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Design of a filter unit for waste gas cleaning
Volánka, Lukáš ; Wegschmied, Roman (referee) ; Jecha, David (advisor)
This bachelor's thesis focuses on the design of the filtration unit and on particulate matter, or PM, which is still a significant contributor to air pollution. The first chapter describes the basic properties of these pollutants and their influence on the design of the separator. The next chapter briefly discusses the current legislation in the Czech Republic dealing with emission and air pollution limits. In the third chapter, which is also the last of the theoretical part of the thesis, the individual methods of removal of PMs are presented and explained. The practical part follows, mainly devoted to the design of the filtration unit for the given case, which ends with the measurement of emissions and a brief evaluation of the results.
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Emissions from the burning of garden waste
Kuznetsova, Oksana ; Poláčik, Ján (referee) ; Baláš, Marek (advisor)
This bachelor thesis deals with the issue of production of gaseous and solid pollutants in the incineration of garden waste. The aim was to carry out and evaluate the experiment. During the evaluation, it was found that the incineration of garden waste produces many times more emissions, than the incineration of wood in the boiler. The reason for the high emission concentrations was the fuel composition and the combustion process. Furthermore, fine particles in the range 17.5–532.8 nm were investigated. In the theoretical part, a literary search was created, which was based on Czech and foreign professional literature.
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FEA modelling of synchronous machine
Ficza, Tibor ; Kurfűrst, Jiří (referee) ; Ondrůšek, Čestmír (advisor)
Táto práca sa zaoberá s modelovaním synchronného stroja s permanentnými magnetmi pomocou metody konečných prvkov. K modelovaniu sme si zvolili 3 fázový synchronný stroj s permanentnými magnetmi na povrchu rotora z firmy VUES. Najprv vypočítame parametre stroja a potom spravíme statický model pomocou programu FEMM a Matlab a budeme hladať možné riešenia na 2D dynamický model. Pomocou programu Ansys Workbench spravíme 3D model tohoto stroja budeme a porovnávať výsledky simulácie.
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High-speed outer rotor synchronous machine
Král, Radek ; Knebl, Ladislav (referee) ; Klíma, Petr (advisor)
The master thesis deals with the construction and design of a high-speed synchronous machine with an outer rotor. The thesis is organised into three main chapters. The first chapter deals with machine design theory as well as mechanical limits, which are significant for high speed machines. This chapter also provides examples of applications of these electrical machines. In the second chapter, the initial design of the machine is calculated analytically. This machine design is optimised and the third chapter of this work shows the results of simulations using the finite elements method, including the evaluation of these results.
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Model of synchronous PM machine based on equivalent reluctance network
Sporni, Peter ; Lapčík, Josef (referee) ; Ondrůšek, Čestmír (advisor)
Táto práca pojednáva o problematike vytvárania a simulácie reluktančnej sieti synchrónneho stroja s V tvarovanými permanentnými magnetmi v programe PSpice. Na začiatku sa oboznámime s konštrukciou a parametrami stroja a potom vyvodíme základné rovnice na výpočet každého prvku siete. Vypočítame každý prvok tohto stroja a potom vytvoríme túto sieť v PSpice. Na začiatku je simulovaná sieť statická a všetky magnetické odpory sú lineárne. Neskôr nahradíme lineárne odpory reprezentujúce plechy nelineárnymi a počítame s precovnou teplotou permanentných magnetov. Potom porovnáme naše výsledky s FEM metódou počítanými hodnotami a vypočítame indukované napätie v jednej cievke stroja. Na záver vypočítame výkonovú a momentovú charakteristiku stroja.
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Child exposure to aerosol particles inside bicycle trailer during the usual ride
Nechvátalová, Karolína ; Bendl, Jan (advisor) ; Mašková, Ludmila (referee)
Bicycle trailers represent a popular way of transporting children during cycling, however increased exposure to aerosol particles due to the location of the trailer in the immediate vicinity of the cycle path surface and of the bike tire may pose a health risk. Some aerosol particles can cause respiratory as well as other severe diseases, since the surface of the paths may also contain toxic substances, such as those produced by traffic. Children are more prone to developing respiratory and other diseases than adults, and therefore more attention is needed. The aim of this project is to find out how many times are the concentrations of PM10, PM4, PM2,5 and PM1 aerosol size fractions and the particle number concentrations higher in the trailer in comparison to the cyclist in front of it at different driving speeds while driving on dusty roads and to confirm the hypothesis that the particles are resuspended from the surface of the road and penetrate into the trailer, which has not been quantified so far. The possible health consequences are also discussed in this project. We did three measurements on two roughly 200 m long dusty sections of cycle paths (Stromovka park, cycle path A22 in Braník) in Prague. For the measurement, the trailer (Chariot Cougar 2, Thule) and the box placed on the handlebar...
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Atmospheric aerosol vertical distribution in boudary layer
Dočekalová, Veronika ; Hovorka, Jan (advisor) ; Jančík, Petr (referee)
Particulate matter (PM) air pollution is one of the most important topics in the field of environmental protection, and coal strip mining is a significant source of coarse atmospheric aerosol. In order to implement appropriate regulations to improve air quality, we need to identify the major sources of pollution. PM is usually measured in a ground-based manner and its dispersion is only modelled. Therefore, the objective of this study was to measure concentrations of coarse aerosol in the atmospheric boundary layer above the area of the coal strip mine through experimental airborne measurements and to estimate pollution contribution of mining to the surroundings. Measurements were carried out from November 11 to November 26, 2012, at Vršany coal mine, Czech Republic. An electrically powered airship was used with a specially designed gondola carrying aerosol monitors DustTrak DRX and P-Trak. Temperature and relative humidity data were also recorded. Repeated flights were performed at several heights above mine edge level. PM1-10 and GPS data were recorded every second. Average airship velocity ranged from 6 to 7 ms-1 . Flight measurements were also compared to ground-based measurements of PM10 and meteorological data. Weather during our measurements was characterised by low temperatures, high relative...
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Design of a filter unit for waste gas cleaning
Volánka, Lukáš ; Wegschmied, Roman (referee) ; Jecha, David (advisor)
This bachelor's thesis focuses on the design of the filtration unit and on particulate matter, or PM, which is still a significant contributor to air pollution. The first chapter describes the basic properties of these pollutants and their influence on the design of the separator. The next chapter briefly discusses the current legislation in the Czech Republic dealing with emission and air pollution limits. In the third chapter, which is also the last of the theoretical part of the thesis, the individual methods of removal of PMs are presented and explained. The practical part follows, mainly devoted to the design of the filtration unit for the given case, which ends with the measurement of emissions and a brief evaluation of the results.
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