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Modification properties of MnOx based positive electrode for AFC
Kamrla, David ; Bača, Petr (referee) ; Novák, Vítězslav (advisor)
The subject of this graduation thesis is low-cost alkaline power cells and especially electrodes with alternative catalyst made of MnOx + dopant. The thesis expands the bachelor´s thesis [1] and previous research [4] [12] [13] [14]. Volt-ampere characteristics and power characteristics of the katodes for AFC, subsidized with various dopants, are the outcome of this project. The project presents the optimalisation of preparation process of AFC electrodes. The aim is to prepair several electrodes with identical construction, which varies only with the type of the dopant.
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Influence of temperature on lead acid batteries lifetime
Kopečný, Martin ; Bača, Petr (referee) ; Neoral, Jiří (advisor)
Lead –acid batteries are the most common type of secondary cells used in automotive industry. This diploma thesis deals with the influence of temperature on their lifetime. In the preamble of this work is shortly described their history, division, construction and processes during battery operation. There are noted unfavorable phenomena which have an impact on increasing the temperature inside the battery. The first experimental part is devoted to evaluation the effects of addition on the temperature rise during charging. The second part is focused on conditions simulation in hot areas at the temperature above 30 °C and effects of this temperature on the function of lead – acid batteries.
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Carbon materials for power sources
Tichý, Jiří ; Bača, Petr (referee) ; Novák, Vítězslav (advisor)
This work deals with carbon materials and using them in electrochemical energy sources. Object of this work was to prepare carbon materials and investigate their electrical properties. The theoretical part objects of the carbon materials, their properties, application in electrochemical energy sources and measurement methods used in experimental part. Experimental part describes the preparation of the electrodes with various carbon materials and summarizes the results of measurements.
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Using lead-acid accumulators in hybrid electric vehicle regime
Hejdiš, Roman ; Novák, Vítězslav (referee) ; Bača, Petr (advisor)
The master´s thesis discuss characteristics of hybrid electric vehicles and lead-acid accumulators applied in car industry. It compares classic and alternative drive in cars, descibes classification of hybrid drives and its characteristics. Further work disscus lead-acid accumulators which focuses on VRLA accumulators applied in hybrid electric cars. Practical part contains a construction description of negative electrode and experiment, which studied influence of various amount addition of carbon on attributes of these electrodes.
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Health effects of ionizing and non-ionizing radiation
Gottvald, Martin ; Neoral, Jiří (referee) ; Bača, Petr (advisor)
This diploma thesis deals with electromagnetic radiation in its frequency spectrum. It also divides radiation into ionizing and non-ionizing. The principle of its effects and possible health problems from radiation exposure are also described. Hygienic limits – the maximum allowable and reference values of non-ionizing radiation are analysed too. The thesis should prove that the things of everyday need do not threaten the lives of human beings and are in compliance with the regulation No. 1/2008 Sb. on Health Protection Against Non-Ionizing Radiation. Measurement of low-frequency part is carried out with the cooperation of The National Institute of Public Health. Measurement of high-frequency part was carried out in 3 flats. The aim of this measurement was to find out the change of power density with the moving in a flat and the influence of the barriers (in this case walls).
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Photovoltaic system for RAPS applications
Nevoral, Miroslav ; Bača, Petr (referee) ; Křivík, Petr (advisor)
The beginning of this work presents the basic principles of photovoltaic cells, their advantages and disadvantages. There is also an overview of photovoltaic systems. The next part takes a closer look on lead-acid accumulators followed by a practical part regarding the measurement of VA characteristics. The main goal of this work is to assemble an experimental PV system. It will consist of a PV module, an accumulator (consisting of two cells connected in series and producing an overall voltage of 5V) and of a variable load (assembled from nineteen resistors with resistance varying from tens to hundreds of Ohms). This system is connected to a computer that runs the control software which was created using the VEEPro 8.0 simulation environment. The measurements can be taken in two ways. Either the operator can select the load resistor combinations manually, or the operator only launches the measurement and the load is selected automatically by the software. This way we obtain an automatized workplace for measuring VA characteristics of photovoltaic panels.
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Economics and viability of photovoltaic power station
Mrázek, Dalibor ; Bača, Petr (referee) ; Křivík, Petr (advisor)
At the beginning of the submitted work, I dealt with the study of various types of photovoltaic panels, their diverse use, effectiveness, advantages of each type and description of climate in the Czech Republic. Depending on the number of sunny days and no claudy days, I was looking for the best areas photovoltaic power. On the basis of cooperation with the firm and Energ-servis and using their test center, I compare different types of panels, their performance in relation with the cost and method of purchase. From these data, six diverse installation, I tried to determine the best type of panel that is best for the South Moravian region in the cost / return on investment.
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Functional blocks for the development of autonomous photovoltaic system
Ovesný, Karel ; Křivík, Petr (referee) ; Bača, Petr (advisor)
The project considers realization system, which will allow us to test six different operation modes on lifetime accumulators. The system will link to computer, which will execute measurement current and tension and switch betwencharging and discharging modes. The measured values will record in someone time intervals in to computer memory. After someone time will analise these measured valuer and will provide optional operation mode.
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Catalysts for positive electrode of hydrogen-oxygen fuel cell
Kováč, Martin ; Bača, Petr (referee) ; Novák, Vítězslav (advisor)
Master's thesis deals with new methods of preparing catalytic materials for positive electrode of an oxygen-hydrogen fuel cell and the influence of potassium permanganate or doping agent molar mass change on theirs attributes. Further it studies the use of proper measuring methods designed to qualify theirs attributes and the presentation of achieved results. In particular methods of linear sweep and cyclic voltammetry and the processing of data using Koutecky-Levich and Tafel plot and wave log analysis. Values of half-wave and onset potential and kinetic coefficient have been measured and calculated.
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