National Repository of Grey Literature 68 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Feasibility study pumped storage hydropower plant in a particular locality
Vaněk, Michal ; Štigler, Jaroslav (referee) ; Hudec, Martin (advisor)
Electric energy storage represents an area, which needs to be further developed in order to accommodate more installed capacity of wind and solar power plants in the electric grids. Pumped hydro energy storage still remains ahead of other storage technologies in terms of achievable storage capacity. However, environment protection which is one of the obstacles for further PHES development in Europe causes significant reduction of suitable sites. It is therefore useful to examine also those sites, which seem to be less favourable for PHES at the first glance. This thesis deals with a feasibility study of a PHES on place of a former graphite surface mine. The thesis includes computation of basic capacities, choice of a suitable machine arrangement and introduction into PHES feasibility issues in electric grids. Two possible solutions of a smaller PHES that differ in their capacities were suggested based on available materials about the site as well as on available materials from Francis pump turbine model research. In case of both solutions a binary machine set is used and the available capacities are in small tens of megawatts. However, there is a wide head variation at the site, which causes significant power variation. Concerning the feasibility of the PHES, it is very uncertain that the participation in the day-ahead electricity market, would provide enough revenue to cover operation and capital costs. A following economic analysis investigating the capital costs of this particular PHES would be beneficial, as well as more detailed design of the reservoirs.
Analogies in fluid dynamics: vortex as a black hole
Staňo, Šimon ; Štigler, Jaroslav (referee) ; Illík, Jakub (advisor)
This bachelor thesis discusses the various analogous connections of fluid dynamics with the fields of electricity, electromagnetism, quantum mechanics and gravity. Par- ticular attention has been focused on a certain similarity between rotating black holes and the draining bathtub vortex. At first sight different phenomena that can be ex- plored by simulating known phenomena. The behaviour around real black holes can, with some simplification, be studied within the hydraulic laboratory. The pioneer of this idea is W. G. Unruh, whose work was followed up and continued with research by Silke Weinfurtner. Her research served as the inspiration for the exploration of this field in this bachelor thesis. It is possible to visualize the event horizon of a black hole or the boundaries of the ergosphere, it is also possible to observe more complex phenomena such as superradiance, backreaction or ringdown. The analogy is not completely precise, but it allows a very complex system to be studied with a simple experiment and can lead to a better understanding of these phenomena. A simple experimental setup was created in the laboratory of Victor Kaplan’s Department of Fluid Engineering.
Design of cleaning robot for industrial air conditioning based on dry ice blasting technology
Novotný, Viktor ; Haltof, Vladimír (referee) ; Štigler, Jaroslav (advisor)
The aim of this work is to design cleaning robot for industrial air conditioning based on dry ice blasting technology, which will be able to clean different types and sizes of pipes. The versatility of the robot was achieved by the adjustability of the different parts and the possibility to add additional components for vertical movement. The possibility of inserting the robot into pipes with entrance holes of different sizes is solved by a modular system. Ease of cleaning was achieved by covering the body. Focus was also placed on the ergonomics of the robot.
Irrigation systems in the past and nowadays
Slinčák, Andrej ; Fialová, Simona (referee) ; Štigler, Jaroslav (advisor)
The bachelor thesis is focused on general overview of problematics of irrigation systems for large agricultural fields, as well as micro-rrigations for gardens. It includes pros and cons of every system and elucidate appropriate aplication of irrigation to certain conditions. Thesis describes elements of irrigation system and conditions for its proper functioning. In the first part is described brief history of irrigation systems, afterwards its division by use and the way they work. I also added short introduction to gravitation (surface) irrigation. It is these techniques, which are used in developing countries with sufficient water resources. The second part is a description of a specific irrigation system from my neighborhood. I have chosen our automatic irrigation system from firm TORO, which is used for lawn irrigation.
Water wheel inflow part optimization
Jirků, Filip ; Himr, Daniel (referee) ; Štigler, Jaroslav (advisor)
Waterwheel, renewable energy, small hydro power plant, optimization, measurement, machine characteristics
Microplastics removing from water
Ermis, Martin ; Himr, Daniel (referee) ; Štigler, Jaroslav (advisor)
This thesis deals with the occurrence of microplastics in water, the reasons for their potential elimination, and the possibilities leading to that. More specifically, it focuses on flotation as a process for removing microplastics from water. Flotation is further described from a theoretical point of view and its mathematical model is developed. The wettability of selected polymers is measured. The experiment performed to determine the efficiency of flotation as a process of treating water from microplastics is described. This efficiency is further compared to measured wettability.
Turbulent flow suppression in pipe
Jahn, Jiří ; Rudolf, Pavel (referee) ; Štigler, Jaroslav (advisor)
This thesis deals with ways to suppress turbulent flow in pipelines. In the first part various methods of laminarization are presented, when the turbulent flow is transformed into laminar flow, including the results of experiments published by the authors. The next part presents the results from CFD. The calculations were performed for one of the methods mentioned in the first part and the results were compared with each other. In addition, several options have been suggested to improve the original method.
Study of heat transfer by turbulent flow in cold helium gas in experiment with Rayleigh-Bernard convection at ISI CAS in Brno
Balko, Marek ; Štigler, Jaroslav (referee) ; Macek, Michal (advisor)
The diploma thesis deals with the study of Rayleigh-Bénard convection for Rayleigh numbers in the range 1E8-1E14. The evaluated data come from an experiment with cryogenic helium in a cylindrical cell in a configuration with cell diameter D = 30 cm, height L = 30 cm and a second configuration with cell diameter D = 30 cm, height L = 15 cm. Miniature sensors recorded temperature fluctuations over time under various physical conditions and properties of helium. Using MATLAB software, the output parameters of the system (Nusselt and Reynolds numbers) and their dependence on the control parameters (Rayleigh and Prandtl numbers) were determined from the measured data. A new approach to the distribution of measured signals according to the direction of large scale circulation was used in the work, which leads to improved analysis. Reynolds numbers were evaluated using the so-called elliptic method. Furthermore, the work deals with the study of the coherent structure of the large scale circulation inside the cell.
New concept of large-area irrigation systems
Pírková, Marcela ; Štigler, Jaroslav (referee) ; Fialová, Simona (advisor)
This diploma thesis is focused on a large-scale irrigation embedded in the urban landscape. The main goal is to find a new concept of the large-scale irrigation system using a minimum of added electrical energy. The system is aimed at rainwater harvesting and distribution in populated areas. Part of the work is the analysis of the zoning plan of the selected locality, the design of the entire system from the accumulation of collected water to the distribution of watering to the root zone of plants. In the practical part, the proposed distribution network is calculated according to the current known equations, and the calculation is finished with the choice of a suitable diameter of the pipeline network. In addition, the work suggests possible sites for new planting of plants.
Design of System for Cleaning Pipes in Prefabricated Houses
Javorský, Samuel ; Řezníček, Svatopluk (referee) ; Štigler, Jaroslav (advisor)
The aim of submitted bachelor´s thesis is to design a rotary brusch cleaner for cleaning air ducts in prefabricated houses putting emphasis on ergonomic and esthetic innovations. After a careful technologic analysis of current market and practical knowledge, a sophisticated, compact and homy design was created. The innovation is an aluminium truss construction, which fixes the basic body of the machine and makes it easier for the worker to manipulate and furtherly storage spaces for working tools were also created. The results of this thesis bring a new perspective on the issue.

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