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Analysis of factors influencing gas microturbine operation
Kostrhounová, Petra ; Máša, Vítězslav (referee) ; Konečná, Eva (advisor)
This bachelor thesis deals with the assessment of operating parameters of a gas microturbine. The first part covers the gas microturbine, its function and individual structural components. It also describes the possible use in combined heat and power generation and an overview of main manufacturers in the current market. The theoretical part of the work, based on a search of professional studies, summarizes selected factors influencing the efficiency of the gas microturbine, namely temperature and relative humidity, atmospheric pressure and parameters of various types of fuel. In the last part, the work focuses on the specific operation of the gas microturbine Capstone C30. Data from experimental measurements are analysed and the electrical efficiency is determined from them, which is compared with theoretical assumptions. Finally, the influence of the measured parameters on the electrical efficiency of the microturbine is discussed and the ideal course of the experiment is proposed.
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Influence of environmental conditions on the modulus of elasticity of concrete
Peřina, Tomáš ; Novosad, Petr (referee) ; Křížová, Klára (advisor)
Increasingly, the modulus of elasticity of concrete is at the forefront of interest. In the past, it has been neglected to some reason and not taken into due consideration. The theoretical part of the bachelor thesis is to study of factors influencing the static modulus of elasticity in compression. The practical part is focused on monitoring the modulus of elasticity of concrete, based on the different type of the environment stored test specimens. Concrete will be stored outdoor in the water and in the laboratory environment conditions. Designed concrete mixes will be primarily different with the used of type of admixtures but also with type of cement. The result values will be compared on the dependence of environmental conditions of the test specimens.
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Passivation of the active layer in perovskite solar cells with inverted architecture
Babincová, Kristina ; Zmeškal, Oldřich (referee) ; Pospíšil, Jan (advisor)
The topic of this work is the passivation of the active layer of perovskite solar cells with an inverted structure. The work is divided into theoretical and experimental part. The theoretical part describes in particular the passivation and modification of the perovskite layer as well as the characteristic properties of perovskite, including structure and stability. The experimental part deals with the preparation of photovoltaic cells with an inverted structure. For the characterization of photovoltaic cells, reference samples were prepared and their active layer was modified by plasma. The most used deposition technique for the preparation of layers was the spin coating method. From the performed experiments it can be concluded that the preparation of samples and their subsequent modification under laboratory conditions does not lead to the improvement of the final parameters of photovoltaic conversion. By transferring the sample preparation and passivation of the active layer to an inert atmosphere, it was possible to produce cells with higher efficiencies (compared to the reference sample), around 10 %. Another advantage of this plasma treatment of the active layer is that it also improves the stability of the prepared structures, which even after a few days in air show almost 80 % of the original efficiency.
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Passivation of the active layer in perovskite solar cells with inverted architecture
Babincová, Kristina ; Zmeškal, Oldřich (referee) ; Pospíšil, Jan (advisor)
The topic of this work is the passivation of the active layer of perovskite solar cells with an inverted structure. The work is divided into theoretical and experimental part. The theoretical part describes in particular the passivation and modification of the perovskite layer as well as the characteristic properties of perovskite, including structure and stability. The experimental part deals with the preparation of photovoltaic cells with an inverted structure. For the characterization of photovoltaic cells, reference samples were prepared and their active layer was modified by plasma. The most used deposition technique for the preparation of layers was the spin coating method. From the performed experiments it can be concluded that the preparation of samples and their subsequent modification under laboratory conditions does not lead to the improvement of the final parameters of photovoltaic conversion. By transferring the sample preparation and passivation of the active layer to an inert atmosphere, it was possible to produce cells with higher efficiencies (compared to the reference sample), around 10 %. Another advantage of this plasma treatment of the active layer is that it also improves the stability of the prepared structures, which even after a few days in air show almost 80 % of the original efficiency.
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Analysis of factors influencing gas microturbine operation
Kostrhounová, Petra ; Máša, Vítězslav (referee) ; Konečná, Eva (advisor)
This bachelor thesis deals with the assessment of operating parameters of a gas microturbine. The first part covers the gas microturbine, its function and individual structural components. It also describes the possible use in combined heat and power generation and an overview of main manufacturers in the current market. The theoretical part of the work, based on a search of professional studies, summarizes selected factors influencing the efficiency of the gas microturbine, namely temperature and relative humidity, atmospheric pressure and parameters of various types of fuel. In the last part, the work focuses on the specific operation of the gas microturbine Capstone C30. Data from experimental measurements are analysed and the electrical efficiency is determined from them, which is compared with theoretical assumptions. Finally, the influence of the measured parameters on the electrical efficiency of the microturbine is discussed and the ideal course of the experiment is proposed.
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Influence of environmental conditions on the modulus of elasticity of concrete
Peřina, Tomáš ; Novosad, Petr (referee) ; Křížová, Klára (advisor)
Increasingly, the modulus of elasticity of concrete is at the forefront of interest. In the past, it has been neglected to some reason and not taken into due consideration. The theoretical part of the bachelor thesis is to study of factors influencing the static modulus of elasticity in compression. The practical part is focused on monitoring the modulus of elasticity of concrete, based on the different type of the environment stored test specimens. Concrete will be stored outdoor in the water and in the laboratory environment conditions. Designed concrete mixes will be primarily different with the used of type of admixtures but also with type of cement. The result values will be compared on the dependence of environmental conditions of the test specimens.
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