New evaluation parameter for wearable thermoelectric generators
Article
Article Title | New evaluation parameter for wearable thermoelectric generators |
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ERA Journal ID | 994 |
Article Category | Article |
Authors | Wijethunge, Dimuthu and Kim, Woochul |
Journal Title | Journal of Applied Physics |
Journal Citation | 123 (14) |
Article Number | 145110 |
Number of Pages | 9 |
Year | 2018 |
Publisher | AIP Publishing |
Place of Publication | United States |
ISSN | 0021-8979 |
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. |
Keywords | Semiconductors; Superlattices; Wearable technology; Thermoelectric devices; Thermoelectric generator; Thermal conductivity; Electrical resistivity; Thermodynamic states and processes; Thermoelectric effects; Thermoelectric materials |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 490299. 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 Affiliations | School of Engineering |
Yonsei University, Korea |
https://research.usq.edu.au/item/z7648/new-evaluation-parameter-for-wearable-thermoelectric-generators
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