|
|
Car cabin passive cooling system performance study
Viščor, Petr ; Hejčík, Jiří (referee) ; Fišer, Jan (advisor)
The work is focused on issue of passive cooling in a cabin of a car. The basic principles and mechanisms of heat transfer are described in the theoretical part and the quality of cabin environment in terms of thermal comfort and air quality is discussed as well. Next part of the work describing the principles of ventilation and air conditioning of cabins and possible methods of passive cooling are discussed. Passive cooling means decrease of temperature of cars interior, without need of energy supply from car battery, or fuel. The last part of the work includes numerical simulation of selected methods of passive cooling using the THESEUS-FE 3.0 software. Simulations were performed on model of Volkswagen Polo car and primarily were focused on testing of functionality of various methods of passive cooling.
|
|
|
Heating and ventilation in the „Emotivní dům“
Brázda, Jan ; Fišer, Jan (referee) ; Charvát, Pavel (advisor)
This master’s thesis deals with the design of the heating and ventilation system for the ‘Emotivní dům’ which was designed by the author of this thesis. The first part of the thesis provides an overview of the project and the architectural design of the house. In the next part, the calculation of the heat loss and the design of the heating and ventilation system is described. War-air heating/ventilation is used in in the habitable rooms of the house with the hydronic system utilized in other spaces. The floor heating is used in the bathrooms and the other non-habitable spaces, such as the garage, are heated with radiators. A natural gas boiler is used as a heat source for both space heating and domestic hot water heating. The thesis contains the floor plans of the house as well as technical drawings of the heating and ventilation system.
|
|
|
Possibilities of energy savings
Palkovič, Peter ; Fišer, Jan (referee) ; Hejčík, Jiří (advisor)
The work is mainly engaged in electricity savings opportunities in fair housing unit 3+1 in the locality Brno - Černá Pole due to confusion classic appliances for more efficient appliances with lower power consumption. In the introductory part of the thesis is a description of the energy label for household appliances with calculations for inclusion in the energy classes according to the most recent applicable regulations, directives and regulations of the Ministry of Industry and Trade. The next section describes the structure of electricity prices coupled with monthly fees and possible financial savings in changing the current supplier for another. In the last part of the thesis describes the specific consumption of each appliance is switched on and in StandBy mode and replacing them with more efficient appliances. Finally, the representation of the return on investment for those changes, calculated total annual consumption and costs for energy consumption in apartment 3+1.
|
|
| |
|
|
Gray water heat exchangers
Devečka, Viktor ; Tuhovčák, Ján (referee) ; Fišer, Jan (advisor)
In the present development of building industry and increasing demands for convenience and comfort of living, energy demands of buildings are also getting higher. After heating, the second largest costs are for the production of hot water. Use of hot water produces grey water with high residual thermal energy, which is drained into sewage. The heat recovery system of grey water solves this heat loss problem. This paper deals with the possibilities of using the heat of grey water. It is aimed mainly at the use of heat energy from grey water to reduce the cost of preparation of hot water. The paper analyzed the energy consumption in buildings. Subsequently, it focuses on the methods of using heat from grey water. It familiarizes with the methods of thermal energy recovery and describes drain water heat recovery system. Drain water heat recovery systems' producers from Czech and Slovak market are named. In conclusion, there are two modeling studies evaluating heat recovery system's efficiency.
|
|
|
An induction machine with solid rotor
Fišer, Jan ; Klíma, Jiří (referee) ; Mach, Martin (advisor)
This master’s thesis is focused on induction motor with solid rotor. The introduction is dedicated to the full analysis of the rotor. Then model of motor with solid rotor was designed in 2D and 3D. Simulations of these models were carried out using the finite elements method. Further in this thesis there are laboratory measurements` results due to the motor`s sample. Based on the results from simulations and measurements rotor modifications have been proposed, which led to improved machine parameters. 2D models have been developed by rotor modifications. These models went through finite elements method`s simulation. In the conclusion of the thesis there are all results from measurements and simulations compared.
|
|
|
Real consumption of primary energy of plug-in hybrid and electric cars
Bochníček, Ondřej ; Pokorný, Jan (referee) ; Fišer, Jan (advisor)
The topic of bachelor thesis is to evaluate a consumption of primary energy in electric cars and plug-in hybrids depending on the place of the operation and also to compare a particular representative with similar classic cars with combustion engine. Another criterion used for evaluation is the emission of carbon dioxide for one driven kilometer. For the consumption of primary energy in electric cars and plug-in hybrids is essential to know how is the electricity produced in the chosen area. With the energy mix of each state, characteristics of given ways of producing electricity and consumptions of selected cars the consumption of primary energy of selected cars and emission of carbon dioxide for one driven kilometer were determined. From the computed data results, that the lowest energy consumption have the electric cars driven in countries with dominant representation of renewable energy sources. Conversely the worst conditions are in the countries with high part of fossil fuels in electricity production. From the comparison of single electric cars and plug-in hybrids with classic cars results that electric cars or plug-in hybrids are at the time of writing this thesis practically in all cases more energy efficient and also produce less emission of carbon dioxide.
|
|
|
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.
|
|
|
Drivers clothing thermal resistance database for iHVAC system
Hrubanová, Kristýna ; Pokorný, Jan (referee) ; Fišer, Jan (advisor)
This diploma thesis is focused on measurement of thermal properties of clothes by thermal manikin and on application of results for prediction of thermal comfort in system iHVAC. First part of thesis is dedicated to research with relation to this topic and to definitions of main computational equations necessary for experimental measurement. The choise of method for measurement based on available standards is an important part of this thesis. The main focus of thesis lies on measuring 5 combinations of clothes at different calibration temperatures and same temperature of manikin surface. Then data are examined and also the analysis of uncertaities and repeatability is maked. According to assupmtion , the independence of value of heat transfer coefficient to ambient temperature is comfirmed and calculated heat resistance of every single clothes is compared to existing wardrobe for system iHVAC. The outcome of this thesis is specificied and completed virtual wardrobe which serves to prediction of thermal comfort in car.
|
|
| |
guest ::
