New evaluation parameter for wearable thermoelectric generators

Article


Wijethunge, Dimuthu and Kim, Woochul. 2018. "New evaluation parameter for wearable thermoelectric generators ." Journal of Applied Physics. 123 (14). https://doi.org/10.1063/1.5018762
Article Title

New evaluation parameter for wearable thermoelectric generators

ERA Journal ID994
Article CategoryArticle
AuthorsWijethunge, Dimuthu and Kim, Woochul
Journal TitleJournal of Applied Physics
Journal Citation123 (14)
Article Number145110
Number of Pages9
Year2018
PublisherAIP Publishing
Place of PublicationUnited States
ISSN0021-8979
1089-7550
Digital Object Identifier (DOI)https://doi.org/10.1063/1.5018762
Web Address (URL)https://pubs.aip.org/aip/jap/article-abstract/123/14/145110/154265/New-evaluation-parameter-for-wearable?redirectedFrom=fulltext
Abstract

Wearable devices constitute a key application area for thermoelectric devices. However, owing to new constraints in wearable applications, a few conventional device optimization techniques are not appropriate and material evaluation parameters, such as figure of merit (zT) and power factor (PF), tend to be inadequate. We illustrated the incompleteness of zT and PF by performing simulations and considering different thermoelectric materials. The results indicate a weak correlation between device performance and zT and PF. In this study, we propose a new evaluation parameter, zTwearable, which is better suited for wearable applications compared to conventional zT. Owing to size restrictions, gap filler based device optimization is extremely critical in wearable devices. With respect to the occasions in which gap fillers are used, expressions for power, effective thermal conductivity (keff), and optimum load electrical ratio (mopt) are derived. According to the new parameters, the thermal conductivity of the material has become much more critical now. The proposed new evaluation parameter, namely, zTwearable, is extremely useful in the selection of an appropriate thermoelectric material among various candidates prior to the commencement of the actual design process.

KeywordsSemiconductors; Superlattices; Wearable technology; Thermoelectric devices; Thermoelectric generator; Thermal conductivity; Electrical resistivity; Thermodynamic states and processes; Thermoelectric effects; Thermoelectric materials
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020490299. Mathematical physics not elsewhere classified
Public Notes

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in J. Appl. Phys. 123, 145110 (2018) and may be found at https://doi.org/10.1063/1.5018762.

Byline AffiliationsSchool of Engineering
Yonsei University, Korea
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