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Analysis of heat losses of operated heat exchangers
Sýs, Tomáš ; Babička Fialová, Dominika (referee) ; Jegla, Zdeněk (advisor)
The proposed bachelor’s thesis deals with calculation and analysis of heat losses of operated heat exchangers used for food applications. In the first part of the thesis, general problematics of heat exchangers is introduced, including their use and breakdown by basic categories, as well as problematics of insulation, which is supplemented by a list of the most commonly used types of insulation. Another chapter is devoted both to the assignment and description of the industrial case; drawing documentation and measured input data necessary for the calculation of heat losses are also presented. The last part of the thesis introduces the used method of assessment of heat losses of the heat exchanger network, achieved results and their discussion.
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Conceptual design of a specific industrial process
Beneš, Daniel ; Babička Fialová, Dominika (referee) ; Jegla, Zdeněk (advisor)
This bachelor thesis deals with the conceptual design of the specific industrial process for the thermal destruction of residual ozone using the Pinch Technology method. In the theoretical part of the thesis, the issue of production, use and destruction of ozone is summarized. The theoretical foundations of the Pinch Technology method for conceptual process design are also introduced. The practical part of the thesis deals with the conceptual design of a specific process for the thermal destruction of residual ozone, based on specified industrial data, with a technical-economically optimal heat exchange size, including a subsequent decision on a suitable heat exchanger for this process.
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Process pipeline design
Motyka, Ondřej ; Babička Fialová, Dominika (referee) ; Jegla, Zdeněk (advisor)
This bachelor thesis deals with the description of each areas and activities in designing pipeline routes for process equipment, that the designer or constructor has to propose properly and appropriately. First part of this bachelor thesis is focused on the theoretical knowledge and necessary knowledge for the design of a functional route for process equipment. Also, more detailed description of the designing the pipeline can be seen in the first part, such as pipe gripping, thermal expansion, corrosion and pipe insulation. The practical part will deal with the individual steps in creating a project according to the task from engineering organization and creating drawing documentation using the available software. The aim is to describe the procedure for working with this software and the subsequent introduction of this knowledge into the practical design of pipeline routes.
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Flow Distribution in Equipment with Dense Tube Bundles
Babička Fialová, Dominika ; Jegla, Zdeněk (referee) ; Turek, Vojtěch (advisor)
Significant maldistribution negatively influences performance of equipment containing dense tube bundles and, moreover, it can cause a wide range of operating issues. This thesis therefore focuses on analysis of fluid flow in complete distribution systems via computational fluid dynamics (CFD). Data obtained from simulations carried out using the software ANSYS Fluent were also statistically analysed. Influence of system arrangement, tube bundle parameters and operating parameters on flow distribution non-uniformity and pressure drop was investigated. According to the results, system arrangement is the crucial differentiating parameter in terms of flow distribution as well as pressure drop. Additionally, data obtained via the classical CFD approach were compared with those yielded by a simplified CFD model for three selected distribution systems. Simplified CFD approach can - given its low computational demand - be utilised in optimization algorithms as well as in the course of the initial stage of equipment design process. Furthermore, this thesis discusses a simulation tool which is based on the simplified CFD approach. Although this tool is still being developed, the results it yields are very promising.
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Complex analysis of the performance of a U-type distribution system
Sýs, Tomáš ; Strouhal, Jiří (referee) ; Babička Fialová, Dominika (advisor)
Fluid flow maldistribution plays a key role in equipment used in process and energy industries, although its evaluation is often underestimated or fully neglected. Uneven flow distribution may cause thermal or mechanical load on the tube bundle, and in extreme scenarios, it can also have an adverse effect on the process efficiency. This thesis aims to find the optimal computational tools for flow distribution prediction suitable for the initial stage of the equipment design process and to identify suitable settings of these tools for their subsequent industrial deployment. The results of simplified analytical models, detailed numerical simulations, and experimental measurements were compared for the dividing header and the U-type distribution system. It was found that the results provided by simplified mathematical models, the solution of which is also significantly less time-consuming compared to detailed CFD simulations, best correspond to the measured experimental values in all modeled configurations. For arrangements with higher lateral resistance coefficient, both computational approaches provide approximately equally accurate results. However, for arrangements with lower lateral resistance coefficient, the deviation of the results obtained by CFD calculations from the experimental data is significantly larger.
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Thermoregulatory generator for a small combustion boiler
Kováč, Samuel ; Babička Fialová, Dominika (referee) ; Jecha, David (advisor)
With increasing requirements for the full use of the heat that is produced, the effort to use waste heat is also increasing. One of the possibilities for such heat is the direct conversion of thermal energy into electrical energy. A device called a thermoelectric generator (TEG) is used for this purpose. Nowadays, it is in the constant development part of their existence. The limiting active substance is the known thermoelectric materials. Nevertheless, this technology finds its use in practice. This work is characterized by the basic principles of thermoelectric conversion, the materials discovered so far and their efficiency, and lastly the TEG patients in a lump wood gas boiler. The main idea of the project, which is ongoing in cooperation between BUT and Ecoscroll, is the development of a small combustion device, a household boiler for wood fuel with manual attachment, which would meet the emission parameters of the Ecodesign Directive 2009/125/EC, can function independently of the connection to the electricity network.
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Inner geometry optimization of flat-panel photobioreactor
Hlaváč, Ivan ; Babička Fialová, Dominika (referee) ; Rebej, Miroslav (advisor)
This master thesis focus on optimatization of flat-panel photobioreactor. The optimatization was performed using CFD models and Design of experiement. The CFD model used for the optimatizaion was before performing the experiment validated with real experiment data. Hydrodynamic parameters affecting microalgae yield were monitored during CFD calculations. They were: gas holdup, gas velocity, turbulent kinetic energy, dead zone ratio. interfacial area and shear stress.The photobioreactor with a stirrer and with vertical baffles, which were selected based on research, were compared. The higher values of hydrodynamic parameters were reached with a stirrer. Baffels were evaluated as more suitable for microalgae, which are more sensitive to shear stress.
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Opportunities for 3D printing in the process industry
Haltmar, Jakub ; Jegla, Zdeněk (referee) ; Babička Fialová, Dominika (advisor)
This bachelor thesis deals with the possibilities of using additive technologies in the process industry, especially in the field of heat exchangers (heat sinks), membrane distillation and structured packing. In the first part, the thesis provides an overview of the materials and additive technologies used in these process units. The next part is devoted to specific examples of the use of 3D printing in the process applications and their comparison with conventional manufacturing technologies in the world. Furthermore, an overview of supported projects according to the Research, Development and Innovation Information System projects and the market situation in the Czech Republic is outlined. Recommendations for the development of additive manufacturing in the process industry are proposed in the discussion. In the addressed area, process improvements (efficiency, performance or completely new applications) are most often achieved due to the ability of additive manufacturing to produce complex geometries increasing the functional area while maintaining built-up dimensions and materials specific to the process industry.
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Selection of a solar water heating system for a garden greenhouse
Šplíchal, Jan ; Babička Fialová, Dominika (referee) ; Jegla, Zdeněk (advisor)
The Bachelor thesis deals with selecting a suitable solar water heating system for a garden greenhouse in a specific location in the Czech Republic. The selection of the suitable water heating system itself is carried out based on an overview of commonly used systems of solar heating and by evaluating competitive designs for said garden greenhouse with regards to its layout and location. A part of the thesis focuses on a measured data set showing the real-world behavior of the garden greenhouse in different parts of the year with the purpose of theoretical calculation of essential parameters, which are needed for an indicative calculation of the collector area needed for selected water heating system. The achieved results and parameters are summarized and with them a real potential of the solar water heating system for said garden greenhouse and its value in the sense of prolonging the period of using the garden greenhouse for growing plants in cold spring and autumn months is recognized.
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