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Thermal phenomena modeling of air electronic unit
Ančík, Zdeněk ; Toman, Jiří (referee) ; Vlach, Radek (advisor)
This thesis is focus on thermal analysis of aircraft electronic devices and their cooling possibilities. The two analytic methods of thermal analysis are applied on two particular technical objects. The laboratory experiment of non-contact temperature measurement method is applied on real unit. The results of simulation are compared with results of experiment.
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Application of thermal analysis in energetics
Skala, Šimon ; Šnajdárek, Ladislav (referee) ; Moskalík, Jiří (advisor)
This bachelor´s thesis deals with the thermal analysis. The first part contains general information about thermal analysis. The second part provides overview basic types of thermal analysis methods. In the third part there are described in detail two main thermal analysis methods. The last section is focused on realization and evaluation of thermogravimetric analysis of sample of a brown coal.
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Utilization of thermal analysis in study on protein denaturation
Bošeľová, Miriam ; Pekař, Miloslav (referee) ; Sedláček, Petr (advisor)
This bachelor thesis deals with the use of techniques of thermal analysis in the study of thermal denaturation of proteins. As a model protein was chosen lysozyme. In the experimental part were used two methods of thermal analysis – differential scanning calorimetry (DSC) and temperature modulated differential scanning calorimetry (TMDSC). One of the objectives of the study was to determine the utility of DSC and TMDSC in the study of lysozyme denaturation and to futher characterize the results we can obtain from the individual methods. Another goal was the optimization of TMDSC. During optimalization of TMDSC heat-iso, heat-only and heat-cool modes were compared in 60 seconds and 100 second periods. By selected methods was observed denaturation of lysozyme. Denaturation of lysozyme is predominantly created by reversible component of the heat flow and the denaturation temperature is in the range of 71,16 °C to 75,21 °C depending on the set parameters.
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Study on phase transitions in humic substances
Grebíková, Lucie ; Šmejkalová, Daniela (referee) ; Kučerík, Jiří (advisor)
The work is aimed to examine the potential applications of temperature modulated differential scanning calorimetry in study on phase transitions in humic acids. Experiments will deal with both humic standards and the solid rests after sequential extraction of specific molecular fractions to reveal their role in secondary structure of humic acids.
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Comprehensive structural analysis of compressor wheel using FEM
Chromek, Lukáš ; Nehybka, Jindřich (referee) ; Civín, Adam (advisor)
This thesis explores the utilization of FEM software ANSYS in the analysis of the real blade wheel of a radial compressor used in small turbine aviation motors. This apparatus is made by První brněnská strojírna a.s., and its detached site in Velká Bíteš where it has the aviation engineering division. The aim of this thesis is a comprehensive blade wheel analysis composed of several steps. These steps include static and elasto-plastic strength analysis, which describes stress distribution and its assessment from the perspective of boundary conditions of elasticity during the use of the Hooke and the non-linear model of the material. Another step is dynamic analysis; in this case modal analysis, which describes the frequencies and its waveforms. The last part of the thesis contains thermal analysis while considering stationary and non-stationary thermal field. The analysis is then transformed into thermal-stress coupled analysis, which describes stress distribution resulting from thermal expansion of the material. The thesis follows the process of calculation simulations that are used during the design of a real impeller, thus before the creation of a prototype that undergoes real experiments.
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Calculation of temperature fields in induction machines
Horálek, Lukáš ; Dostál, Lukáš (referee) ; Janda, Marcel (advisor)
The issue of this thesis deals with the thermals electrical machines. Specifically, the calculation of temperature fields using the finite element method and analytical calculation of one of the machines with a replacement thermal circuit. Using Autodesk Inventor create a 3D model of the real electric machine and then in the ANSYS Workbench perform thermal analysis using finite element method. Next, perform analytical calculation of one part of the machine, namely the stator, using a simplified thermal replacement scheme. Also, we realize the measurement of temperature on the specific machine under various operating conditions, the calculations and measurements between them compared.
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Calculation of the cooling of the asynchronous machine ANSYS CFX
Horálek, Lukáš ; Veselka, František (referee) ; Janda, Marcel (advisor)
The issue this master’s thesis discusses the cooling synchronous machines. Specifically, the calculation of cooling induction motor using the finite volume method. Using Autodesk Inventor will create a 3D model of a real electric machine, ie asynchronous motor and then ANSYS WORKBENCH perform system analysis CFX, based on the finite volume method. Furthermore, we realize the air speed measurements on a particular machine and the individual results obtained by measuring and calculating the actual compared with each other. The master’s thesis also deals marginally with closely related to it. For the same machine model, we apply the calculation of the temperature fields using the finite volume method and them perform a thermal analysis. Next, we can carry out the measurement of the temperature on the motor itself and calculate the measured values and the measured compare each other.
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Water retention capacity of humic substances
Cihlář, Zdeněk ; Šmejkalová, Daniela (referee) ; Kučerík, Jiří (advisor)
Humic acids were extracted from South Moravian lignit. That humic sample was oxidized by either H2O2 or HNO3. In next step, oxidized humic acids were polymerized by formaldehyde in order to obtain cross-linked structures with improved water retention capacity. Affinity to water and water retention capacity of obtained products were studied by thermal analysis (DSC – differential scanning calorimetry and TGA – thermogravimetric analysis). In order to study above-mentioned parameters two different methods were used. First approach represented sorption of water to humic acids from three controlled humidities, for description of those processes TGA measurement was used. Second study was based on the DSC monitoring of water excess sorption. Results obtained from TGA measurements showed an increasing sorption ability with increasing relative humidity of the environment. DSC measurerents in hermetically sealed containers resulted in an increasing content of water bound by humic acids structures. All the modified samples of humic acids (oxidized as well as oxidized and modified by formaldehyde) gave higher retention capacity in comparion with the parental humic sample.
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