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Pyroelectric conversion and pyroelectric generators
Kaše, Jakub ; Pospíšil, Jiří (referee) ; Brázdil, Marian (advisor)
Presented bachelor thesis deals with pyroelectric conversion and pyroelectric generator applications. The principle of pyroelectric phenomenon and its origin in materials are described and known materials exhibiting significant pyroelectric properties are compared. Furthermore, pyroelectric generator constructions are presented and compared, an overview of implemented pyroelectric devices is created and possible future applications of pyroelectric generators are described. Following this, a comparison of pyroelectric conversion to alternative conversion methods is made and pyroelectric generators’ potential is evaluated with special focus on waste heat utilization. Current pyroelectric devices are able to reach thermal to electric conversion efficiency of 1,3 % or power density of 120 W/m2 while powered by a heat source with maximum temperature of 250 °C or lower. With regard to these results, this technology is potentially useable and further development and applications can be predicted in the future.
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Hydrogen filling station
Kaše, Jakub ; Šnajdárek, Ladislav (referee) ; Pospíšil, Jiří (advisor)
Presented master’s thesis deals with hydrogen filling stations, their concepts, design, and operation. The importance of hydrogen as an energy carrier, its properties, and the implications of these properties for the selection of materials suitable for hydrogen applications are described. In order to understand the decisions made in the design of the station, the hydrogen life cycle from production through transportation and storage to use is presented. This is followed by an evaluation of the cycle in terms of economics and environmental impact. The review part of the paper concludes with an introduction to fuel cell vehicles, which includes an overview of the selected passenger and commercial vehicles, and a description of hydrogen filling stations. The filling stations are discussed in terms of concepts and components, and an overview and analysis of selected implementations is also included. The computational part of the thesis focuses on the design and technoeconomic analysis of a hydrogen filling station with a daily capacity of approximately 50 kg/day and an hourly capacity of 6 vehicles/hour for the needs of the logistics company Zásilkovna s.r.o. A station variant with hydrogen gas delivery in pressure vessels was chosen. Three possible designs of the station were compared. The hydrogen filling station can be designed for the specified parameters without any problems. However, the analysis of the results showed a very strong dependence of the acquisition and operating costs on the nominal compressor power. Therefore, the design of the hydrogen filling station requires further optimization, which limits the direct applicability of the presented results.
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Pyroelectric conversion and pyroelectric generators
Kaše, Jakub ; Pospíšil, Jiří (referee) ; Brázdil, Marian (advisor)
Presented bachelor thesis deals with pyroelectric conversion and pyroelectric generator applications. The principle of pyroelectric phenomenon and its origin in materials are described and known materials exhibiting significant pyroelectric properties are compared. Furthermore, pyroelectric generator constructions are presented and compared, an overview of implemented pyroelectric devices is created and possible future applications of pyroelectric generators are described. Following this, a comparison of pyroelectric conversion to alternative conversion methods is made and pyroelectric generators’ potential is evaluated with special focus on waste heat utilization. Current pyroelectric devices are able to reach thermal to electric conversion efficiency of 1,3 % or power density of 120 W/m2 while powered by a heat source with maximum temperature of 250 °C or lower. With regard to these results, this technology is potentially useable and further development and applications can be predicted in the future.
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