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Optimization of cogeneration system
Stacha, Radek ; Turek, Vojtěch (referee) ; Jegla, Zdeněk (advisor)
Master thesis is focused on optimization of cogeneration system for purpose of rating optimization methods and evaluating properties of these methods. For each method there is description together with block schemes. First part of thesis is devoted to description of methods and their comparison. Second part consists of development of hybrid algorithm, which is used to optimize cogeneration systém model. Each algorithm compared is together with hybrid algorithms included in annexes.
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Waste Incineration II: Flue Gas Cleaning Equipment
Albrecht, Jan ; Juřena, Tomáš (referee) ; Turek, Vojtěch (advisor)
Description of the thermal treatment methods dealing with wastes is a major concern of the present study. Emphasis is placed on equipment and methods for purification of waste gases created in the process of thermal destruction. Considering that the efficiency of flue gas treatment is dependent not only on the activity of flue gas equipment elimination, but is completely dependent on a whole unit of operating incinerators, we can not focus exclusively on the block of flue gas treatment. Therefore, in the study there are given a description and drawings of equipment for thermal processing of waste. First part of this thesis addresses the koncept the concept of "waste", its definition, classification and possibilities for treatment or recovery. The whole thesis is also written with emphasis on current legislation relating to waste and thermal processing.
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Innovation of Project Methodology in Company Pontech
Beránek, Jan ; Turek, Vladimír (referee) ; Smolíková, Lenka (advisor)
Presented master thesis deals with project management. Thesis describes in detail methods used for project management and the project management life cycle. The aim of this thesis is in innovation of project methodology in company Pontech s.r.o. In written down methodology are described processes occurring in all phases of managing projects, which are important for effectiveness.
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Expats and the "Wall of Czechness": An Ethnography of Expat Spaces in Prague
Turek, Veronika ; Verbuč, David (advisor) ; Jurková, Zuzana (referee)
This research project explores the notion of spaces and place-making of expat women living in Prague. Using the metaphor of a "wall of Czechness", this paper identifies why perceptions of living in a given space matter, as these perceptions affect how one interacts with the spaces around them. This metaphorical "wall" thus identifies why expat women find and create their own expat communities for socialization in Prague. As such, online platforms, such as Facebook, aid in creating designated women-only spaces, that facilitate both online and offline interactions. This helps in the creation of place-belongingness, especially for expat women who move to Prague on their own account. This work calls attention to the importance of various spaces associated with place-making in this context: safe spaces, private and public spaces, counter-public spaces and gendered spaces. It also highlights the importance of community- creation, and how communities can be understood and created for these expat women living abroad. The term "expat" itself has specific connotations, and whilst they fall under the category of migrants, the two terms hold very different meanings. This paper adds to existing research on expatriates, as a migrant group, to better understand how they create places, and places of belonging, in...
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Modeling of process and power equipment fouling by solid pollutants
Strouhal, Jiří ; Turek, Vojtěch (referee) ; Hájek, Jiří (referee) ; Jegla, Zdeněk (advisor)
Modelling of particulate fouling based on Computational Fluid Dynamics enables to detect a risk of deposit development and to propose improvements in operating conditions and equipment design. The work focuses on the transport and sticking of solid particles. The size of the particles lies in the range from several up to dozens of m. The conditions correspond to the deposition of particles with a negligible liquid fraction and the deposition occurs due to particle deformation, gravity, adhesion, wall surface roughness, deposit deformation and dynamic friction. An emphasis is put on the selection of a suitable sticking model from the group of critical velocity models, which aside from the local conditions and the particle properties account for the impaction velocity. Sensitivity studies on the model settings were conducted to assess the significance of the model parameters and the included phenomena. The simulations were conducted on the case of an experimental facility for solid fuels combustion. Obtained results were compared to observed deposits.
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Simulations of Photobioreactors from Hydrodynamics and Mass Transfer Point of View
Rebej, Miroslav ; Turek, Vojtěch (referee) ; Jördening, Alexandra (referee) ; Jegla, Zdeněk (advisor)
Simulations of photobioreactors with microalgae-specific cultures is a field that connects microbiology with the multiphase fluid dynamics. With microalgae cultivation, it is necessary to account various phenomena, e.g., multiphase hydrodynamics with water, CO2 bubbles and microalgae, multiphase species mass transfer, radiation transport, light attenuation, growth and culmination of microalgae and their effect on fluid properties. Computational model presented in this doctoral dissertation thesis links multiphase hydrodynamic model and the species mass transfer model. In the thesis, there is an overview of applicable computational models for the given types of photobioreactors. The multiphase hydrodynamic model and the species mass transfer model then draw from this overview. Next, the accuracy of these sub-models was compared with laboratory experiments. As a result, the developed computational model of the photobioreactor can be further extended with other sub-models, i.e., the irradiation model and the biomass growth model.
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Parametric Generator of Heat Exchanger Tube Bundle Mesh for OpenFOAM
Petrů, Martin ; Juřena, Tomáš (referee) ; Turek, Vojtěch (advisor)
This thesis deals with the basics of computational fluid dynamics (CFD), the reasons for its use, and the related necessity to create computational meshes. The next part of the thesis focuses on assessing the quality of computational meshes and, briefly, on computational methods of CFD. The available mesh generators are also compared, and an overview of meshing capabilities is provided. The following is basic information about the OpenFOAM software and its capabilities, in particular the creation of meshes using the blockMesh application. The following part of the thesis is focused on the description of the developed application and its functions for generating a high-quality computing mesh of a tube bundle heat exchanger for the OpenFOAM software. In conclusion, a steady flow simulation verifies the correctness of the created mesh and its sufficient quality.
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Design of modular tubular heat exchanger
Marx, Sven ; Turek, Vojtěch (referee) ; Jegla, Zdeněk (advisor)
Hlavním cílem této práce je seznámit se s požadavky specifické procesní aplikace a návrhem výměníku tepla s křížovým tokem pracovních látek a zhodnotit návrh předmětného výměníku pomocí simulačního softwaru. Nejprve jsou v práci prozkoumány provozní podmínky rekuperace odpadního tepla a obecné možnosti návrhu a jsou uvedeny základní rovnice pro tepelný a hydraulický výpočet. Hlavní část práce se zaměřuje na modulární trubkový výměník tepla s křížovým tokem pracovních látek navržený pro experimentální výzkum rekuperace tepla a zanášení ze znečištěných spalin produkovaných spalováním alternativních paliv na VUT v Brně (VUT) na Ústavu procesního inženýrství (UPI). Nejprve je stručně představena situace v testovací laboratoři. Poté je popsán postup návrhu předmětného tepelného výměníku pomocí softwaru HTRI a výsledky jsou shrnuty a porovnány s cílovými požadavky. Následně je analyzována distribuce toku vody v trubkovém prostoru uvnitř jednoho ze čtyř identických modulů výměníku tepla užitím softwaru CDF pomocí tří různých simulačních přístupů. Jsou popsány dva přístupy využívající model turbulence k--SST a jeden přístup využívající model turbulence k--Realizable turbulence. Nakonec jsou diskutovány rozdíly mezi přístupy a výsledky simulací distribuce toku.
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Study on the potential of an integrated waste-to-energy unit
Freisleben, Vít ; Turek, Vojtěch (referee) ; Jegla, Zdeněk (advisor)
This diploma thesis is focused on the design of technological modifications of the existing industrial unit „waste-to-energy“, used for thermal treatment of process waste gases containing VOC and CO while flue gas is produced. The main objective of the existing unit modification is to improve its operating parameters considering economy, ecology and energy utilization. In the first part, the current industrial plant was presented with all necessary process data. Furthermore, all the key equipment used for the waste gases treatment or for the utilization of waste heat was identified. In the main part of the thesis there are performed modifications of the existing unit including the technology of existing heat exchangers intensification, the design of new and more efficient heat exchangers and finally the catalytic oxidation technology implementation for the decomposition of pollutants contained in the waste gas. The result of the thesis is a technical, economic and ecological comparison of the proposed technological modifications with the existing operation.
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Simplified flow distribution modelling
Rebej, Miroslav ; Vondál, Jiří (referee) ; Turek, Vojtěch (advisor)
Tato diplomová práce se zaměřuje na modelování proudění tekutiny v paralelních distribučních systémech, kde hraje důležitou roli rovnoměrnost distribuce tekutin. Pro tento účel je vytvořen vlastní CFD kód. Kód je napsán v programovacím jazyce Java a používá ke zlepšení výkonu knihovny třetích stran, které se vyznačují přímým přístupem ke hardwarovým a systémovým prostředkům. Kód se také vyznačuje určitými zjednodušeními, u nichž se očekává, že sníží výpočetní časy. Vliv použitých zjednodušujících opatření je vyhodnocen porovnáním výsledků simulací proudění na několika geometriích s údaji získanými z podrobných modelů CFD. Geometrie použitých svazků trubek se odlišují různými uspořádáními toku a trubek a také různým počtem trubek.
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