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Ideal cycles of internal combustion engines
Marušák, Ondřej ; Jedelský, Jan (referee) ; Štětina, Josef (advisor)
The thesis set out the basic thermodynamic circulation and their properties. For these orbits are shown ideal cycles gas engine and diesel engine, in which investigating thermal efficiency depending on the change in their characteristic parameters. The results are reported in tables and diagrams. For each of the engines is also a table with most values the compression ratio, the final compression pressure, the final compression temperature and maximum combustion pressure. Finally, we compare the thermal efficiency of the two orbits in the T-s diagrams.
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Combined heat and power generation
Hlaváč, Ivan ; Zálešák, Martin (referee) ; Klimeš, Lubomír (advisor)
The bachelor thesis deals with the power generation by means of a combined gas-steam cycle. In the first part of the work, an overview and description of the combined cycle as well as of the Brayton cycle and the Rankine cycle are provided. The second part of the work focuses in the thermal analysis of the cycles. As a part of the work, a computer program was created, which allows for such thermal analysis of the combined cycle.
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Uses of two-shaft combustion turbine for cases serial and parallel arrangement
Minář, Luděk ; Kracík, Petr (referee) ; Škorpík, Jiří (advisor)
Master thesis deals with analysis of characteristic points of two-shaft combustion turbine cycle for two different concepts of turbine’s arrangement. Computational model is compiled within the thesis for serial and parallel arrangement. Thermodynamic magnitudes of characteristic points of cycle are calculated with the computational model for designed operating point. Initial values of the computational model are chosen in consideration of reaching compromise between maximal thermal efficiency and maximal specific power.
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Influence of gas properties on the IC engine cycle
Ptáček, Martin ; Klimeš, Lubomír (referee) ; Štětina, Josef (advisor)
Properties of gases forming during combustion process in combustion engine influences the engine efficiency and fuel consumption. Harmful substances are formed during combustion, which could be reduced by combustion optimization. The thesis studies the change of gas properties inside combustion engine during temperature changes. The aim of this thesis is description and creation of models describing thermodynamic cycle of spark ignition engine. The First part of thesis explains basic ideal gas properties and principle of spark ignition engines. Second part deals with description of combustion process and substances, which enters and leaves the process. Created theoretical models are compared to each other during conclusion. Achieved results and created models can be used as foundation for creation of complex programs.
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Fuel for internal combustion engines
Vrbický, Jiří ; Jedelský, Jan (referee) ; Štětina, Josef (advisor)
This thesis is concerned with basic features of fuels for internal consumption engines, especially their influence on thermal efficiency. It also introduces dividing of fuels and their compare in ecologic, economic and technologic side. It is concerned convectional fuels (gasoline, diesel oil) and alternative fuels (nature gas, bottled gas, hydrogen, biodiesel, biogas, methanol and ethanol).
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Thermodynamic of Atkinson and Miller cycle
Böhm, Michael ; Mauder, Tomáš (referee) ; Štětina, Josef (advisor)
In the bachelor thesis is performed a basic thermodynamic analysis of combustion engines cycles. For every cycle there is also a design for a real combustion engine. Subsequently, the Atkinson and Miller cycles are compared to the ideal Otto cycle with supercharger and without it in terms of thermal efficiency for the same input parameters. The results are evaluated and the use of the Atkinson and Miller cycle in motor vehicles is explained. Next, there are specific car representatives, which use these cycles and the development trends of modern cars.
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Ideal cycles of internal combustion engines
Polívka, Radek ; Jaroš, Michal (referee) ; Štětina, Josef (advisor)
During the development of cars, two main basic types of internal combustion engines have been detached: diesel engines and petrol engines. The aim of the thesis is to make an analysis of ideal cycles of these engines (graphic scheme, derivation of valid formulas, characteristics quantities, etc.), with insist on the most important of parameters-thermal efficiency and then compare their advantages and disadvantages.
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Ideal cycle gas turbines
Bobčík, Marek ; Mauder, Tomáš (referee) ; Štětina, Josef (advisor)
The purpose of this bachelor thesis is to describe the basic characteristics of ideal cycle gas turbines. It deals with the derivation of basic formulae for thermal efficiency calculation. It then draws a comparison between the thermal efficiency of various types of heat cycles used for gas turbines.
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Prediction of fluids temperature profiles in heat exchanger
Havelková, Pavla ; Kilkovský, Bohuslav (referee) ; Jegla, Zdeněk (advisor)
This master’s thesis is focused on the description and processing of the cell method, which is generally recommended for prediction of fluids temperature profiles in heat exchanger. In the thesis the basic equations for calculating heat transfer are presented and is also described the current situation in the field of computational prediction of fluids temperature profiles in heat exchangers. The cell method is solved by using the software Maple and is applied to the specific case of industrial heat exchangers. The results obtained by the cell method are compared with the results obtained by educational version of software HTRI Xchanger Suite. By this comparison explicitness of the cell method is assessed.
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Ideal cycle turbocharged internal combustion engines
Hrubý, Jakub ; Jedelský, Jan (referee) ; Štětina, Josef (advisor)
The aim of this thesis is description of various charging methods as a one of the most attainable form of ramping up the power and fuel consumption efficiency of naturally aspirated engines nowadays. Main aspect is thermodynamic part of the whole problem, especially the comparison of thermal efficiencies between different cycles. After a short history brief, main reasons why is charging so important are answered. General description, work principles, advantages and disadvantages of new technologies are also included. Emphasis is aimed at topicality and graphic interpretation. Thesis is dealing with charging diesel engines, but also petrol engines in automotive industry and offering a possible way of future development.
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