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Natural biomass burning and character of emissions of these processes
Maňo, Martin ; Köbölová, Klaudia (referee) ; Chýlek, Radomír (advisor)
This bachelor thesis deals with the issue of emissions from natural biomass fires. Emphasis will be placed on aerosol emissions that occur during these natural phenomena. The introduction will discuss in general the natural fires of biomass in the world and their impacts. The next part of the work will investigate the factors that affect the composition, size and composition of aerosols, as well as their impact on living organisms and the environment. Methods will also be described for determining whether an aerosol trapped in the environment is of anthropogenic or natural origin. In the last part, the author will deal with the analysis of data from the measurement of real biomass combustion, in which he will participate
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Negative impacts of renewable resources on environment
Kopeček, Marek ; Chýlek, Radomír (referee) ; Sitek, Tomáš (advisor)
Current society understands the need to protect the environment. Renewable energy resources are one of the major topics of environmental protection. Their benefits are reducing greenhouse gas emissions and reducing dependence on fossil fuels. The production process, operation, recycling, and possible accidents of renewable energy resources are investigated in each chapter. Attention was paid mainly to the most used renewable sources. Finally, the negative impacts are evaluated, and it is defined which renewable energy resources could be classified as ecological.
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Proposals for measures to reduce the heat loss of a house
Faltýnek, Michal ; Chýlek, Radomír (referee) ; Baláš, Marek (advisor)
This Bachelor's Thesis addresses the draft measures for reduction of heat loss in a family house. Research is discussed in the first part. It theoretically describes the subject of heat loss, possible ways to reduce it and it also goes over the materials that are used for thermal insulation. The next part of the text describes the house model that is used to demonstrate the calculation of heat loss according to ČSN EN 12831. Subsequently, several precautions are proposed in order to reduce heat loss and financial expenses. The end of my work covers the return of investments based on the precautions as well as the evaluation of their foundation.
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Numerical model of aerosol formation during biomass combustion
Chýlek, Radomír ; Lízal, František (referee) ; Masaryk, Michal (referee) ; Pospíšil, Jiří (advisor)
This thesis focuses on creating a numerical model to describe the thermal impact on biomass with aerosol formation. The model is based on the modification of the network-based CPD model and is intended for simulating the thermal decomposition of biomass. The objective of this work was to verify the functionality of the model and perform comprehensive validation through laboratory measurements. The validation involved analyzing lignocellulosic biomass and its individual structural materials. The validation results confirmed the model’s ability to simulate slow pyrolysis with good agreement with experimental data. Prior research focused on determining the composition of biomass and selecting an appropriate model for biomass combustion/pyrolysis simulation. The thesis also describes other tested approaches and improvements to the CPD model.
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High temperature coatings for gas turbine blades
Chýlek, Radomír ; Brázdil, Marian (referee) ; Šnajdárek, Ladislav (advisor)
The purpose of this bachelor thesis is the overview of technology of high temperature coatings for gas turbine blades. The familiarization with properties of individual coatings, their capabilities to increase the blades durability and their resistance to damage and temperature influences are emphasized in this work. The potential of significant increase of gas turbines efficiency using different types of coating and cooling of the blades was evaluated in this thesis. Additionally the individual coating techniques are described and compared. Last but not least, this thesis contains closer description of the state-of-the-art thermal barrier coatings including the characteristics required for the following computing part. The computing part deals with calculation of heat transfer through the blade. The conclusion is dedicated to the future use of the coatings from the author's perspective.
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Assessment of the measure reducing heat loss residential building
Vašíř, Jan ; Chýlek, Radomír (referee) ; Baláš, Marek (advisor)
Objectives of this thesis are analysis of measurements to decrease energetical consumption of buildings and efficiency calculation of measurements made to concrete apartment building. Thesis is thematically devieded into for parts. First part is theory determinating baisic therminology. Heat conduction and its meaning for heat loss in houses is described in this part. In second part is described meaning of thermal insulation and contains analysis of market with materials including suitability of materials for thermal insulation and windows. In third part is described house which is examined in the thesis. Last fourth part contains calculation consumption of heat and examines why was not fulfiled assuption of designed savings. Financial calculation of how much money was saved and when the investmen was retruned. In this part is also estimated mass of CO2 gas emited by thermaly insulated house versus state in which house is not thermly insulated.
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Vortex tube
Chýlek, Radomír ; Škorpík, Jiří (referee) ; Pospíšil, Jiří (advisor)
The purpose of this diploma thesis was to find optimal operational parameters of Ranque–Hilsch vortex tube that would give the best results of temperature separation, and to create a numerical model of the device. Firstly, extensive research of current literature was done and analytical model of the tube was created. Then, the numerical model of the vortex tube was designed using Star-CCM+ software. Afterward, best fitting turbulence model was chosen to do the calculation and optimal geometrical parameters of the tube were obtained as a result of CFD simulation. Then, inlet nozzles for the tube were designed and manufactured. Experimental evaluation of the vortex tube and description of its optimal settings form a substantial part of the project. Finally, the data obtained from the experiment were compared to the results of numerical analysis and conclusions were deduced.
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Determination of stability of fuel feeding into boiler
Skalický, Michal ; Chýlek, Radomír (referee) ; Lisý, Martin (advisor)
This bachelor thesis deals with the determination of stability of fuel feeding into boiler. The principle of the screw conveyor is described at the beginning of the thesis. It is followed by a description of the individual parts of the worm. The second part of the research deals with the properties of the materials transported. The second half of the bachelor thesis is practical. In this section there are experimentally measured values of flow of sawdust and wood chips. At the end, the measured values are compared and evaluated.
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Use of waste heat of computing systems
Švehla, Michal ; Brázdil, Marian (referee) ; Chýlek, Radomír (advisor)
Using waste heat from computer systems is quiet a new area of research. The goal of this bachelor thesis is to summarize known information from this field, including descriptions of already running data centers. There are described ways of cooling which are used in data centers and mainly possibilities how to use waste heat. In the end there is shown how to evaluate suitability of using waste heat in view of data center power as well as return.
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