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Design and Experimental Investigation of Thermoelectric Generators for Wearable Applications

Authors
Lee, Yun GooKim, JunsooKang, Min-SuBaek, Seung-HyubKim, Seong KeunLee, Seung-MinLee, JaewooHyun, Dow-BinJu, Byeong-KwonMoon, Seung EonKim, Jin-SangKwon, Beomjin
Issue Date
7월-2017
Publisher
WILEY
Keywords
heat sinks; thermal resistance; thermoelectric generators; wearable electronics
Citation
ADVANCED MATERIALS TECHNOLOGIES, v.2, no.7
Indexed
SCIE
SCOPUS
Journal Title
ADVANCED MATERIALS TECHNOLOGIES
Volume
2
Number
7
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/82918
DOI
10.1002/admt.201600292
ISSN
2365-709X
Abstract
A critical challenge in using thermoelectric generators (TEGs) for charging the portable or wearable electronics has been their limited outputs, as available temperature differential on human body (Delta T-ext) is typically less than 10 K. Furthermore, the thermal resistance (R-th) at the TEG-air interface often overwhelms R-th of TEG itself, which makes the temperature differential within the TEG merely a small fraction of Delta T-ext. Here, the designs of TEG systems for wearable applications based both on theory and systematic experiments are studied. First, this study fabricates the TEGs having different fill factors (equivalently, varied internal R-th of the TEGs) and finds an optimum fill factor that is determined by both thermal matching condition and the electrical contact resistance. Next, to investigate the effects of heat sink and external air flow, this study combines plate fin heat sinks with the TEGs and evaluates their performance under three different convection conditions: natural convection, and convection with either parallel or impinging flow. Lastly the effect of R-th at the skin-TEG interface is studied. Although the TEG system produces an output power of 126 mu W cm(-2) (Delta T-ext = 7 K) on a smooth heat source (Cu heater), it generates reduced power of 20 mu W cm(-2) (Delta T-ext = 6 K) on wrist (uneven heat source).
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공과대학 (전기전자공학부)
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