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The public on the transition to cleaner energy - autumn 2022
Červenka, Jan ; Ďurďovič, Martin
In the period from the first half of September to the beginning of November 2022, a block of questions devoted to energy issues was included in the regular research of Our Society. Part of the questions focused on the transition of the energy industry to cleaner, more environmentally friendly energy sources in the production of heat and electricity. The survey specifically investigated how citizens evaluate the frugality of various energy sources in terms of the impact of their use on the environment, how they perceive the success or failure of the transition to cleaner sources in the Czech Republic, whether, in their opinion, the state should support the use of renewable energy sources, how it is important for them, whether the electricity they consume in their household comes from renewable sources, and whether they use or plan to use renewable sources for the production of heat or electricity, either in a community, such as multiple households within an apartment building, municipality or part of it , or independently in your own household.\nPeople perceive solar radiation, water currents and wind blowing as the most environmentally friendly sources of electricity production, while burning coal is considered the least environmentally friendly.\n36% of Czech citizens consider the transition to cleaner energy successful, 44% consider it unsuccessful.\nA large majority (93%) of the Czech public is inclined to the opinion that the state should support the use of renewable energy sources, but only two fifths (41%) attach importance to whether the electricity in their household is from renewable sources.\nWithin a certain community, 4% of citizens use renewable sources for heat production, and 4% use them individually in their household for heat production. Another 5% plan it as part of a community and 8% plan it individually in their household.\n6% of citizens use electricity from renewable sources as part of a community, and 6% use it individually in their household, 8% and 11% of others have plans to do so.\nOverall, about three-fifths of respondents (59%) said that neither in the community nor individually do they use and do not plan to use renewable sources to generate electricity or heat.
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Modelling of a heat water exchanger and its regulation
Černík, Michal ; Kaczmarczyk, Václav (referee) ; Mihálik, Ondrej (advisor)
The thesis deals with the modelling of a hot water heat exchanger station and its control. It includes project documentation, with theoretical and practical part. The theoretical part is dealing with theoretical knowledge about every used element that is used in the design. The practical part deals with the implementation of the electrical wiring of the station, its connection with the control automaton, design of the mathematical model, simulation and design of the controller.
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Analysis of Heating Systems for Family House
Holubka, Oleksandr ; Elbl, Patrik (referee) ; Lisý, Martin (advisor)
The aim of this bachelor’s thesis is the assessment of options and innovations when it comes to heating of family houses. These options are then compared. In the last part of this thesis, the gathered insight is used for a technical and economical evaluation and subsequent proposal of a heating system of the model house.
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Advanced Stochastic Programming Models in Power Engineering
Pavelka, Ondřej ; Štětina, Josef (referee) ; Popela, Pavel (advisor)
This diploma thesis applies stochastic optimization in the field of the power engineering. In the thesis first part, the needed mathematical theory is described, specifically mathematical, linear, nonlinear, integer and stochastic programming. The second part deals with the heating plant, in which heat is generated by gas and biomass boilers. The aim of this thesis is to design a model for the schedule planning of these boilers. The model is based on two stage stochastic programming with scenario approach. Then the model is solved by GAMS software. In the final part of the text, the focus is on the model sensitivity analysis and suggestions for future improvement.
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Analyses of the Compressed Air Energy Storage proces in Ansys Fluent system
Hájková, Věra ; Šabacká, Pavla (referee) ; Maxa, Jiří (advisor)
This bachelor thesis discusses different types of energy storage in the introduction. It describes the different technologies, their functions, advantages and disadvantages. It compares them on the basis of the ESOI ratio, which is the ratio of energy stored on invested. The main type of energy storage covered in the term paper is compressed air energy storage. The thesis describes the principle of a method of energy storage as well the companies and projects that are working on or using this technology. Furthermore, the issue of heat energy loss during air compression is outlined, which leads to a significant reduction in efficiency. The last part of the thesis is a practical part, which uses a model example to show the temperature and pressure evolution during the pumping of air into the storage tank.
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Modelling of a heat water exchanger and its regulation
Černík, Michal ; Kaczmarczyk, Václav (referee) ; Mihálik, Ondrej (advisor)
The thesis deals with the modelling of a hot water heat exchanger station and its control. It includes project documentation, with theoretical and practical part. The theoretical part is dealing with theoretical knowledge about every used element that is used in the design. The practical part deals with the implementation of the electrical wiring of the station, its connection with the control automaton, design of the mathematical model, simulation and design of the controller.
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Cooling systems of battery vehicle
Šimáček, Daniel ; Hvožďa, Jiří (referee) ; Bartuli, Erik (advisor)
This bachelor thesis deals with the issue of cooling systems for electric vehicles. The first part is devoted to the theoretical description of the components producing the largest part of the heat - the battery and the electric motor. Heat transfer theory is also mentioned to better relate the cooling issues. The second part focuses on the description of the current cooling approaches for the electric vehicle components - battery and electric motor. The section on electric motor cooling includes a comparison of cooling approaches with the internal combustion engine. Alternative cooling methods are described in next section.
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Students preconceptions about heat and temperature
Čečák, Michal ; Mandíková, Dana (advisor) ; Kácovský, Petr (referee)
This thesis deals with the preconceptions and misconceptions of students in the field of heat and temperature. Here is an overview of textbooks for elementary and secondary schools with topics concerning heat and temperature. This thesis contains a brief characteristic of notions preconceptions and misconceptions, characteristic of Active Learning methods and characteristic of Interactive Lecture Demonstrations. This thesis also contains research of Students preconceptions and misconceptions about heat and temperature (mainly students of grammar schools). For this research was used HTCE test. Results of the research are processed for all students and for students of each class. There are three worksheets (translated from English), which should help with removing misconceptions.
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Rozložení tepelných toků na stěnu tokamaku způsobených okrajovými nestabilitami
Kripner, Lukáš ; Cahyna, Pavel (advisor) ; Urban, Jakub (referee)
Edge localized modes (ELMs) are a concern for future magnetic fusion devices, such as ITER, due to the large transient heat loads they generate on the plasma facing components. A very promising method of ELM suppression is an application of resonant magnetic perturbations (RMP); however, such application leads to localized places of higher heat fluxes called footprints. Both ELMs and RMP could limit the operational lifetime of the device. In this thesis, we analyze the temporal and spatial distribution of footprints using the tangle distance method in the aim to prevent a transient overheating. We also analyze quasi-double-null configuration of the ITER plasma which can be expected to be the most susceptible to overheating of the upper wall. Based on the modelling, the potentially dangerous configurations of the RMP have been shown. Using the ELM filament model included in the LOCUST GPU code, we study temporal and spatial distribution of the heat fluxes caused by ELMs in the axially symmetric and the asymmetric magnetic field. The results are compared with published experimental observations. Powered by TCPDF (www.tcpdf.org)
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