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Verification of the model for predicting the properties of the combustion process
Horsák, Jan ; Kilkovský, Bohuslav (referee) ; Jegla, Zdeněk (advisor)
This work thoroughly analyzes a previously created computational model for predicting characteristic properties of the combustion process in an experimental combustion chamber. Any found shortcomings of the original model are removed and the model is further improved prior to its application on 11 real cases of combustion tests performed at various conditions and with various fuels. Data provided by the model are confronted with the data obtained during the combustion tests and the model accuracy is evaluated, based on local heat flux along the length of the combustion chamber. Finally, the overall usefulness of the model is determined by the means of evaluating the acquired accuracy values, and further possibilities of model improvement and use are presented.
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Advanced methods of application of thermal techniques in the design of heating buildings
Mikoláš, Petr ; Vyhlídalová, Karolína (referee) ; Horák, Petr (advisor)
The diploma thesis is divided into three parts. The first part is theoretical devoted to the introduction of BETONG building material. And next It is also devoted to themes of low - energy buildings and nearly zero-energy buildings, heat sharing and thermal comfort. In the second part is the concept of the heating system elaborated in three variants of the design in the scope of the study for the new family house. The third part is devoted to use of shell blocks of the BETONG with internal contact insulation compared to other masonry systems.
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Simulation of thermally activated foundation structures of buildings
Sliva, Matěj ; Adam, Pavel (referee) ; Šikula, Ondřej (advisor)
Diploma thesis deals with geothermal foundations. The aim of the thesis is to find optimal way of pipe winding for heat-carrying liquid in foundation piles. The problem is solved by CFD simulations in ANSYS Fluent. Determinative parameters like the pressure loss, heat fluxes and U-value in one pile circuit with two ways of pipe installations – Single coil, where reverse pipe is led in the middle of pile and Duplex Coil with reverse pipe in spiral shape are observed.
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The Influence of the fuel used in the burner for heat transfer in process furnaces
Jaworská, Petra ; Zejda, Vojtěch (referee) ; Skryja, Pavel (advisor)
This diploma thesis is about an influence of technical gases CO2 and N2, that are present in a fuel, over overall combustion process and a flue gas emissions. The first part of this thesis discussed issues like heat transfer, basic process combustion utilities, used technical gases in experimental part and finally description of observed pollutants. Second part of thesis describes the experiments themselves. Experiments were trying to find how selected parameters were influenced by adding 40 mN3/h or 80 mN3/h of inert gases to a flow of natural gas. Observed parameters were namely emission volumes, flame parameters and maximal heat duty. Experiments took place in horizontal water-cooled combustion chamber and were performed on two different types of burners. Evaluation of results confirmed clear connection of inert gases on temperature of flame; the biggest temperature drop was observed while inert gas CO2 was present in fuel. Lowering of temperature spikes also highly influenced presence of NOx in hot flue gas during all performed trials.
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Effect of activator type on rheology of alkali-activated slag
Markusík, David ; Smilek, Jiří (referee) ; Bílek, Vlastimil (advisor)
This work deals with rheology of alkali-activated slag pastes (AAP) because of importance of these properties in building connectors for processing and application. The effects of different concentrations of sodium and potassium hydroxides activation solutions on the rheological properties of prepared AAP are examined. For the basic characterization of activation solutions, rotational and rheological measurements of AAS were made, and were compared to measurements from the flow table. Dependences of setting time on the activator concentration and rheological and calorimetric monitoring of hydration progress were also investigated. The findings prove a major influence of concentration and activator type on any determinations made. In pastes activated by potassium hydroxide, fluidity increases with increasing concentration, which correlates with increases in values on the shake table. In case of sodium hydroxide, with the increasing concentration, fluidity increases up to 25 wt. %. The following sharp reduction in fluidity correlates to the values on the flow table as well as with the storage modulus courses from oscillation measurements. In the first minutes after mixing, there was evidence of a sharper increase in yield point for pastes with higher activator concentrations.
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Polyfunctional Building
Holub, Ondřej ; Kopřivík, František (referee) ; Košíčková, Ivana (advisor)
Diploma Thesis „Polyfunctional building“. The work deals implementation project of polyfunctional building in Jihlava. Object is situated on Jihlava suburb in emerging part called „Horní Kosov“. Land is gently sloping from west to east. It continues for Buková street. The building has six floors and a basement. The basement is made from monolithic reinforced concrete. It is used as garages. Floors are made of ceramic bricks with isolation . First floor contains four commercial premises and main entry for housing part. Seventeen flats are situated from second to sixth floor. Sizes of apartments are 1+kitchen corner to 4+kitchen corner with terraces and balcony. Roofing is solved with simple flat roof. Heating will be ensured with central heating. Every apartment, commercial premises, shared premises are going to have it’s own gas boiler. Polyfunctional building is connected on a local road – Buková street, which is connected to new communication. Within multifunctional building twenty parking slots is designed at the basement. Next fourteen parking slots is designed outside.
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Thermomechanical tire model
Vaníček, Jan ; Štětina, Josef (referee) ; Porteš, Petr (advisor)
This diploma thesis is about thermomechanics of passenger car tires. The research part dealing with existing tire models is followed by the practical part. The practical part is based on the designs of thermomechanical models. The first model determines a dependence of temperature on the air pressure inside a tire when a temperature changes. The second thermomechanical model captures all the heat fluxes which affect a tire while a vehicle is in motion. The third thermomechanical model calculates temperatures of parts of the tire during driving tests. All models are programmed in MATLAB.
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An assessment of returnability of solar collectors installation in low-energy family house
Hrbata, Jiří ; Pešek, Martin (referee) ; Jaroš, Michal (advisor)
Increasing of standard of living, automation and mechanization of production and industrial growth lead into energy need growth. At the same time the energy prices continuously rise and it is still more preferable to use renewable energy, particularly solar radiation. This thesis contains basic information about usefulness of solar radiation, solar collectors and ways of their integration into heating systems. Particularly, it deals with the assessment of returnability of solar collectors instalation in the low energy family house. It contains calculations of necessary heat for heating, hot water heating and energy gains from solar collectors. Returnability assessment is demonstrated on concrete example.
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Construction of synthetic skin type sensors
Ropog, József ; Vdoleček, František (referee) ; Zuth, Daniel (advisor)
This master’s thesis deals with the diagnosis of thermal environment using synthetic skin type sensors. The synthetic skin type sensor is a compact sensor ideal for simulating human skin. The aim is to design and implement such a sensor and test its properties. On the market there are no compact sensors with that kind of abilities and our goal is to design the cheapest, but still viable sensor. Measurement and data processing is implemented using measurement cards and LabVIEW software. The work also contains a design of signal conditioning without the use of measurement cards.
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The influence of the combustion air temperature on parameters of the combustion process
Šimeček, Radek ; Hudák, Igor (referee) ; Skryja, Pavel (advisor)
Tato diplomová práce se zabývá předehřevem spalovacího vzduchu a jeho vlivem na parametry spalovacího procesu. V teoretické části je zpracován přehled nejčastějších znečišťujících látek z průmyslového spalování. Je popsána aktuálně platná relevantní legislativa v Evropské unii a jsou porovnány její implementace do národní legislativy v České republice a v Německu. Dále je provedena klasifikace hořáků z hlediska různých kritérií a rešerše předchozí práce v oblasti předehřevu spalovacího vzduchu. Na zkušebně hořáků byla provedena experimentální studie dvou různých hořáků na zemní plyn při konstantním tepelném příkonu 750 kW se spalovacím vzduchem předehřátým až na 250 °C. Výsledky odhalily pozitivní vliv předehřevu na účinnost spalování. Množství emisí NOx a CO naopak rostlo s teplotou spalovacího vzduchu.
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