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Hydrogen pressure reduction before injection into the power unit
Švestka, Jiří ; Zeizinger, Lukáš (referee) ; Štětina, Josef (advisor)
This bachelor thesis's central argument revolves around the depressurisation of hydrogen and the pressure regulator required to do so. It explores the journey of hydrogen from its production through distribution to the ways of multiple applications. Specific emphasis is placed on the characteristic properties of hydrogen that need to be taken into account during the design of the reduction valve itself. In this thesis, the design of a high-pressure pressure regulator optimized for piece production is presented, together with an analysis of the dynamics of hydrogen as it passes through the valve.
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Study of the ecological impact of production, operation and disposal of various types of cars
Kutnar, Václav ; Jandová, Kristýna (referee) ; Jaššo, Kamil (advisor)
To reduce greenhouse gas emissions, countries have focused on (among other things) automobile transport. However, there are different car powertrains, and each produces a different amount of emissions from different parts of their lifecycles, which also vary from state to state. Knowing exact, comparable values is necessary for deciding how to reduce these emissions most efficiently and economically possible. Existing studies often focus on only one part of the life cycle and/or are not localized to a particular state. This study analyses the entire life cycle of a vehicle and its fuel or energy for a vehicle manufactured, operated, and recycled in the Czech Republic. It draws on existing studies, supplemented by data from state agencies, vehicle manufacturers, and our calculations. It was found that in the Czech Republic, compared to a vehicle with a petrol internal combustion engine (ICEVg), an electric vehicle (BEV) has 33% lower total GHG emissions, and a vehicle with hydrogen fuel cells (FCEV) 19% lower. However, an internal combustion engine vehicle has lower emissions from its production and as a result, its cumulative emissions are lower than an electric vehicle until 70,000 km driven and a hydrogen fuel cell vehicle until 111,000 km
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Design of transit bus
Semerák, Jan ; Pelikán, František (referee) ; Zvonek, Miroslav (advisor)
The diplom work is focused on the design of transit bus. I pointed out two aim: design from the view of future the perspektive; environmental drive and create timeless bus design, which should be correspond with the drive of near future. It was chosen the most ecological drive with help of hydrogen and fuel cells. This drive was developed in detail. Like reserve and helpful energy source was used ultrakapacitors and fotovoltaic cells. Bus design tries to realize the future requirement of carriers and regarding to its oscillating along big cities so represent with its design the used drived unit. The internal ordering of interior tries to realize the together and future reguirements on the sit ergonomics, store of bagages, hygienic requirements and good lookout of passengers. The name and logo of transit bus arrise from reference to fuell, environment and fuell cell.
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BMW Up-to-date SI-engines
Šroba, Roman ; Prokop, Aleš (referee) ; Dundálek, Radim (advisor)
The Bachelor’s thesis deals with modern BMW spark-ignition engines. It provides an overview of current automotive design solutions in gasoline engines. The work is focused on three main areas. The first part describes the latest and unconventional technologies used in current BMW spark-ignition engines. The second part is focused on design solutions in specific aggregates, their evaluation or comparison with contemporary competition. The last part describes the hybrid vehicles and the car manufacturer's response to emission standards with focus on the waste heat of a car.
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Modelling of Air Supply by Compressor for Fuel Cell
Tkach, Svitlana ; Kudláček, Petr (referee) ; Novotný, Pavel (advisor)
The growing demand for freight transport and the long-term trend towards low-emission on-road trucks are driving a lot of attention towards fuel cell technology. Nowadays, computer simulations can be used to analyse complex fuel cell processes, which facilitates the time and cost of development. In this thesis, a computational model of a fuel cell system with a focus on air supply analysis is presented. An improvement in the performance characteristics of the air supply system, and therefore the fuel cell, can be achieved by using a compressor. Based on the initial design, an analysis of the influence of the compressor parameters at the design point on its power input is performed. An increase in compressor speed and isentropic efficiency at the design point led to a decrease in the required power input, while an increase in the pressure ratio at the design point led to an increase. As the result of the diploma thesis, an efficient tool for achieving optimal parameters of the fuel cell air supply system while minimizing the compressor input power is presented.
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Hydrogen as fuel for vehicles over 3.5 t
Alinče, Antonín ; Šebela, Kamil (referee) ; Štětina, Josef (advisor)
This bachelor thesis deals with hydrogen infrastructure for the needs of freight transport: methods of production, transportation, and storage of hydrogen. The work describes the path of hydrogen from production to vehicle propulsion, whether in the internal combustion engine or in the fuel cell. These hydrogen propulsion options are then compared with each other and with other fuels. The conclusion of the work is then focused on the conceptual design of the location of hydrogen tanks in the vehicle.
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Hydrogen Combustion in Reciprocatin Piston Engines
Forbelský, Antonín ; Svída, David (referee) ; Dundálek, Radim (advisor)
In the thesis I focused on the summary of the facts available concerning hydrogen combustion engines. The work gives a brief history of hydrogen engines. The main part consists of a description of the specifics of the conversion of conventional internal combustion engine into hydrogen engine, and a brief overview of vehicles powered by hydrogen internal combustion engine. In conclusion, the work includes consideration of the future of this technology.
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Koncepce pohonů osobních automobilů
Pospíšil, Jan
This work is focused on the conception of the drives cars. You will become acquainted with the various concepts pioneered in the field of passenger cars, with the advantages and disadvantages of each approach and the current situation. Further mention of the development of concepts for passenger cars and where it will go in the future. In addition, there will be described and technical solutions specific vehicle. First of all, familiarize yourself with the concepts that are 4, but each is unique. In the historical part I will focus on the pioneers and interestingly designed cars. Development of the concept of drives already a few years point to the use of alternative fuels and hybrid technology.
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Modelling of Air Supply by Compressor for Fuel Cell
Tkach, Svitlana ; Kudláček, Petr (referee) ; Novotný, Pavel (advisor)
The growing demand for freight transport and the long-term trend towards low-emission on-road trucks are driving a lot of attention towards fuel cell technology. Nowadays, computer simulations can be used to analyse complex fuel cell processes, which facilitates the time and cost of development. In this thesis, a computational model of a fuel cell system with a focus on air supply analysis is presented. An improvement in the performance characteristics of the air supply system, and therefore the fuel cell, can be achieved by using a compressor. Based on the initial design, an analysis of the influence of the compressor parameters at the design point on its power input is performed. An increase in compressor speed and isentropic efficiency at the design point led to a decrease in the required power input, while an increase in the pressure ratio at the design point led to an increase. As the result of the diploma thesis, an efficient tool for achieving optimal parameters of the fuel cell air supply system while minimizing the compressor input power is presented.
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Hydrogen as fuel for vehicles over 3.5 t
Alinče, Antonín ; Šebela, Kamil (referee) ; Štětina, Josef (advisor)
This bachelor thesis deals with hydrogen infrastructure for the needs of freight transport: methods of production, transportation, and storage of hydrogen. The work describes the path of hydrogen from production to vehicle propulsion, whether in the internal combustion engine or in the fuel cell. These hydrogen propulsion options are then compared with each other and with other fuels. The conclusion of the work is then focused on the conceptual design of the location of hydrogen tanks in the vehicle.
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