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Thermal calculation in design of resistance and induction devices
Krčál, Vít ; Foral, Štěpán (referee) ; Lázničková, Ilona (advisor)
This bachelor’s thesis focuses on thermal calculation of electric heating device and related theory. Selected topics in electric heating technology are explained, followed by the calculation in design of a crucible furnace and its automation using a computer program. The theoretical part first deals with the heat transfer mechanisms and their mathematical description. Further on, the thesis describes how heat is created in resistance and induction heating devices and mentions applications of these types of heating. The main part of the thesis focuses on the thermal calculation of the resistance crucible furnace for aluminium melting. The calculation relates to a cylinder-shaped model of the furnace with determined structure and deals mostly with heat loss, electric power input, thermal efficiency and design of heating elements. The calculation is achieved only in general and it is subsequently automated in Microsoft Office Excel® application. The computer program, which is also a part of the thesis, allows user to change input parameters and see how it affects results of the calculation. In the last chapter, an example of calculation for specific numeric data is presented. The main goal of the thesis is to automate the calculation. That can save some time while calculating and designing a crucible furnace.
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Materials for electric machine winding
Minks, Ondřej ; Ondrůšek, Čestmír (referee) ; Huzlík, Rostislav (advisor)
This work deals with the option of substitute aluminum for copper as winding material in induction motor in several variants and compare them. The advantages and disadvantages of these materials for the application are mentioned. The default element is the machine with power 29 kW, 2p = 4, which is the basis for other variants. It is about the verification of the default copper wire machine with cataloging data and then verification of several aluminum wire variants of the machine. Veryfying the machine designs is performed on the basis of three programs - RMxprt, ANSYS Maxwell and Matlab. In all of these programs, the machine calculations were realized for copper and aluminum winding in point close to the nominal. Final results are evaluated. There are also heat and ventilation calculations of the machine.
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Thermal calculation of direct fired heater
Sénáši, Martin ; Kilkovský, Bohuslav (referee) ; Jegla, Zdeněk (advisor)
The main aim of the thesis is to evaluete properties of a simplified thermal calculation of the direct fired heater published in the journal Applied Energy at 2010 and its application to specific industrial cases. At first, general issues of process heaters are talk over. Second, calculation model in cited article is briefly introduced. After that, custom computational model at program Maple is created in accordance with published article. Subsequently, the model is applied to the existing process furnaces in the form of a check calculation. An integral part of the work is also a detailed discussion of the results obtained.
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Draft of thermal-oil boiler fired with wood chips
Vojtek, Marek ; Frömel, Zdeněk (referee) ; Baláš, Marek (advisor)
This master´s thesis is dealing with thermal-oil boiler fired with wood chips. In the first part is the conception of the boiler, created on the base of the search of thermal-oil boilers producers and defined fuel. In the next section is the heat-transfer, aerodynamic and hydraulic calculation. In the last part is the design of the boiler technologies. In the appendix is the projection drawing which includes all important information for the construction draft.
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Mathematical modeling of district heating net
Pařízková, Iva ; Kracík, Petr (referee) ; Pospíšil, Jiří (advisor)
This thesis is focused on creating an iterative model for thermal and hydraulic calculation of heating net in Visual Basic of Application. Flowing medium considered is hot water. Although data for heating network in Brno are recorded in this model, its use for any other heating network is possible. This model allows also calculation of minimal temperature of the source and calculation of heat loss of every consumer. This is very useful when considering, if supplying some of the consumers with the heat from a local source would not be more effective. The second part of this text is aimed to evaluation of different ways how to reduce the heat loss in heat network for source Červený mlýn. Both current situation and possibilities for the future are considered.
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Draft grate boiler for combustion of sorted waste
Paštěka, Michal ; Svoboda, Petr (referee) ; Baláš, Marek (advisor)
The aim of the master’s thesis is design of grade boiler for combustion refuse derived fuel. There are specified the steam parameters and the fuel-element analysis, based on this analysis are determined stoichiometric calculation. Furthermore is calculated heat balance of the boiler, heat losses and thermal efficiency of the boiler. From the parameters are design main dimensions and parameters heat-transfer surfaces and the boiler.
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Grate Boiler for Wood Chips Combustion
Kozák, Tomáš ; Kohout, Přemysl (referee) ; Lisý, Martin (advisor)
The thesis is dedicated to the design of the steam boiler which burns wood chips, with a natural circulation of the water. It is a grate boiler, which produces 20 t/h of the steam. The output parameters of the steam are 420 °C and 5 MPa. The feedwater temperature is 125 ° C .The thesis gradually deals with stoichiometric calculations and determines the efficiency of the boiler. Then it describes the design of the fireplace and thermal calculations of each heat transfer surfaces. The appendix includes drawings of the boiler.
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The use of waste heat cogeneration units for steam and heating
Jež, Dalibor ; Skála, Zdeněk (referee) ; Baláš, Marek (advisor)
This master’s thesis deals with design of technological system for heating and process steam generation. The source of energy is a cogeneration unit. The thesis is divided into several parts. The first part is design of technological system and description. The second part is realized stoichiometric calculation and the thermal balance of steam boiler. The main part of thesis is design of the waste heat steam boiler. The thermal calculation, aerodynamic calculation, hydraulic calculation and strength calculation were made. The thesis also includes the drawing of designed waste heat steam boiler.
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