National Repository of Grey Literature 25 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Thermoregulatory generator for a small combustion boiler
Kováč, Samuel ; Babička Fialová, Dominika (referee) ; Jecha, David (advisor)
With increasing requirements for the full use of the heat that is produced, the effort to use waste heat is also increasing. One of the possibilities for such heat is the direct conversion of thermal energy into electrical energy. A device called a thermoelectric generator (TEG) is used for this purpose. Nowadays, it is in the constant development part of their existence. The limiting active substance is the known thermoelectric materials. Nevertheless, this technology finds its use in practice. This work is characterized by the basic principles of thermoelectric conversion, the materials discovered so far and their efficiency, and lastly the TEG patients in a lump wood gas boiler. The main idea of the project, which is ongoing in cooperation between BUT and Ecoscroll, is the development of a small combustion device, a household boiler for wood fuel with manual attachment, which would meet the emission parameters of the Ecodesign Directive 2009/125/EC, can function independently of the connection to the electricity network.
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.
Low Energy Solid-State Converters for Energy Harvesting
Znbill, Laila ; Husák, Miroslav (referee) ; Salyk, Ota (referee) ; Boušek, Jaroslav (advisor)
Disertační práce je zaměřena na nízkoenergetické konvertory pro zpracování energie. Pro fotovoltaické generátory pracující při nízké úrovní osvětlení byly navrženy konvertory založené na konfiguraci single cell. Pomocí levných výrobních procesů a dostupných materiálů byl navržen a vyroben jednoduchý a spolehlivý termogenerátor. Výrobní postupy využívaly plazmatické aktivace povrchu pomocí výboje s dielektrickou bariérou a modifikované metody depozice PEDOT. Byly navrženy jednoduché a spolehlivé DC/DC měniče pro nízkonapěťové aplikace jako termoelektrické generátory a fotovoltaické články v konfiguraci single cell. Měniče pracují od napětí několika desítek mV a výstupní napětí může být na úrovni několika voltů. Účinnost se blíží 50% a náklady na materiál a výrobu jsou ve srovnání s použitím běžně dostupných integrovaných obvodů pro Energy Harvesting výrazně nižší. Pro řídicí obvody byly použity bipolární tranzistory, které v režimu velmi malých proudů mohou mít napájecí napětí od 0,5 V. Byla ověřena možnost výroby integrovaných obvodů s extrémně nízkým provozním napětím. Tranzistory FET zde pracují v podprahovém režimu a v režimu Bulk-driven.
Cooker With Thermoelectric Charging
Trchalík, Mirek ; Paluřík, Michal
Our project deals with the development and production of ecological cooker, that, in additionto heating food or water, will also be used to produce elektricity for recharging batteries. Theproduct is intended for those who often camp, fish or stay in nature outside civilization for a longtime. The cooker can be used as a heat source, also in the preparation of meals, in addition to theproduction of electricity after recharging the batteries and powering various electrical devices viaUSB ports.
Applications of thermoelectric generators
Kováč, Samuel ; Konečná, Eva (referee) ; Máša, Vítězslav (advisor)
The work describes the principle of thermoelectric conversion and the phenomenons by which it is mediated, it also deals with the factors that need to be sought in an effort to achieve the best efficiency of thermoelectric conversion. The next part includes an overview of case studies that serve as inspiration for the last, main part of this work, which will deal with the design of thermoelectric generator (TEG) integration. In this work found the procedure of selection of individual components that are not be excluded for the proper functioning of the thermoelectric generator. While the testing is performed on the basis of a mathematical model.It should confirm or refute the implementation of this project. Today, there is an electrical circuit including a thermoelectric generator, a DC converter, and wireless network sensors. The mathematical model confirmed that the TEG would be able to power -pressure, humidity and temperature sensors, at current of 0.314 A. The assumed temperature difference is 70 ° C. The work should acquaint the reader with the main pitfalls of thermoelectric conversion. It could also serve as a support in solving a similar problem of TEG implementation in a particular application.
Energy Harvesting and its capabilities for use in aircraft structure health monitoring
Dvořáček, Zdeněk ; Červenka, Miroslav (referee) ; Koštial, Rostislav (advisor)
The purpose of this bachelor thesis is to analysis of thermoelectric generator as power supply for wireless sensors in aircraft structures monitoring system. The theoretical part contains a research of thermoelectric phenomenon and current solutions. In practical part is a goal to build laboratory teaching model for the analysis of the performance of various types of conventional thermoelectric generators.
Thermoelectric Generators for Micro-CHP Units
Brázdil, Marian ; Navrátil, Jiří (referee) ; Masaryk, Michal (referee) ; Pospíšil, Jiří (advisor)
Small domestic hot water boilers burning solid fuels represent a significant source of air pollu-tion. It is therefore an effort to increase their combustion efficiency and to reduce the produc-tion of harmful emissions. For this reason, the operation of older and currently unsatisfactory types of household boilers has been legally restricted. Preferred types of boilers are low-emission boilers, especially automatic or gasification boilers. Most of them, however, in compar-ison with previous types of boilers, also require connection to the electricity grid. If there is a long-term failure in electricity grid, the operation of newer boiler types is limited. Wood and coal gasification boilers are currently available on the market and can be operated even in the event of a power failure, but only in heating systems with natural water circulation. In heating systems with forced water circulation, these boilers, fireplaces or fireplace inserts with hot-water heat exchangers cannot be operated without external battery supply in the event of a power failure. The dissertation thesis therefore deals with the question of whether it would be possible by thermoelectric conversion of waste heat of flue gases of small-scale low-emission combustion hot water domestic boilers to obtain sufficient electricity, to power supply their circulation pumps and to ensure operation in systems with forced water circulation independently of elec-tricity supply from the grid. In order to answer this question, a simulation tool predicting the power parameters of ther-moelectric generators was created. Compared to previously published works, the calculations and simulations include the influence of the generator on the boiler flue gas functionality. To verify the simulation tool, an experimental thermoelectric generator was built using the waste heat of the flue gas of an automatic hot water boiler for wood pellets. In addition to this genera-tor, there was also created an experimental thermoelectric fireplace insert and other equipment related to these experiments.
Thermoelectric Generator for charging of mobil devices
Nguyen, Michal ; Janák, Luděk (referee) ; Vlach, Radek (advisor)
This thesis deals with a problem of building and measuring the thermoelectric generator for charging a mobile device with use of a candle.
Thermoelectric generators and their use with renewable energy sources
Bajgl, Tomáš ; Radil, Lukáš (referee) ; Baxant, Petr (advisor)
This work revolves around the principle of thermoenergy transforming into electrical energy by using a thermoelectrical generator. It is divided into these sections – theoretical, practical and experimental measurement. In the theoretical section, each thermoelectrical phenomenon is described, the properties of various materials used for production are listed, including their electrical properties and constructions. Then the attention switches to the currently available systems. The practical section includes a design for a device, which purpose is to recharge a mobile phone by using thermoelectric generators, and that section is followed by the elaboration of the measured values.
Evaluation of the power output characteristics of the small-scale thermoelectric generator
Kluzová, Ivana ; Pospíšil, Jiří (referee) ; Brázdil, Marian (advisor)
This bachelor thesis deals with thermoelectric generators and their applications. The introduction is a list of the most used thermoelectric modules in each applications of generators. A description of individual applications thermoelectric generators, divided by different methods of obtaining the heat, followed by their comparison. In conclusion there is a description of the measurement and evaluation of power parameters of thermoelectric modules and thermoelectric generator tested at the Energy Institute BUT.

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