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Evaluation of the power output characteristics of the small-scale thermoelectric generator
Frank, Vojtěch ; Pospíšil, Jiří (referee) ; Brázdil, Marian (advisor)
This thesis describes measuring of thermoelectric modules. The thesis includes description of specific measured variables including measurement methodology. There are also described principles of different measurement methods and approaches used to measure the variables. Measurement was done to find modules suited for usage in thermoelectric generator. The modules were installed onto thermoelectric generator and measurement of current-voltage curves with different states of boiler Verner A 251.1 were done.
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Compared to domestic heating boilers
Budai, Karel ; Brázdil, Marian (referee) ; Baláš, Marek (advisor)
This bachelor thesis deals with assessment of domestic heating boilers. The first chapter describes the technology of boilers for heating a family house per the used fuel. The second chapter deals with the comparison of the legislative requirements imposed on the solid fuel and natural gas boilers. The final chapter deals with the economic assessment of selected boilers in terms of acquisition and operating costs.
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Home photovoltaic power plant
Brázda, Kryštof ; Brázdil, Marian (referee) ; Pospíšil, Jiří (advisor)
This thesis is focused on evaluation of operational parameters and economic return of photovoltaic power plant installation on chosen family house. In thesis there is elaborated a detailed overview of energy consumption of selected house. The photovoltaic power plant is designed for the selected object. Two possible variants of the system solution with regard to the use of accumulation, sale of surplus electric energy management and procurement priorities.
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Calculation of flue gas properties
Štenclová, Kristýna ; Brázdil, Marian (referee) ; Pospíšil, Jiří (advisor)
This Bachelor´s thesis deals with properties of combustion products depending on temperature. The first part is theoretical and includes summary of basic terms of combustion. The second part includes a recherché. It is focused on elementary analysis of fuel and basic properties of combustion products, i.e. heat capacity, density, enthalpy, heat conductivity, kinematic viscosity and number of Prandtl. In the last part of thesis, there is an example of a spe-cific exchanger and his solving based on four various inputs of these properties.
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Lifetime and reliability of thermoelectric modules
Rešiliáno, Tomáš ; Šnajdárek, Ladislav (referee) ; Brázdil, Marian (advisor)
The thesis describes the construction of thermoelectric modules used for both electricity production and cooling. Above all, the thesis describes the influences, along with their causes and consequences, that have a major impact on reliability and long-term operation of thermoelectric modules. The thesis further describes the basic quantities with which we can assess the thermoelectric modules and also describes basic methods to measure these quantities. For the purposes of the thesis was conducted an experiment, during which the internal electrical resistance of unused, used and damaged thermoelectric modules was measured. The results were compared with the physical condition and operational history of the measured thermoelectric modules.
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Reduction of energy intensity of the house
Šalšová, Bára ; Brázdil, Marian (referee) ; Baláš, Marek (advisor)
Bachelor thesis deals with reduction of energy intensity of the house. Firstly a model house is described which is subsequently used for proposal of thermal insulation arrangement for decrease in heat losses caused by pervasion. In addition a summary of insulation materials that can be used for external wall insulation is included. In the theoretical part of this bachelor thesis reader finds description of the Trombe wall which is used as a passive element for effective utilization solar energy. The last part of the thesis looks into calculation of devised thermal output for all options of thermal insulation. Finally these options are compared and the most advantageous of them is determined.
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Efficiency of the energy use of biomass
Szelecky, Zsolt ; Brázdil, Marian (referee) ; Baláš, Marek (advisor)
This final thesis deals with the theme of energetic usage of biomass and its energy efficiency. In the first part the term „biomass“ is explained and classified into categories. The main part of this work deals with technology converts of raw biomass into valuable energy products. The final section is closely connected with the previous part, where the emphasis is placed on energetic effiency of abovementioned technology converts.
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Automatic solid fuel boilers
Klíma, David ; Brázdil, Marian (referee) ; Štelcl, Otakar (advisor)
This bachelor thesis deals with automatic solid fuel boilers. In the first part describes individual solid fuels, which are suitable for combustion in automatic boilers. In the second part is described and divided automatic boilers and their parts. The third part focuses on the economics and ecology of boilers. The last part of the bachelor thesis describes the experiment measured at the testing room.
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Ranque - Hilsh vortex tube
Bábor, Lukáš ; Brázdil, Marian (referee) ; Šnajdárek, Ladislav (advisor)
Ranque-Hilsh vortex tube is a device that converts high pressure gas flow into two low pressure flows with higher and lower temperature, than a temperature of the inlet flow. Technically, it is a device of very simple construction, which is characterised by low initial costs, high endurance, durability and low maintenance. Its main disadvantage is low coefficient of performance, compared to conventional heat pumps at room temperature. In the first section of this paper, examples of applications where utilization of Ranque-Hilsh vortex tube is advantageous are given. Afterwards, several theoretical concepts of refrigeration cycles utilizing vortex tube to lower energy consumption are described. The final section of this thesis introduces new geometry of inlet nozzles for improving coefficient of performance of vortex tube. This geometry is then compared to straight tangential nozzles of circular cross-section. During the measurements, surface temperature of the vortex tube with respect to its length is monitored.
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