Power generation of the touching Cu/Bi-Te/Cu composites under the periodically alternating temperature gradients |
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Authors: | Osamu Yamashita Hirotaka Odahara Takahiro Ochi |
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Affiliation: | (1) Materials Science, Co., Ltd, 5-5-44, Minamikasugaoka, Ibaraki, Osaka 567-0046, Japan;(2) Advanced Materials, Co., Ltd, 4-6-10, Kizuri, Higashiosaka, Osaka 577-0827, Japan;(3) Faculty of Engineering, Ehime University, Bunkyocho, Matsuyama 790-8577, Japan |
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Abstract: | The thermo-emf ΔV of the touching p- and n-type Cu/Bi-Te/Cu composites with different thicknesses of t
Bi-Te and t
Cu was measured as a function of time by alternating the temperature difference ΔT at periods of T = 20, 60, 120, 240 and ∞ sec, where t
Bi-Te was varied from 0.1 to 2.0 mm and t
Cu from 0 to 4.0 mm. As a result, ΔV changes significantly with t
Bi-Te, t
Cu and T. The effective thermo-emf ΔV
eff increases significantly with an increase of 1/T and exhibited a local maximum at 1/T = 1/240 s−1. The resultant | α | and the effective temperature difference ΔT
eff were increased significantly by optimizing t
Bi-Te and t
Cu at 1/T = 1/240 s−1. The power generation ΔW
eff (= ΔV
eff2/4R
calc) estimated using the measured ΔV
eff and calculated R
calc also exhibited a local maximum at 1/240 s−1 for an optimum combination of t
Bi-Te = 0.1 mm and t
Cu = 2.0 mm, so that the maxima ΔW
eff at 1/T = 1/240 s−1 for the p- and n-type composites were 2.28 and 2.92 times higher than those obtained at 1/T = 0 s−1. This significant increase in ΔW
eff is owing to both the increase in ΔT
eff and the increase in ZT due to the increase in |α|. The power generation was thus found to be enhanced significantly by imposing the alternating
temperature gradients on touching Cu/Bi-Te/Cu composites. |
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Keywords: | |
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