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Heat transfer analysis of phase-change process in tubular exchanger
Fečer, Tomáš ; Bašta,, Jiří (referee) ; Kabele,, Karel (referee) ; Plášek, Josef (advisor)
The system HVAC is frequently based on cyclic phase change of boiling fluid. This phase change of boiling fluid (liquid-gas or gas-liquid) is coupled with boiling heat transfer by nucleate boiling, convective boiling and pre/post dryout effect. The nucleate boiling is depended on superheat of wall (i.e. heat flux) and presence of active nucleation sites. The two-phase convection boiling with dependence on mass flux and vapour quality is performed in liquid film between superheated wall and vapour core. The pre/post dryout effect is significant, when the liquid film is consumed and superheated wall is exposed directly to vapour core. This boiling heat transfer by nucleate boiling, convective boiling and pre/post dryout effect is simplified for engineering design on boiling heat transfer coefficient. Therefore, the dissertation thesis is aimed at experimental analysis of phase-change process in advanced engineering design.
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gasification of biomass with a mixture of oxygen and water vapor
Chlubna, Martin ; Lisý, Martin (referee) ; Baláš, Marek (advisor)
The aim of this diploma thesis is to describe the gasification of biomass with a mixture of oxygen and water vapor. The theoretical part is focused on the gasification process, gasification reactors and the quality of the resulting gas. In the experimental part we look for the ideal ratio of oxygen to water vapor, which are used as gasification media. Subsequent measurements are carried out on the fluidized bed reactor, the results of which are further processed and evaluated.
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Super-heated steam cycles
Uherek, Jan ; Kracík, Petr (referee) ; Pospíšil, Jiří (advisor)
The purpose of this bachelor´s thesis is to present new, highly efficient thermal cycles used in power plants, and to compare them with classical cycles. First, the impact of these cycles on the efficiency of electricity production is examined. The following section describes power plants where the supercritical technology has been successfully installed. The last section explains the calculation of the heat transfer surface. The conclusion of this thesis attempts to outline the future of energetics from the author´s point of view.
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Heat transfer analysis of phase-change process in tubular exchanger
Fečer, Tomáš ; Bašta,, Jiří (referee) ; Kabele,, Karel (referee) ; Plášek, Josef (advisor)
The system HVAC is frequently based on cyclic phase change of boiling fluid. This phase change of boiling fluid (liquid-gas or gas-liquid) is coupled with boiling heat transfer by nucleate boiling, convective boiling and pre/post dryout effect. The nucleate boiling is depended on superheat of wall (i.e. heat flux) and presence of active nucleation sites. The two-phase convection boiling with dependence on mass flux and vapour quality is performed in liquid film between superheated wall and vapour core. The pre/post dryout effect is significant, when the liquid film is consumed and superheated wall is exposed directly to vapour core. This boiling heat transfer by nucleate boiling, convective boiling and pre/post dryout effect is simplified for engineering design on boiling heat transfer coefficient. Therefore, the dissertation thesis is aimed at experimental analysis of phase-change process in advanced engineering design.
|
|
|
gasification of biomass with a mixture of oxygen and water vapor
Chlubna, Martin ; Lisý, Martin (referee) ; Baláš, Marek (advisor)
The aim of this diploma thesis is to describe the gasification of biomass with a mixture of oxygen and water vapor. The theoretical part is focused on the gasification process, gasification reactors and the quality of the resulting gas. In the experimental part we look for the ideal ratio of oxygen to water vapor, which are used as gasification media. Subsequent measurements are carried out on the fluidized bed reactor, the results of which are further processed and evaluated.
|
|
|
Super-heated steam cycles
Uherek, Jan ; Kracík, Petr (referee) ; Pospíšil, Jiří (advisor)
The purpose of this bachelor´s thesis is to present new, highly efficient thermal cycles used in power plants, and to compare them with classical cycles. First, the impact of these cycles on the efficiency of electricity production is examined. The following section describes power plants where the supercritical technology has been successfully installed. The last section explains the calculation of the heat transfer surface. The conclusion of this thesis attempts to outline the future of energetics from the author´s point of view.
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