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Foundation of a New Company
Bárta, Martin ; Hájek, Jiří (referee) ; Koráb, Vojtěch (advisor)
The aim of the thesis „Foundation of a New Company" is the preparing and elaboration of a business plan which is addressed to commercial camps’ organizations and educational activities for children and adults. This work is composed of two parts. The general section is devoted to the theoretical foundations which form the basis for practical part. The practical part includes an analysis of business. Based on this analysis were created business plan to establish the small business. The work closes with the final summary and recommendations which are contributed to an establishment and to a further development of the small business in the future.
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Development of computational tool for engineering
Komiš, Jan ; Hájek, Jiří (referee) ; Vondál, Jiří (advisor)
The thesis aims to provide insight into the use of Python in engineering calculations. The thesis has been divided into a theoretical and practical part. The theoretical part introduces Python and its possible uses in the field of engineering. The second section of the theoretical part describes key choices of study resources and provides instructions on how to set up Python from the perspective of a common user. The final part of the thesis deals with the choice of appropriate libraries (SciPy, NumPy, Cantera, etc.) and shows how these can be used practically in specific tasks from the fields of thermomechanics and hydromechanics.
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Mathematical model of solar drying of sewage sludge
Ficza, Ildikó ; Houdková, Lucie (referee) ; Hájek, Jiří (advisor)
Solární sušení je mimo jiné energeticky nenáročná a tudíž vysoce ekologická cesta pro zpracování kalů z malých čistíren odpadních vod. Výsledkem tohoto procesu je produkt, který je velmi dobře použitelný v zemědělství jako přírodní hnojivo. V rámci této práce bude sestaven zjednodušený dynamický model sušení vrstvy kalu s jednou prostorovou souřadnicí. Tento model bude diskretizován pomocí vhodné numerické metody a bude provedena jeho implementace do výpočtového programu v prostředí MATLAB.
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Fine particles emitted from a heat source into the indoor environment
Hájek, Jiří ; Köbölová, Klaudia (referee) ; Pospíšil, Jiří (advisor)
This bachelor's thesis deals with fine particles emitted to indoor space during combustion in fireplace stowes. The beginning of work is focused on the description of biomass and its combustion. In the following part the pollutants, which are produced by combustion of bio-mass are mentioned, and last but not least is attention focused on current air quality in Czech Republic methods of measure of solid pollutants and measuring equipment. Calculation of concentration is closely described in the experimental part, and then the data, which was measured on different modes of operations of fireplace stowes, is presented.
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Analysis of Interactions in Waste Management
Szásziová, Lenka ; Hájek, Jiří (referee) ; Hrabec,, Dušan (referee) ; Stehlík, Petr (advisor)
PhD thesis deals with the application of simulation, forecasting and optimization methods in the waste management. An introduction describes current state and outlook in the waste management in the Czech Republic. The following chapter analyzes the available data base in the field of the waste management in the Czech Republic, focusing on the specifics and problems such as variable availability of spatially and hierarchically structured, heterogeneous input data. The core work is the computational tool named Justine, which represents the balance system, ensuring consistency of values for the standalone and aggregated data, in terms of their composition and distribution in intended area and time. Development of the tool was motivated by the need to predict the production and composition of various types of waste. The application of the concept is shown in three case studies, focusing on the prognosis of hazardous waste, the forecast of production and composition of municipal solid waste and components of separated waste collection, and estimation of the waste with waste-to-energy potential, all in the Czech Republic. The outputs of the tool represent valuable inputs for the related optimization supply chain models, which are used e.g. for the design of new waste-to-energy facilities.
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CFD modelling of pipe flow mixing of liquids
Pavlíček, David ; Hájek, Jiří (referee) ; Juřena, Tomáš (advisor)
This work is focused on computational modelling of mixing fluids in pipeline with static mixers. Main objective is to analyze several selected static mixers in a particular industrial application, namely dosing of the aluminium sulphate solution in the clarification process for potable water treatment. The analysis focuses on the degree of mixedness and pressure loss of individual mixers. Further, the aim of this work is to process the search of available types of static mixers. The benefit of this work is at least an effort to motivate the reader to deeper understanding of the mixing fluids, especially by static mixers.
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Overview of information resources on biomass combustion
Komárek, Martin ; Bělohradský, Petr (referee) ; Hájek, Jiří (advisor)
The Bachalor's work is concerned to the mapping of the information resources in the area of biomass combustion. The main aim and theme on wich is the work mainly focused on, is to introduce basic, as well as related information sources, which from is possible obtain useful and valuable datas for any further manipultion together with research of biomass combustion and scene field of energetics, as the integral part. Significant attention in each chapter si aslo put on the gathering practice - oriented and applied informations.
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Calcination model developement for ANSYS Fluent
Anderle, Milan ; Hájek, Jiří (referee) ; Vondál, Jiří (advisor)
The aim of the diploma thesis was creating a decarbonisation model of lime, implementation the model into CFD tool ANSYS Fluent and to test the decarbonisation model in a model of a real reactor. The required model was based on assumptions for a Shrinking Core Model (SCM). The main objective of this work was the non-catalytic conversion of substances and the search for the most used mathematical models for calcination. The CFD calculation, the sensitivity analysis and the Fluente parametric study were used. Data on the composition of gas flow, temperature, pressure and mass flow of limestone particles were selected for input variables. The particle model called Multiple Surface Reactions (MSR), which is a standard part of Fluent, was used at first. Subsequently, a UDF which was based on the SCM assumptions was written in the programming language C. The results of the CFD calculation were compared with the experimental values from the dissertation. It has been found that the MSR is sufficiently precise for calculation purposes but neglects the internal diffusion of CO2 through the CaO layer which forms behind the reaction front during calcination. It was found that it is possible to solve the flow with ongoing calcination without the need to know the parameters of the Arrhenian equation if the UDF is used. The created UDF incorporates the influence of intraparticular CO2 diffusion on the overall reaction rate.
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