National Repository of Grey Literature 286 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Storage systems for renewable energy
Švácha, Filip ; Kracík, Petr (referee) ; Poláčik, Ján (advisor)
The aim of the thesis is to describe the current possibilities of storing electricity from renewable sources focusing on hydrogen technologies. In the first three parts, the question of energy sto-rage from renewable sources, the current energy storage options and the actual energy storage in hydrogen are discussed in the form of research. The last part is practical and its aim is to compare the current possibilities in designing a system that stores energy in hydrogen. Subsequently, the most favorable option is chosen and compared to other energy storage methods.
Steam Turbine to Drive the Crusher in the Sugar Factory
Ruzsík, Erik ; Lokaj, Jakub (referee) ; Kracík, Petr (advisor)
The thesis is focused on designing of backpressure steam turbine to drive the crusher in the sugar factory having the power input of the 2 200 kW. Thermodynamic calculation of two conceptual variations is gradually implemented in the thesis with the aim to determine the steam mass flow through the turbine. In the first version the control stage is selected as an A-wheel and in the second version as a Curtis wheel. The stage part of both versions consists of series action stages. Furthermore, it contains basic design of the gland steam system and the nozzle control system. Both radial and thrust bearings are designed based on the acting forces. The thesis also includes strength calculation of the selected components. The final part deals with comparison and evaluation of the optimal solution. Due to the small difference in rotor weight (m =19,72 kg), and especially for the less steam consumption (M = 4,87 kg/s), the first version can be considered as an optimal solution. This thesis is amended by a mechanical drawing of the turbine cross section on a common frame with a gearbox.
Biomass use in district heating
Dlouhá, Kristýna ; Kracík, Petr (referee) ; Baláš, Marek (advisor)
This bachelor’s thesis deals with the utilization of biomass in district heating. The introductory part of the thesis is dedicated to biomass, its division and ways of its utilization for energy purposes. The following section describes in more detail each of the technologies for power generation from biomass. In the third part, a few of our energy cogeneration sources are stated, they use previously mentioned technologies. At the end of the thesis there is a statistical overview of the utilization of biomass in district heating in the Czech Republic over the last 10 years.
Design of Helium liquefaction cycle
Bártová, Jana ; Kracík, Petr (referee) ; Hejčík, Jiří (advisor)
The present master thesis deals with the technologies for gas liquefaction focused on helium. The first part of the thesis contains a description of the history of liquefaction, production and usage of liquid helium, as well as the principles of liquefaction and cooling cycles. In the following part of the thesis is a detailed model of the liquefaction cycle for which radial-axial turbine wheels were designed. The last part of the thesis contains financial analysis of the suitability of using the expander with eddy current brake and the expander with an electric generator.
Degradation of Biomass Fuels during Storing
Elbl, Patrik ; Kracík, Petr (referee) ; Lisý, Martin (advisor)
This thesis aims to deal with degradation of biomass fuels during storing. The first part of thesis is dedicated to research study concerning of biomass in general. There are mentioned properties of biomass, separation, issues of combustion and storing. The second part deals with experimental determination of degradation of fuel during storing and weather conditions.
Condensing steam turbine for a sugar factory
Kovaříček, Jakub ; Fiedler, Jan (referee) ; Kracík, Petr (advisor)
The main topic of the thesis Condensing steam turbine for a sugar factory is a comparison of the methodology for the design of twisted blades of the last low-pressure stages of a condensing steam turbine. The work is divided into the five parts. In addition to the Dunham, Pritchard and Trigg methodologies described in detail, the research in the first part also deals with other, briefly described methods. In the second part, a preliminary calculation of the thermal scheme in which the turbine should be operated is performed. An air condenser is selected behind the turbine. The third part is devoted to the preliminary and detailed calculation of the control degree. The next part deals with the preliminary thermodynamic calculation of the turbine, which has an overpressure blade and is divided into seven flow cones. The content of the following fifth part is a detailed design of the geometry of twisted blades of the last stage. The importance of twisting the blades in terms of efficiency is described here and it is possible to look at the issues of the whole process. The profile of the blades is modeled in detail using two methods and then compared on the mean diameter with the third method, which is modeled only in one section. While the Dunham method is the most time-saving, the generated blade shape is not ideal compared to the more time-consuming methods. The appendix contains a simplified drawing designed for stator and rotor blades.
Small-scale gas heat pump
Poul, Josef ; Kracík, Petr (referee) ; Pospíšil, Jiří (advisor)
The diploma thesis deals with the issue of gas heat pumps. It provides a general survey of heat pumps in the first part and in the second part it aims on proposing settings of a gas heat pump for the given operating parameters. The proposed concept is applied to the specific case study of deployment in the industry with subsequent economic evaluation.
Increased performance turbo machinery in EDU the NPR changing
Bašta, Tomáš ; Kracík, Petr (referee) ; Fiedler, Jan (advisor)
The Diploma thesis on the topic of Increased performance turbomachinery in EDU the NPR changing describes in detail some important devices of technology system of the secondary circuit of Dukovany Nuclear Power Plant together with their task in the thermal circulation. There is a computational model of secondary circuit according to the present thermal schema created in the main part of the thesis. At the end of the thesis, the possibilities of the increase of the terminal power of turbomachinery, specifically of the turbogenerator, by the exhange of low-pressure heaters (NPR) are stated. Obtained results are documented by drawings of the thermal schemes.
Steam turbine for biomass heating plant
Cmajdálka, Ondřej ; Fiedler, Jan (referee) ; Kracík, Petr (advisor)
This master thesis deals with the design of a condensing steam turbine for a biomass block burning wood chips with one regulated take for a hot water heat exchanger. The temperature gradient for the hot water is 90/110 ° C. The thesis guides through the designing proces of a steam turbine from the thermal scheme proposed according to the specified parameters, through the design of the regulatory stage and the stage part of the turbine, including strength calculation, to the design of the compensating piston, seals system and bearings. Finally, the operating characteristic of the turbine is constructed.
Thermodynamic cycles used in power engineering
Suchomel, Josef ; Kracík, Petr (referee) ; Baláš, Marek (advisor)
Power engineering is one of the most important parts of industry. Among other things, it deals with production of electricity, without which many of us can no longer even imagine life. All energy devices can be described on the basis of different thermodynamic cycles. And with these thermodynamic cycles this thesis deals. It lists both, the most important cycles, such as Rankin Clausius cycle, which is the basic cycle of most of the power plants, as well as less known, resp. almost new thermodynamic cycles. The emphasis of the whole work is also focused on the advantages and limitations of the stated cycles and on their application in practise, too.

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