National Repository of Grey Literature 9 records found  Search took 0.01 seconds. 
A test setup for thermal cycling of thermoelectric modules
Preisler, Lukáš ; Kudela, Libor (referee) ; Brázdil, Marian (advisor)
The present work is focused on thermoelectric modules and testing modes. Failures of thermoelectric modules occur due to the cyclic thermal stress in real applications and their power parameters decrease. Hence an experimental study of thermoelectric modules was executed, which measured parameters of thermoelectric modules and thermal cycling testing methods. In the practical part of this document, the thermal cycling conditions of thermoelectric modules were set-based on the previously stated study. A bipolar-pulse load in range +3,0 V and 3,0 V was proposed alternating after 90 seconds. For comparison of the modules among producers 200 cycles will be made. According to the cycling conditions, construction adjustments of current laboratory testing platform are proposed. The current platform is currently set to measure parameters of thermoelectric modules and is not for cycling load testing.
Application of MEMS technology in the field of thermoelectric generators
Janák, Luděk ; Brázdil, Marian (referee) ; Ančík, Zdeněk (advisor)
Práce je zaměřena na moderní oblast využití MEMS technologií v oblasti termoelektrických generátorů. Úvodem jsou diskutovány základní principy konstrukce a výroby MEMS TEG modulů. Praktická část práce sestává z ověření parametrů komerčního MEMS TEG modulu měřením a jeho simulace. Simulace je provedena pomocí MATLAB/Simulink i analytických metod. V závěru práce je na základě získaných poznatků provedeno zhodnocení využití metod „thermal energy harvesting” v oblasti letecké techniky.
A test setup for thermal cycling of thermoelectric modules
Preisler, Lukáš ; Kudela, Libor (referee) ; Brázdil, Marian (advisor)
The present work is focused on thermoelectric modules and testing modes. Failures of thermoelectric modules occur due to the cyclic thermal stress in real applications and their power parameters decrease. Hence an experimental study of thermoelectric modules was executed, which measured parameters of thermoelectric modules and thermal cycling testing methods. In the practical part of this document, the thermal cycling conditions of thermoelectric modules were set-based on the previously stated study. A bipolar-pulse load in range +3,0 V and 3,0 V was proposed alternating after 90 seconds. For comparison of the modules among producers 200 cycles will be made. According to the cycling conditions, construction adjustments of current laboratory testing platform are proposed. The current platform is currently set to measure parameters of thermoelectric modules and is not for cycling load testing.
Application of MEMS technology in the field of thermoelectric generators
Janák, Luděk ; Brázdil, Marian (referee) ; Ančík, Zdeněk (advisor)
Práce je zaměřena na moderní oblast využití MEMS technologií v oblasti termoelektrických generátorů. Úvodem jsou diskutovány základní principy konstrukce a výroby MEMS TEG modulů. Praktická část práce sestává z ověření parametrů komerčního MEMS TEG modulu měřením a jeho simulace. Simulace je provedena pomocí MATLAB/Simulink i analytických metod. V závěru práce je na základě získaných poznatků provedeno zhodnocení využití metod „thermal energy harvesting” v oblasti letecké techniky.
Vliv depozičních podmínek na "power factor " (účiník) tenkých termoelektrických vrstev
Zeipl, Radek ; Walachová, Jarmila ; Pavelka, Martin ; Jelínek, Miroslav
The influence of preparation conditions on the power factor and the dependency of the Seebeck coefficient on conductivity for prepared layers were explored. Layers were prepared by laser ablation from Bi.sub.2./sub.Te.sub.3./sub. target on quartz glass substrates. Thickness of layers changed from 13nm to 400nm, the temperature of the substrate during deposition varied from 300.sup.o./sup.C to 480.sup.o./sup.C and density of energy of laser beam from 2J/cm.sup.2./sup. to 10J/cm.sup.2./sup..
Annealing of Bi.sub.2./sub.Te.sub.3./sub. thin films prepared by pulsed laser deposition
Pavelka, Martin ; Zeipl, Radek ; Jelínek, Miroslav ; Walachová, Jarmila ; Studnička, Václav
Bi.sub.2./sub.Te.sub.3./sub. thin films were prepared by laser ablation /PLD/ at room temperature and then annealed in argon atmosphere. Anneling is a widely used method of film properties /primarily crystallinity/ improvement. The influence of annealing on transport properties was studied.
Modification of Bi.sub.2./sub.Te.sub.3./sub. nanolayers
Zeipl, Radek ; Pavelka, Martin ; Jelínek, Miroslav ; Vaniš, Jan ; Šroubek, Filip ; Walachová, Jarmila
Our Bi.sub.2./sub.Te.sub.3./sub. nanolayers were prepared by laser ablation. If we use different depositon condition, prepared layers will have different properties, exactly with rising temperature of substrate during deposition laeyrs becoming smoother. We present STM picture of 60nm thick Bi.sub.2./sub.Te.sub.3./sub. prepared on substrate with temperature during deposition of 400.sup.0.sup.C. We also present modification of layer after many scans were realized by STM on the same place.
Thickness dependence of transport properties of Bi.sub.2./sub.Te.sub.3./sub. layers
Zeipl, Radek ; Lošťák, P. ; Pavelka, Martin ; Žďánský, Karel ; Jelínek, Miroslav ; Walachová, Jarmila
The transport properties of layers, prepared by laser ablation, as Hall mobility and conductivity on their thickness at room temperature are presented. This thermoelectric materials is potential candidate for many applications as for thermoelectric devices for power generation, cooling and sensors.
Thickness dependence of transport properties of Bi.sub.2./sub.Te.sub.3./sub. layers
Zeipl, Radek ; Lošťák, P. ; Pavelka, Martin ; Žďánský, Karel ; Jelínek, Miroslav ; Walachová, Jarmila
The transport properties of layers, prepared by laser ablation, as Hall mobility and conductivity on their thickness at room temperature are presented. This thermoelectric materials is potential candidate for many applications as for thermoelectric devices for power generation, cooling and sensors.

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