成果報告書詳細
管理番号20130000000938
タイトル*平成24年度中間年報 省エネルギー革新技術開発事業 先導研究(事前研究一体型) 自立型システムのための熱発電デバイスの研究開発
公開日2014/2/21
報告書年度2012 - 2012
委託先名パナソニック株式会社  国立大学法人大阪大学
プロジェクト番号P09015
部署名省エネルギー部
和文要約
英文要約Title: Research and Development Program for Innovative Energy Efficiency Technology / Leading Research Project (Pre-Research Combined) / Research and Development of Thermoelectric Devices for Independent Systems (FY2011-FY2013) FY2012 Annual Report
With a view to improving energy efficiency by recovering waste thermal energy from fluid heat sources, we investigated and developed thermoelectric generating devices in a tubular shape, or thermoelectric tubes. In the previous FY2011, we have developed innovative powder sintering technique called spark plasma sintering (SPS) method to realize robust BiTe/Ni laminate composites in a tubular shape, and verified power generation of 0.6 W (80 deg. C for hot water and 10 deg. C for cold water). In the following FY2012, we refined a series of fabrication processes to improve the performance of generating devices. For the powder preparation of thermoelectric BiTe, we introduced the melt-spinning process. Melt-spun BiTe powder showed good thermoelectric property (ZT ~ 0.9) compared with the previously used powder (milled ingot, ZT of 0.3 ~ 0.7). Significant enhancement in generation performance, 1.8 W per 100 mm, was confirmed with the prepared thermoelectric tube (80 deg. C for hot water and 10 deg. C for cold water). In terms of material improvement, exploiting porous Ni was found to be beneficial in the previous FY2011. In the following FY2012, we experimentally realized porous Ni by using fine-grained powder. It was found that when the mean grain size was changed from 50 um to 5 um, relative density was reduced from 92 % to 74 % in the present sintering condition (500 deg. C and 50 MPa). Calculation showed that this density reduction leads to reduction of the thermal conductivity and enhancement of power generation by a factor of 1.9. We also investigated pseudo-porous Ni/SiO2 composites with various SiO2 content and sintering conditions, aiming at reducing the thermal conductivity while maintaining the product of the thermal conductivity and the electrical resistivity. Thermal conductivity reduction was successfully achieved and confirmed 8.5 Wm-1K-1 for Ni/SiO2 composite with 10 % SiO2 (the literature value for dense Ni is 90.9 Wm-1K-1). A feasibility study of wasete heat recovery was launched at Kyoto City Northeast Clean Center, which is a waste incineration plant located in Kyoto city.
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