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Numerical performance estimation of segmented thermoelectric elements

Müller, Eckhard and Walczak, Steven and Seifert, Wolfgang and Stiewe, Christian and Karpinski, Gabriele (2005) Numerical performance estimation of segmented thermoelectric elements. In: Proc. 24th Int. Conf. on Thermoelectrics (ICT 2005), pp. 352-357. Institute of Electrical and Electronics Engineers, Inc.. ICT 2005 - 24th Int. Conf. on Thermoelectrics, 2005-06-19 - 2005-06-23, Clemson, SC (USA). ISBN 0-7803-9552-1. ISSN 1094-2734.

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Functionally graded and segmented thermoelements have been considered for long, aiming at improving the performance of thermogenerators (TEG) which are exposed to a large temperature difference. A numerical algorithm has been previously developed using the software MATHEMATICA and has been applied for modelling homogeneous and segmented Peltier elements. It is capable to calculate the exact temperature profile along a segmented element in a one-dimensional model. The algorithm is based on the constant properties assumption (CPA) in each of the segments and is also providing the opportunity of treating quasi-continuous gradients. Integral quantities like the voltage drop over the element and performance parameters like cooling power and C.O.P. (for a Peltier cooler) or output power and efficiency (for a TEG) are deduced taking into account the real temperature dependence of the materials properties. This algorithm was inserted in a loop (varying the current density) to determine optimum operation parameters at given temperature difference. Numerical parameter studies based on quasi-continuously graded elements, CPA in each of the segments, and preassuming constant volume average of the figure of merit over the whole element ZT provide guidelines for advantageous TE gradients in Peltier coolers and TEG. A practical example is illustrating the quantitative improvement of performance achievable by segmentation of a Peltier cooler.

Item URL in elib:https://elib.dlr.de/21416/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Numerical performance estimation of segmented thermoelectric elements
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Walczak, StevenUniv. Halle (Saale)UNSPECIFIED
Seifert, WolfgangUniv. Halle (Saale)UNSPECIFIED
Date:November 2005
Journal or Publication Title:Proc. 24th Int. Conf. on Thermoelectrics (ICT 2005)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 352-357
EditorsEmailEditor's ORCID iD
Publisher:Institute of Electrical and Electronics Engineers, Inc.
Keywords:thermoelectric devices, modelling, thermogenerator, efficiency, power, Peltier cooler, COP, cooling power, segmented, bismuth telluride, thermoelectric material, Seebeck coefficient, electrical conductivity, thermal conductivity
Event Title:ICT 2005 - 24th Int. Conf. on Thermoelectrics
Event Location:Clemson, SC (USA)
Event Type:international Conference
Event Dates:2005-06-19 - 2005-06-23
Organizer:Clemson University, Dept. of Physics and Astronomy
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation Methods (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Structural and Functional Ceramics
Deposited By: Müller, Dr.phys. Wolf Eckhard
Deposited On:23 Jan 2006
Last Modified:27 Apr 2009 04:55

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