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Counterintuitive example on relation between ZT and thermoelectric efficiency

Ryu, Byungki and Chung, Jaywan and Choi, Eun-Ae and Ziolkowski, P. and Müller, Eckhard and Park, Su Dong (2020) Counterintuitive example on relation between ZT and thermoelectric efficiency. Applied Physics Letters, 116 (193903). American Institute of Physics (AIP). doi: 10.1063/5.0003749. ISSN 0003-6951.

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Abstract

The thermoelectric figure of merit ZT, which is defined using electrical conductivity, Seebeck coefficient, thermal conductivity, and absolute temperature T, has been widely used as a simple estimator of the conversion efficiency of a thermoelectric heat engine. When material properties are constant or slowly varying with T, a higher ZT ensures a higher maximum conversion efficiency of thermoelectric materials. However, as material properties can vary strongly with T, efficiency predictions based on ZT can be inaccurate, especially for widetemperature applications. Moreover, although ZT values continue to increase, there has been no investigation of the relationship between ZT and the efficiency in the higher ZT regime. In this paper, we report a counterintuitive situation by comparing two materials: although one material has a higher ZT value over the whole operating temperature range, its maximum conversion efficiency is smaller than that of the other. This indicates that, for material comparisons, the evaluation of exact efficiencies as opposed to a simple comparison of ZTs is necessary in certain cases.

Item URL in elib:https://elib.dlr.de/137183/
Document Type:Article
Title:Counterintuitive example on relation between ZT and thermoelectric efficiency
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Ryu, ByungkiEnergy Conversion Research Center, Electrical Materials Research Division, Korea Electrotechnology Research Institute (KERI), Changwon, KoreaUNSPECIFIED
Chung, JaywanEnergy Conversion Research Center, Electrical Materials Research Division, Korea Electrotechnology Research Institute (KERI), Changwon, KoreaUNSPECIFIED
Choi, Eun-AeComputational Materials Department, Materials Processing Innovation Research Division, Korea Institute of Materials Science (KIMS), Changwon, KoreaUNSPECIFIED
Ziolkowski, P.German Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Müller, EckhardInstitute of Materials Research, German Aerospace Center (DLR), Institute of Materials Research – Thermoelectric Materials and Systems, 51147 Köln Porz-Wahnheide, Linder Höhe, Germany and Justus Liebig University Giessen, Institute of Inorganic and AnalytUNSPECIFIED
Park, Su DongEnergy Conversion Research Center, Electrical Materials Research Division, Korea Electrotechnology Research Institute (KERI), Changwon, KoreaUNSPECIFIED
Date:13 May 2020
Journal or Publication Title:Applied Physics Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:116
DOI :10.1063/5.0003749
Publisher:American Institute of Physics (AIP)
ISSN:0003-6951
Status:Published
Keywords:Counterintuitive example, ZT, Thermoelectric efficiency
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Frank, Adina
Deposited On:06 Nov 2020 10:30
Last Modified:13 May 2021 03:00

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