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Analysis of thermal processes inside of lead acid battery cell in oxygen cycle regime
Vondrák, Michal ; Bača, Petr (referee) ; Křivík, Petr (advisor)
The aim of this thesis is the analysis of thermal processes in lead accumulators with oxygen cycle. The work is explaining the structure and principle of operation of the standard lead-acid battery and lead-acid battery with oxygen cycle. Generally are described thermal action inside a lead battery with oxygen cycle and the different types of heat generated during operation of the battery are discussed in detail. One chapter describes the practical experiments and their results.
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Investigation of temperature change in lead-acid accumulator for HEV
Tošer, Pavel ; Křivík, Petr (referee) ; Bača, Petr (advisor)
The oldest and also most used type of secondary cells is lead-acid accumulator. Basic functional principle stayed same as in foundation time, only operation parameters are still improving (for example one of the most important is lifetime). Significant technical problem is temperature of lead-acid battery and her influence on functionality and running reactions. Master thesis is focused on this section, when is necessary to evaluate new pieces of knowledge in development. The work deals with description existing types of accumulators, further deals with theory of temperature balance and in the end by measured datas and theirs analyzing.
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Examination of temperature changes in lead-acid battery system
Starý, Viktor ; Křivík, Petr (referee) ; Bača, Petr (advisor)
In the automobile industry is always more often talking about hybrid electric vehicles at the present. Functioning of these hybrid automobiles is provided by source of energy. This source is represented by accumulator. When accumulator is working we can see temperature changes. This project is dealing with used types of accumulators for hybrid electric vehicles. In the second phase is dealing with enquiring of temperature changes during different modes of operating.
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Thermoelectric properties of alkali activated aluminosilicates
Filipská, Kristýna ; Fiala,, Lukáš (referee) ; Zmeškal, Oldřich (advisor)
This work focuses on the potential usage of alkali-activated aluminosilicates (AAA) in relation to energy harvesting. It sets a goal of familiarizing the reader with thermoelectrical conversion itself and its existence within those materials. Based on this knowledge, the measurement of thermoelectrical voltage has been conducted in chosen mixtures of AAA; more specifically a slag geopolymer with carbon black admixture, a slag geopolymer with graphite powder admixture and a metashale geopolymer with graphite powder admixture. This experiment was executed by repeated heating of the surface area of the sample on one side using a resistor, while the other side was kept at reference temperature. The response in the form of voltage generated in the sample as well as on the electrodes was recorded. The measured values were then used to calculate the Seebeck coefficient. The best response was provided by a slag geopolymer sample with carbon black admixture at 4 % concentration (|| = 1904 V/K). The second goal was to measure thermal properties of those samples, specifically the specific heat capacity, the thermal conductivity coefficient and thermal diffusivity. This goal has been reached by capturing the samples with a thermal camera while heating them on a hot-plate. The highest values of specific heat capacity and the thermal conductivity coefficient were provided by a sample of metashale geopolymer with graphite powder admixture at 8 % concentration (c = 2086 J/kg/K; = 1,815 W/m/K). Thermal diffusivity proved to be almost identical in all samples, 610-7 m2/s on average. Based on the results, we conclude that the thermoelectrical conversion in these materials is not enough to be significant in bigger scale energy harvesting yet. However, we also believe that it’s possible to reach better results with further research.
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Examination of temperature changes in lead-acid battery system
Starý, Viktor ; Křivík, Petr (referee) ; Bača, Petr (advisor)
In the automobile industry is always more often talking about hybrid electric vehicles at the present. Functioning of these hybrid automobiles is provided by source of energy. This source is represented by accumulator. When accumulator is working we can see temperature changes. This project is dealing with used types of accumulators for hybrid electric vehicles. In the second phase is dealing with enquiring of temperature changes during different modes of operating.
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|
|
Analysis of thermal processes inside of lead acid battery cell in oxygen cycle regime
Vondrák, Michal ; Bača, Petr (referee) ; Křivík, Petr (advisor)
The aim of this thesis is the analysis of thermal processes in lead accumulators with oxygen cycle. The work is explaining the structure and principle of operation of the standard lead-acid battery and lead-acid battery with oxygen cycle. Generally are described thermal action inside a lead battery with oxygen cycle and the different types of heat generated during operation of the battery are discussed in detail. One chapter describes the practical experiments and their results.
|
|
|
Investigation of temperature change in lead-acid accumulator for HEV
Tošer, Pavel ; Křivík, Petr (referee) ; Bača, Petr (advisor)
The oldest and also most used type of secondary cells is lead-acid accumulator. Basic functional principle stayed same as in foundation time, only operation parameters are still improving (for example one of the most important is lifetime). Significant technical problem is temperature of lead-acid battery and her influence on functionality and running reactions. Master thesis is focused on this section, when is necessary to evaluate new pieces of knowledge in development. The work deals with description existing types of accumulators, further deals with theory of temperature balance and in the end by measured datas and theirs analyzing.
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