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Design and measurement of a small induction motor
Fišer, Jan ; Klíma, Jiří (referee) ; Mach, Martin (advisor)
This bachelor thesis deals with design and measurement of a small induction motor. The introduction describes a structure and an operating principle of the induction motor. The following part deals with analytical calculation of three-phase induction motor‘s properties. Next are executed an analytical calculations and a finite element method calculations by the Maxwell software. In the end are these calculations compared with results from measurement.
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Space heating and ventilation in a bungalow family house
Menšík, Marek ; Fišer, Jan (referee) ; Charvát, Pavel (advisor)
This diploma thesis deals with design of ventilation and heating of bungalow single-storey house. The work is divided into three parts. In the first part is presented the design of the house with calculation of heat losses. The second part deals with the design, calculations and regulation of the heating of the house. In the third part there is designed a system of forced ventilation for the house.
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Environmental control system of aircraft cabin
Fojtlín, Miloš ; Hejčík, Jiří (referee) ; Fišer, Jan (advisor)
In this research work available information about air-conditioning systems of actual airliners are processed. These systems solve in complexity aircraft cabin microclimate modification into form comfortable and acceptable for the human body (ECS – enviromental control system). The work also covers ECS subsystems description. It explains their function, thermalmechanical principle, different possibilities of their realization and overall ECS function. Examples of ECS negative impact on other aircraft systems are also mentioned. Afterwards, real schemes of ECS built on board are sketched. The paper also presents reasons of ECS introduction, concrete requirements to cabin microclimate out of consideration to safe stay of human bean on board in different flight procedures. Simultaneously technical obstacles and limitations of ECS are shown. In conclusion need of correct ECS function is highlighted.
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Heat recovery ventilation unit
Balák, Jan ; Fišer, Jan (referee) ; Hejčík, Jiří (advisor)
This bachelor thesis will inform readers about residental buildings ventilation posibilities, higyenical standarts of ventilation, sorting of heat recovery units used for heat recovery in residental buildings. Moreover, specific house will be choosen and its ventilation demands will be calculated. Than conveniend ventilation and heat recovery equipment will be search, because of optimalization of ventilation and heat losses.
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EV vehicle cabin thermal management strategy in hot and cold climates
Matušková, Lucie ; Charvát, Pavel (referee) ; Fišer, Jan (advisor)
The goal of the work is to conduct an experiment to measure the temperature at which optimal thermal comfort is achieved. The experiment is carried out in a climate chamber, where constant climatic conditions acting on the vehicle can be ensured. The iHVAC measuring system is used to measure thermal comfort. Then to compare the values with the previous measurement that took place for other vehicles. Part of the work is devoted to research that describe the issue of thermal management of vehicles.
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Application of the Life Cycle Assessment (LCA) method to passenger cars
Šándor, Kristián ; Mišík, Ondrej (referee) ; Fišer, Jan (advisor)
The electrification of personal transport is an intensely discussed and relevant topic in 2023. The motivation behind this master thesis was to compare the lifetime energy consumption of vehicles equipped with internal combustion engines, battery-powered electric systems, and fuel cells. The theoretical part of this master thesis includes the introduction and explanation of the method by which a product lifecycle is assessed, known as LCA. The dissertation includes a chapter detailing the main components of automobiles, followed by a chapter which has calculations the energy consumption of production, operation, and recycling or destruction of the automobiles. The outcome of the theoretical part shows that the lifecycle of a battery-powered electric car is the least energetically costly, followed by internal combustion cars, and fuel cell cars being the most energy costly. The practical part of this master thesis involved a physical decomposition of a vehicle with an internal combustion engine with the aim of obtaining the material composition of its components and applying the LCA method on the vehicle Skoda Octavia III. The thesis sparks future research and eco-friendly alternatives in personal transportation.
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Heat transfer from the surface of the human body - validation of a CFD thermal manikin model
Kuruc, Jan ; Pokorný, Jan (referee) ; Fišer, Jan (advisor)
This master thesis is focused on CFD simulation of heat transfer from a thermal manikin in a calibration environment and its subsequent validation based on the experiments already performed in the master thesis of Ing. Fojtlín and Ing. Hrubanová. The main objective of the work is to find and test a suitable combination of physical models and set boundary conditions in the simulation model so that the actual heat transfer and airflow processes from the validation experiments are faithfully simulated. In the course of the work, 7 cases were simulated based on individual measurements made during the experiments. The calculated heat transfer coefficients of the thermal mannequin segments for each simulated case can be considered as the main results of the simulation. For the experiment of Ing. Fojtlín, these are the heat transfer coefficients by radiation and convection. For the experiment of Ing. Hrubanová, the total heat transfer coefficients for a manikin with five selected clothing assemblies were determined. Validation was performed by comparing the simulated and experimentally determined values of heat transfer coefficients. Based on the comparison, the developed simulation model could be declared validated.
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Fast charging of EV vehicles - overview of technologies
Boršoš, Adam ; Charvát, Pavel (referee) ; Fišer, Jan (advisor)
Charging speed is one of the key parameters that affects the attractiveness of electric cars for drivers. Therefore, it is important to determine the methods that can charge the electric car as quickly as possible. An overview of electric vehicle charging technologies and the identification of those that are considered fast charging has been made. It has been found that the fastest technology is DC charging. A list of six connectors that allow this charging has also been created. These were then compared. An overview of charging networks, that enable fast charging, was made in the next chapter. The three largest providers of charging stations in the Czech Republic and also the two that specialize in fast charging were listed. The topic of battery cooling is also related to charging. Therefore, the following chapter provides an overview of technologies that are used to cool batteries. The last part focuses on the factors that cause the degradation of batteries. An overview of the four main causes of degradation and their effect on the battery was demonstrated.
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Ventilated protective clothing for healthcare staff in contaminated environments
Štenclová, Kristýna ; Kopečková, Barbora (referee) ; Fišer, Jan (advisor)
Focus of the masters thesis is experimental verification of cooling effect of ambient air stream directed under a protective clothing of a human. The first part is a review of literature encompassing concepts related to thermal comfort and heat transfer. Possibilities of cooling a human who is moving in high ambient temperature environment are introduced in this part. The second part is focused on hypotheses devised and experiments performed. The last part is focused on results of the experiments and their comparison with an experiment described in literature.
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