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Performance optimization of a thermoelectric generator element with linear, spatial material profiles in a one-dimensional setup

Published online by Cambridge University Press:  29 June 2011

Knud Zabrocki ,
Eckhard Müller ,
Wolfgang Seifert  and
Steffen Trimper
Knud Zabrocki*
Affiliation:
Institute of Materials Research, German Aerospace Center (DLR), D-51170 Köln, Germany
Eckhard Müller
Affiliation:
Institute of Materials Research, German Aerospace Center (DLR), D-51170 Köln, Germany
Wolfgang Seifert
Affiliation:
Institute of Physics, University Halle-Wittenberg, D-06099 Halle, Germany
Steffen Trimper
Affiliation:
Institute of Physics, University Halle-Wittenberg, D-06099 Halle, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Graded and segmented thermoelectric elements are studied in order to improve the performance of thermogenerators that are exposed to a large temperature difference. The linear thermodynamics of irreversible processes is extended by assuming spatially dependent material parameters like the Seebeck coefficient, the electrical and thermal conductivities. For the particular case in which these transport coefficients exhibit a constant gradient, we present an analytical solution of the one-dimensional thermal energy balance in terms of Bessel functions. Given linear spatial material profiles, we discuss the optimization of performance parameters like the electrical power Pel and the efficiency η of a graded thermogenerator element of fixed length and fixed boundary temperatures. The results are compared with the constant properties model, i.e., physically and chemically homogeneous material, as a suitable reference for performance evaluation.

Keywords

thermoelectricity
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 15: Focus Issue: Advances in Thermoelectric Materials , 14 August 2011 , pp. 1963 - 1974
Copyright
Copyright © Materials Research Society 2011

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