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Schönauer-Kamin, Daniela ; Ewinger, Sebastian ; Exner, Jörg ; Moos, Ralf:
Planar Thermoelectric Generator Transducer for the High-Temperature Characterization of Materials Performance.
2019
Veranstaltung: 38th International Conference on Thermoelectrics
, June 30 - July 4, 2019
, Gyeongju, Korea.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung
,
Vortrag
)
Abstract
Energy harvesting by thermoelectric modules is a promising method in special for the direct conversion of thermal waste energy to electrical energy. Both performance and efficiency of thermoelectric generators (TEG) depend on the used setup of the TEG module and mainly on the properties of the thermoelectric materials. Thermoelectric materials that have sufficient ZT values and that are available, non toxic, cheap, and chemically stable are in the focus of materials research. Besides the material properties, like Seebeck coefficient S, electrical conductivity and thermal conductivity itself, the performance of the material inside the module setup is of great interest. In this work, a planar thermoelectric generator transducer is shown. It can be used to investigate the performance of thermoelectric materials in dependence of the TEG working temperature, the temperature gradient ΔT and the surrounding gas atmosphere. The setup of the designed thermoelectric generator transducer is shown Fig. 1. The mean working temperature is achieved by platinum heater structures on the backside of the alumina substrate. A maximum temperature of around 800 °C is possible. The additional Pt heating structure on the top enables an additional variation of the resulting temperature gradient ΔT. Four Au-Pt thermocouples measure the temperatures. The TEG itself is realized in unileg design. As thermoelectric material, a p type nickel doped delafossite CuFeO 2 is applied by aerosol deposition method (ADM). Four thermoelectric couples are achieved by connecting the deposited delafossite films by platinum conductors (n type). The delafossite has an S between 300 and 400 µV/K at 500 to 600 °C. The TEG characteristics are analyzed in N2 atmosphere at varying temperature and temperature gradient ΔT in dependence of the load resistance. Current voltage curves and resulting electrical power are shown in Fig. 2. The I-U curves behave linearly, as expected, and increase with increasing temperature and increasing temperature gradient. Also, the electrical power exhibits the typical behavior. The maximum power point MPP depends on ΔT and temperature. The realized TEG transducer allows to easily compare the behavior of the rmoelectric materials applied as films and offers a tool to evaluate the TEG performance under various gas atmospheres at a broad temperature range.
Weitere Angaben
| Publikationsform: | Veranstaltungsbeitrag (Vortrag) |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Fakultäten > Fakultät für Ingenieurwissenschaften Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien > Lehrstuhl Funktionsmaterialien - Univ.-Prof. Dr.-Ing. Ralf Moos Profilfelder > Advanced Fields > Neue Materialien Forschungseinrichtungen > Forschungszentren > Bayreuther Materialzentrum - BayMAT Fakultäten Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien Profilfelder Profilfelder > Advanced Fields Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften |
| Eingestellt am: | 18 Jul 2019 07:24 |
| Letzte Änderung: | 18 Jul 2019 09:52 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/51528 |