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dc.contributor.author
Bitschi, Andreas
dc.contributor.supervisor
Weidenkaff, A.
dc.contributor.supervisor
Fröhlich, Klaus
dc.date.accessioned
2017-08-17T11:34:26Z
dc.date.available
2017-06-08T21:56:37Z
dc.date.available
2017-08-17T11:34:26Z
dc.date.issued
2009
dc.identifier.uri
http://hdl.handle.net/20.500.11850/15932
dc.identifier.doi
10.3929/ethz-a-005936533
dc.description.abstract
The efficient usage of energy at all stages along the energy supply chain and the utilization of renewable energies are very important elements of a sustainable energy supply system. Especially at the conversion from thermal to electrical power a large amount of unused energy (“waste heat”) remains. This energy, because of its relatively low temperature und low energy density can generally not be used for the generation of electrical power by the conventional thermodynamic cycles (Clausius Rankine, ORC, Kalina). Direct thermal to electrical energy conversion, without the intermediate step of kinetic energy, that is with no moving parts, therefore gives an alternative of high potential. The improvements in material sciences and the progress of nanotechnology bring thermoelectric materials and therefore thermoelectric converters to renewed significance. The efficiency of thermoelectric converters in general depends on material parameters summarized in the figure of merit ZT. Furthermore design aspects, especially the leg length, and heat transfer conditions have a significant influence on power output and efficiency. The main goal of the project “The thermoelectric power plant”, a cooperation of EMPA Dübendorf and ETH Zurich, Power systems and High voltage laboratories, is to show the feasibility of a thermoelectric power generation unit. Therefore theoretical calculations and selected experiments have been carried out. The goal of this work was the development of tools for the evaluation of thermoelectric power generation units and devices. The modelling has been done on two size levels. On the large scale level a high number of thermoelectric modules have been integrated in a heat transfer unit, respectively a cross-flow heat exchanger. On the lower size level the modules were modelled in 3D including all non-linearities and irreversibilities and simulated with the method of the finite elements (FE). For the validation of the FEsimulation prototypes of thermoelectric oxide modules (TOM) were created at EMPA Dübendorf, the power output characteristics measured and compared with the results of the simulation. The conformity of the results was quite satisfying and could be multiple reproduced. The simulation gives new access to the interior of thermoelectric modules, which will be very important for future development steps. Different optimization strategies can be operated with little expenditure of time and resources. As an example electric power generation based on a thermoelectric generator utilizing geothermal energy is presented and discussed. The next step would be the integration into several energy systems and the simulation of their dynamic behaviour.
en_US
dc.language.iso
en
en_US
dc.publisher
ETH
en_US
dc.rights.uri
http://rightsstatements.org/page/InC-NC/1.0/
dc.subject
THERMOELECTRIC GENERATORS (THERMOELECTRIC ENGINEERING)
en_US
dc.subject
THERMOELEKTRISCHE GENERATOREN (THERMOELEKTROTECHNIK)
en_US
dc.subject
MATHEMATICAL MODELING IN ENGINEERING AND TECHNOLOGY
en_US
dc.subject
ELECTRIC POWER ENGINEERING + ELECTRIC POWER GENERATION
en_US
dc.subject
THERMOELEKTRISCHE EFFEKTE (ELEKTRODYNAMIK)
en_US
dc.subject
STROMERZEUGUNG + ELEKTRISCHE ENERGIETECHNIK
en_US
dc.subject
THERMOELECTRIC EFFECTS (ELECTRODYNAMICS)
en_US
dc.subject
MODELLRECHNUNG IN TECHNIK UND INGENIEURWESEN
en_US
dc.title
Modelling of thermoelectric devices for electric power generation
en_US
dc.type
Doctoral Thesis
dc.rights.license
In Copyright - Non-Commercial Use Permitted
ethz.size
145 S.
en_US
ethz.code.ddc
6 - Technology, medicine and applied sciences::621.3 - Electric engineering
en_US
ethz.identifier.diss
18441
en_US
ethz.identifier.nebis
005936533
ethz.publication.place
Zürich
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
03477 - Fröhlich, Klaus
en_US
ethz.leitzahl.certified
03477 - Fröhlich, Klaus
ethz.date.deposited
2017-06-08T21:57:00Z
ethz.source
ECOL
ethz.source
ECIT
ethz.identifier.importid
imp59366ade9ea5153159
ethz.identifier.importid
imp59364c5b97eff82728
ethz.ecolpid
eth:470
ethz.ecitpid
pub:27765
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-15T06:23:45Z
ethz.rosetta.lastUpdated
2017-08-17T11:34:39Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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