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Design and construction laboratory exercise with Peltier cell
Mejzlík, Michal ; Šlezingr, Jan (referee) ; Macháček, Jan (advisor)
The introduction of this paper describes three thermoeletrical effects and their properties. It also deals with thermoelectrical cells, which are using Seebeck´s and Peltrier´s effects. The paper decribes principles how the Peltier´s cells work, their mathematical model, construction and practical use. The paper shows what kinds, shapes and output we can meet at the market and which kinds of parameters regulate their selection. The paper suggests the possibility to measure characteristic behaviour and quantity during laboratories tasks and their evaluations. At the conclusion is adduced the suggestion of laboratory task together with theoretically made pilot protocol.
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Possibilities of waste heat recovery from internal combustion engines
Křivák, Petr ; Pospíšil, Jiří (referee) ; Brázdil, Marian (advisor)
Increasing demands for vehicular traffic to reduce the environmental impact and consumption of fossil fuels, led an effort to increase the efficiency of the combustion process and the car as a whole. One way to achieve this is to use the waste heat of the combustion process, especially waste heat of exhaust gases. This heat can be converted into electrical energy. Consumption of electricity in modern cars is increasing. The presented work deals with the possibilities, how to using waste heat of exhaustgases from internal combustion engine. Focused on application of producing electricity. The paper analyzed the current state of car traffic, and then provides an overview of possible technological solutions using waste heat of exhaust gases. The main part is devoted to thermoelectric generators, their construction and possible design. In conclusion is made the energy balance with use thermoelectric generator.
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Thermoelectric properties of alkali activated aluminosilicates
Filipská, Kristýna ; Fiala,, Lukáš (referee) ; Zmeškal, Oldřich (advisor)
This work focuses on the potential usage of alkali-activated aluminosilicates (AAA) in relation to energy harvesting. It sets a goal of familiarizing the reader with thermoelectrical conversion itself and its existence within those materials. Based on this knowledge, the measurement of thermoelectrical voltage has been conducted in chosen mixtures of AAA; more specifically a slag geopolymer with carbon black admixture, a slag geopolymer with graphite powder admixture and a metashale geopolymer with graphite powder admixture. This experiment was executed by repeated heating of the surface area of the sample on one side using a resistor, while the other side was kept at reference temperature. The response in the form of voltage generated in the sample as well as on the electrodes was recorded. The measured values were then used to calculate the Seebeck coefficient. The best response was provided by a slag geopolymer sample with carbon black admixture at 4 % concentration (|| = 1904 V/K). The second goal was to measure thermal properties of those samples, specifically the specific heat capacity, the thermal conductivity coefficient and thermal diffusivity. This goal has been reached by capturing the samples with a thermal camera while heating them on a hot-plate. The highest values of specific heat capacity and the thermal conductivity coefficient were provided by a sample of metashale geopolymer with graphite powder admixture at 8 % concentration (c = 2086 J/kg/K; = 1,815 W/m/K). Thermal diffusivity proved to be almost identical in all samples, 610-7 m2/s on average. Based on the results, we conclude that the thermoelectrical conversion in these materials is not enough to be significant in bigger scale energy harvesting yet. However, we also believe that it’s possible to reach better results with further research.
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Thermoelectric Power Generation System
Brázdil, Marian ; Nerud, Pavel (referee) ; Pospíšil, Jiří (advisor)
In the last decade there is a rising interest in thermoelectric applications. Thermoelectric generators enabling the direct conversion of the heat into the electricity become attractive. This fact is caused by the demands of environmental operation and saving primary resources. Scientists intensively investigate and develop new materials and structures suitable for these applications. The efficiency of the thermoelectric conversion progressively increases. Unfortunately we have no available materials with sufficient thermoelectric properties which could provide cost-competitive price. Thermoelectric generators seem to be useable devices. For example, in case of the unused waste heat using of the thermoelectric generator can increase the overall effectiveness of the unit despite the low efficiency of the generator. This master thesis deals with the issue of the Peltier modules representing the main part of the thermoelectric generators. The physical principles and structures of the thermoelectric modules and the possibility of thermoelectric power production are described here. In the practical part of this thesis the design of the low power generator utilizing waste heat from biomass boiler Verner A 251.1 is proposed.
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Thermocouple simulator
Nermut, Martin ; Michalec, Jaroslav (referee) ; Klusáček, Stanislav (advisor)
NERMUT, M. Thermocouple simulator. Brno: Brno University of Technology, Faculty of Eletrical Engineering and Communication. 2009. 62 s. Supervisor Ing. Stanislav Klusáček. Consultant Ing. Miroslav Krupa, - IDC Brno, Honeywell s.r.o. The aim of the thesis is design and realization of handheld thermocouple simulator, suitable both for laboratory and plant use. Manual or remote control via RS232 are possible. Special attention is focused on universality, easy and safety use (galvanic isolation), properly cold junction compensation, easy calibration of non-linearity. Sponsor: IDC Honeywell, Brno, Czech Republic Basic literature: - OMEGA Temperature Handbook) - Datasheets of OMEGA instruments (www.omega.com) - Datasheets of other vendor instruments (www) - Isotech Traceable Book – Temperature Calibrabration (www.isotech.co.uk) - BELZA J., Buld-in Li-ion accu charger (www.belza.cz) Appendixs: - User manual - Schematic - Calibration data - CD (source code)
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Different way how to use solar radiation for the electric energy production
Obadal, Petr ; Křivík, Petr (referee) ; Vaněk, Jiří (advisor)
The thesis deals with the problem of potential use of solar energy through the conversion into electric energy. The thesis analyses in great detail several types of conversion. My special concern included photovoltaic conversion and thermal conversion of solar energy using steam turbines for energy production. In the subsequent parts, I focus on the problem of photovoltaic, photovoltaic systems, and solar thermal power plants, their installation and use.
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Design and construction laboratory exercise with Peltier cell
Mejzlík, Michal ; Šlezingr, Jan (referee) ; Macháček, Jan (advisor)
The introduction of this paper describes three thermoeletrical effects and their properties. It also deals with thermoelectrical cells, which are using Seebeck´s and Peltrier´s effects. The paper decribes principles how the Peltier´s cells work, their mathematical model, construction and practical use. The paper shows what kinds, shapes and output we can meet at the market and which kinds of parameters regulate their selection. The paper suggests the possibility to measure characteristic behaviour and quantity during laboratories tasks and their evaluations. At the conclusion is adduced the suggestion of laboratory task together with theoretically made pilot protocol.
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Applications of thermoelectric generators
Kopřiva, Lukáš ; Pospíšil, Jiří (referee) ; Brázdil, Marian (advisor)
This bachalor thesis is about thermoelectric generators and their utilization. Basic physical principles of thermoelectric conversion and design of thermoelectric devices are described at the beginning. Next part of thesis is related to practical applications of themoelectric generators. Applications that using fossil fuels, waste heat and renewable energy are mentioned. Conclusions and evaluations of their usefulness are made at the end.
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Thermoelectric generator for flue-gas duct of boiler to convert low-temperature waste heat to electricity
Třináctý, Jiří ; Baláš, Marek (referee) ; Brázdil, Marian (advisor)
With the dwindling supply of fossil fuels is increasing interest in the most efficient use of primary energy sources. In many of today's devices leaving a considerable part of the fuel energy wasted in the form of waste heat. As a partial solution suitable to demonstrate the application of thermoelectric generator, or devices that convert heat energy directly into electrical energy. The trend in recent years shows the growing interest in this technology and the development of new thermoelectric materials. In addition to the use of waste heat thermoelectric generators can be found in a number of other applications, primarily as a source of electricity in conditions where required minimal maintenance, reliability, reliability and durability. Text is divided into three parts: a theoretical part, the part dealing with the design and implementation of the generator, and a final evaluation. The theoretical part includes a description of the basic thermoelectric phenomena, thermoelectric materials and their properties, a description of the main components of thermoelectric generators and applications in which the thermoelectric conversion uses. Part of the design and implementation deals with the design of thermoelectric generator for chimney flue and comparison of the proposal with real measured values.
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