is explained. The problem is caused by the instability of potential vortex, which arises mainly because we want to take away matter, but we need to conserve energy. The assumption for the total number of pairs is that it will be more than 10 times higher than the standard variant of the reduction cooling station. From the principle of the vortex tube and the available results, it is clear that the device could be used only for cooling, not for reduction.
Condenser design of a nuclear power plant
Hejduk, Michal ; Šnajdárek, Ladislav (referee) ; Milčák, Pavel (advisor)
The topic of this master´s thesis is the design of the steam generator for a nuclear power plant with VVER 440 reactor. The first part of this thesis describes a brief history of nuclear research, which is followed by an overview of nuclear reactors used now. The next part deals the types of steam the types of steam generators used today with their basic elements and design recommendations. The last and final part is the design of a steam generator for nuclear power plant with a VVER 440 reactor. Above all, is the thermal calculation of the steam generator and behaviour of steam generator depending on the reactor power. The design solution of steam generator and its strength calculation. The last part of the steam generator calculation the pressure loss of the steam generator is investigated.

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