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Simulation of steady-state and dynamic behavior of low-temperature fuel cell
Smugala, Ondrej ; Radil, Lukáš (referee) ; Ptáček, Michal (advisor)
This bachelor´s thesis is concerned with mathematic modelling of low temperature proton exchange membrane fuel cell (PEMFC). First part of the thesis is focused on explaining the principle of production of electricity by this type of source. The main advantages and disadvantages of this technology are presented there. A division of fuel cells according to the stack temperature and the kind of used electrolyte is also made in this part. Typical technical information is mentioned for every type of fuel cell. The rest of thesis is concerned with the PEMFC. Firstly there is a description of construction of fuel cell and a presentation of applications in the industry. The second part of work includes a mathematical description of steady and dynamic behavior of fuel cell which is based on relations among fundamental parameters and quantities. The other part contains all results of simulation which was made on a model created in Matlab Simulink. Comparison of the results of real measurement with the results of simulation which was performed on a modified model is provided in the last part of thesis.
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Design of optical microtribometer
Poláček, Tomáš ; Zapletal, Tomáš (referee) ; Šperka, Petr (advisor)
The aim of this work is to design an optical microtribometer with the possibility of dynamic measurement of liquid friction in simulated point contact. The device should be designed to allow a microscope to observe the point contact. The work describes the construction of selected devices investigating forces in contacts. Their advantages and disadvantages when used in the given problematics are pointed out. Touch parameters were determined using formulas of Hertz stress. Subsequently, the design of the cantilever on which the ball (one of the contact surfaces) is to be attached has been discussed. Using the cantilever and capacitive position sensors, forces and dynamic contact behavior are subsequently measured. The micrometer head and the designed six-joint mechanism are used to draw the necessary load. The required movement of contact is created by the rotation of the disk provided by the synchronous belt transmission and the synchronous engine. At the end of the work, the dynamic behavior of the device is evaluated, with the frequencies at which the measurement results can be influenced. The parameters of the proposed microtribometer are compared with the parameters of the devices described in the research section.
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Design of optical microtribometer
Poláček, Tomáš ; Zapletal, Tomáš (referee) ; Šperka, Petr (advisor)
The aim of this work is to design an optical microtribometer with the possibility of dynamic measurement of liquid friction in simulated point contact. The device should be designed to allow a microscope to observe the point contact. The work describes the construction of selected devices investigating forces in contacts. Their advantages and disadvantages when used in the given problematics are pointed out. Touch parameters were determined using formulas of Hertz stress. Subsequently, the design of the cantilever on which the ball (one of the contact surfaces) is to be attached has been discussed. Using the cantilever and capacitive position sensors, forces and dynamic contact behavior are subsequently measured. The micrometer head and the designed six-joint mechanism are used to draw the necessary load. The required movement of contact is created by the rotation of the disk provided by the synchronous belt transmission and the synchronous engine. At the end of the work, the dynamic behavior of the device is evaluated, with the frequencies at which the measurement results can be influenced. The parameters of the proposed microtribometer are compared with the parameters of the devices described in the research section.
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Simulation of steady-state and dynamic behavior of low-temperature fuel cell
Smugala, Ondrej ; Radil, Lukáš (referee) ; Ptáček, Michal (advisor)
This bachelor´s thesis is concerned with mathematic modelling of low temperature proton exchange membrane fuel cell (PEMFC). First part of the thesis is focused on explaining the principle of production of electricity by this type of source. The main advantages and disadvantages of this technology are presented there. A division of fuel cells according to the stack temperature and the kind of used electrolyte is also made in this part. Typical technical information is mentioned for every type of fuel cell. The rest of thesis is concerned with the PEMFC. Firstly there is a description of construction of fuel cell and a presentation of applications in the industry. The second part of work includes a mathematical description of steady and dynamic behavior of fuel cell which is based on relations among fundamental parameters and quantities. The other part contains all results of simulation which was made on a model created in Matlab Simulink. Comparison of the results of real measurement with the results of simulation which was performed on a modified model is provided in the last part of thesis.
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Dynamic Control of Hydrogenation Process in Trickle Bed Reactor
Hanika, Jiří
Periodic modulation of trickle bed reactor control parameters represents a new approach to the technology which enables higher reactor throughput and more safe operation of trickle bed reactor for exothermal reaction. Knowledge can be utilized for intensification of hydrogenation processes, e.g. hydrorefining of pyrolysis gasoline.
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