|
|
Impact of warming on soil organic carbon
Štecová, Michaela ; Vindušková, Olga (advisor) ; Jílková, Veronika (referee)
Climate change is the main cause of rising global temperatures around the world. Carbon sequestration in terrestrial ecosystems is considered one of the main tools for climate change mitigation, but current estimates of sequestration potential do not include the impacts of future climate change. The aim of this thesis is to summarize our current knowledge on the response of soil organic carbon to warming, alone as well as in combination with other drivers of climate change. A complementary aim is to compare the different methods used to study the impact of warming on soiIncreased temperature causes significant losses of soil carbon, but no consistent effect has been observed in combination with other aspects of climate change. Research suggests that carbon losses depend on the stability of soil fractions, with warming leading to greater decreases in particulate organic matter (POM). The combination of warming with rising CO2 concentration has led to an overall increase in soil carbon, although losses have been observed in combination with drought. When studying the effects of warming on soil carbon stocks, selecting the appropriate method is crucial. Active methods offer precise control but are more expensive and can impact soil biota, whereas passive methods are cheaper but require more time....
|
|
|
Steam-gas turbine for emission-free storage power plant
Schubert, Vojtěch ; Kracík, Petr (referee) ; Fiedler, Jan (advisor)
The thesis addresses energy storage in the context of the ongoing energy transformation and the climate crisis. Therefore, the CCUS technologies and the possibilities of electrical energy storage are presented in the form of a literature review. In relation to these issues, the thesis also presents the concept of an emission-free storage power plant, based on a patent from SE Brno. In the subsequent parts of the thesis, an instrumentation diagram is constructed, and a conceptual design of a gas-steam turbine for the energy unit of this storage power plant is proposed.
|
|
|
Design of the flow chart of Electro-Thermal Energy Storage unit with sCO2 circulation and calculation of its parameters
Suchomel, Josef ; Šnajdárek, Ladislav (referee) ; Škorpík, Jiří (advisor)
The most commonly used medium for most cycles is water. However, from an ecologi-cal point of view, carbon dioxide is a more suitable medium. Firstly, there will be less water consumption, and secondly, it is a monitored greenhouse gas whose quantity is required to be regulated. In this thesis, a heat plant is proposed, whose medium is CO2. Moreover, it is an electro-thermal energy storage unit, which could play an important role in the regulation of the energy system. The aim of the thesis is first to summarize the current knowledge of the given issue, and then to design a flow chart of the electro-thermal energy storage unit, including individual cycles and basic dimensions of turbomachinery.
|
|
|
Study of processes taking place during carbonation of ladle furnace slag
Sadílek, Lukáš ; Cába, Vladislav (referee) ; Másilko, Jiří (advisor)
This bachelor’s thesis is focused on the study of processes taking place during carbonation of ladle furnace slag (LFS). The main phases of the LFS, meaning -C2S, -C2S, C4AF, C12A7 and additionally -C2S were first synthesized in a pure form. Then all the samples, including the LFS, were studied for hydration and carbonation activity. The highest hydration activity was observed in the aluminate phases C4AF, C12A7 and the highest carbonation activity was exhibited mainly by -C2S then also -C2S and LFS. Main products forming during the carbonation are carbonates, meaning CaCO3 in various modifications but also a smaller amount of aluminate phase hydration products formed in a very quick reaction with mixing water. Both temperature and relative humidity have a significant influence on the carbonation process. These conditions affect the carbonation rate itself and relative humidity also changes the ratio of forming CaCO3 modifications, which is most likely due to the changes in the carbonation mechanism.
|
|
|
CO2 capture in a spray column using different atomization techniques
Klíma, Petr ; Bělka, Miloslav (referee) ; Malý, Milan (advisor)
Carbon dioxide capture (CO2) can be a key step in the fight against global climate change. One of the promising tehcnologies for CO2 capture is the spray column. This diploma thesis investigated its potential through a review of available literature and laboratory experiments. Specifically, the work included an overview of absorbents and nozzles. Furthermore, research was conducted on the geometric and operational parameters of spray columns and other similar devices used for CO2 absorption and desorption. These findings led to the construction of a spray column and the execution of experiments. The effect of the type of nozzle used, as well as the effect of CO2 concentration in the supplied gas, the effect of atomization pressure and the effect of temperature on the absorption efficiency in the spray column were investigated. Regeneration experiments were also carried out in a spray column and then on a smaller scale in a steel cylindrical vessel.
|
|
|
Workplace environment monitoring platform
Lipták, Ivan ; Dvořák, Jan (referee) ; Musil, Petr (advisor)
This work focuses on the design and construction of a platform for measuring air quality in the workplace. The platform will collect data on air conditions and subsequently evaluate this data for further processing into a database or possibly alerting the user. The platform will utilize an ESP32 microcontroller, to which various sensors and a display for real-time data visualization will be connected. The design will emphasize on the highest accuracy, flexibility of the device, and its diverse applications in manufacturing halls, offices, or even homes.
|
|
|
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
|
|
|
Monitoring the living environment in the house
Dlugoš, Daniel ; Ježek, Michal (referee) ; Staněk, Kamil (advisor)
This work, tries to create a small, rechargeable and portable device that senses temperature, humidity, barometric pressure, dust particles, carbon dioxide and VOC concentration. The air quality monitor can reliably measure the physical quantities encountered in every indoor environment, evaluate them and display them to the user. The sensors, data storage module and OLED display are housed on a custom-made PCB board.
|
|
|
Carbon Capture Storage/Utilization
Šuráň, Michal ; Baláš, Marek (referee) ; Lisý, Martin (advisor)
The bachelor thesis deals with the issue of CCS and CCU. The main objective is a research of capture, transport, storage and utilization of carbon dioxide, specifically technologies associated with the combustion of fossil and biomass resources. The first part describes fuel transformations and subsequent separation technologies. The second part explains the transport of CO2. The third and fourth chapters refer to methods of storing and using carbon dioxide. The last section focuses on the issue of CO2 capture using biomass resources.
|
|
|
Measuring station firmware for wireless data collection via LoRaWAN
Jánoš, Vít ; Možný, Radek (referee) ; Juráň, Radovan (advisor)
This thesis deals with software development for STM32WL55-JC1 MCU. Development kit was chosen primarily bacause of its LPWAN possibilities. Final prototype communicates on LoRaWAN network. Data are sent through public network from The Things Network, these data are concentrations of carbon dioxide, temperatures and carbon dioxide flux. Data are also backed up locally on SD card along with timestamp. The software was designed with the use of the chamber measurement method in mind, which is also described in the text.
|
guest ::
