研究者データベース

沖中 憲之(オキナカ ノリユキ)
工学研究院 附属エネルギー・マテリアル融合領域研究センター 光・熱エネルギー変換材料分野
准教授

基本情報

所属

  • 工学研究院 附属エネルギー・マテリアル融合領域研究センター 光・熱エネルギー変換材料分野

職名

  • 准教授

学位

  • 博士(工学)(北海道大学)

ホームページURL

J-Global ID

研究キーワード

  • エネルギーシステム   水素吸蔵   相変化物質   潜熱蓄熱   熱電発電   燃焼合成   エネルギーメディア   Energy Media   

研究分野

  • ナノテク・材料 / エネルギー化学
  • エネルギー / 原子力工学
  • フロンティア(航空・船舶) / 航空宇宙工学

研究活動情報

論文

  • Ryo Fukahori, Takahiro Nomura, Chunyu Zhu, Nan Sheng, Noriyuki Okinaka, Tomohiro Akiyama
    APPLIED ENERGY 170 324 - 328 2016年05月 [査読有り][通常論文]
     
    High-temperature heat storage is of growing importance for advanced solar energy utilization and waste heat recovery systems. Latent heat storage technology using alloys as phase change materials (PCM) is a promising option since it can achieve a thermal energy storage system with high heat storage density and high heat exchange rate because of the large latent heat and high thermal conductivity of metallic PCMs. Encapsulation of PCM is essential for its successful use, however, the encapsulation is very difficult owing to the high corrosivity of the metallic PCM and its volume expansion during the solid-liquid phase change. So far, the technology for encapsulating metallic PCMs has not been achieved. This study proposes the use of ceramic containers comprising a cap and a cup for macro-encapsulation of metallic PCMs, and a sealing method of the containers to endure the thermal stress from volume expansion during the phase change. The resulting PCM capsule has excellent corrosive resistance and cycling performance. (C) 2016 Elsevier Ltd. All rights reserved.
  • Ryo Fukahori, Takahiro Nomura, Chunyu Zhu, Nan Sheng, Noriyuki Okinaka, Tomohiro Akiyama
    APPLIED ENERGY 163 1 - 8 2016年02月 [査読有り][通常論文]
     
    This study reports the thermal analysis of Al-Si alloys as candidate high-temperature phase-change materials (PCM) for temperatures above 500 degrees C and the corrosion behavior of the alloys with ceramic materials. Four Al-Si alloys with different Si contents (0-25 wt%) were selected as PCMs. Engineering ceramics such as Al2O3, AIN, Si3N4, SiC, and SiO2 were used for corrosion tests. Thermal analysis showed that the Al-Si alloys were better than conventional molten salts as PCM candidates because of the high heat storage capacity and high thermal conductivity of the alloys. The corrosion tests revealed that Al2O3, AIN, and Si3N4 showed high corrosion resistance to molten Al-Si alloys; therefore, these ceramics were suitable as structural materials for a latent heat storage (LHS) system using Al-Si alloys. These results demonstrate the feasibility of high-temperature LHS systems using Al-Si alloys as the PCMs and ceramics as structural materials. (C) 2015 Elsevier Ltd. All rights reserved.
  • Masaya Deguchi, Naoto Yasuda, Chunyu Zhu, Noriyuki Okinaka, Tomohiro Akiyama
    JOURNAL OF ALLOYS AND COMPOUNDS 622 102 - 107 2015年02月 [査読有り][通常論文]
     
    This paper describes a new method for producing TiFe hydrogen storage alloy through combustion synthesis by utilizing the magnesiothermic reduction reaction. The reaction mechanism and the effects of a gaseous atmosphere and pressure on the purity of TiFe products and their hydrogen storage properties were examined in this study. In the experiments, Fe, TiO2, and Mg were used as raw materials and were mixed in a molar ratio of 1:1:4. The mixture was compacted and then heated in a normal or pressurized atmosphere of hydrogen and argon. Temperature changes with time were measured, and the obtained results indicated that the melting of magnesium triggered the reaction. X-ray diffraction analysis revealed that highly pure TiFe could be synthesized in a pressurized atmosphere, containing both hydrogen and argon. The products synthesized in such a pressurized atmosphere stored approximately 1.0 mass% hydrogen and indicated flat plateaus. The process proposed in this study showed the possibility of being a new attractive production method for TiFe hydrogen storage alloy. (C) 2014 Elsevier B.V. All rights reserved.
  • Hosokai, Sou, Matsui, Kosuke, Okinaka, Noriyuki, Ohno, Ko-ichiro, Shimizu, Masakata, Akiyama, Tomohiro
    ENERGY & FUELS 26 12 7274 - 7279 2012年12月 [査読有り][通常論文]
     
    This work describes a new biomass ironmaking that uses low-grade iron ore and woody biomass for promoting the direct reduction of a nanoporous iron ore infiltrated and carbonized with biomass tar (biotar). The mechanism and kinetics of the reduction reaction of the carbon-infiltrated ore were systematically studied by means of thermogravimetric analysis with X-ray diffraction (XRD) and Raman scattering spectrometry. The results showed that the carbon-infiltrated ore reduced at a significantly lower temperature than the mixture of reagent magnetite and metallurgical coke. It was confirmed that this high reactivity was due to the nanoscale contact between carbon and the ore and the less fused and less cross-linked nature of the biotar-derived carbon. From the combination of thermogravimetry and XRD analyses, it is revealed that the reduction reaction occurred serially in three steps: re-evaporation and/or carbonization of biotar, reduction of magnetite to wustite, and reduction of wustite to iron. Finally, the kinetic parameters for each reaction were summarized by the Friedman-Ozawa method.

教育活動情報

主要な担当授業

  • エネルギー変換マテリアル学特論
    開講年度 : 2021年
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : エネルギー変換,エネルギー貯蔵,エクセルギー,LCA, 環境調和型システム
  • エネルギー変換マテリアル学特論
    開講年度 : 2021年
    課程区分 : 修士課程
    開講学部 : 工学院
  • 材料科学特論
    開講年度 : 2021年
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : Basics of Materials Science, especially Thermodynamics, Structure, Phase, Microstructure, Elastic and plastic deformation, and Physical property of materials
  • エネルギー変換マテリアル学特論
    開講年度 : 2021年
    課程区分 : 博士後期課程
    開講学部 : 工学院
    キーワード : エネルギー変換,エネルギー貯蔵,エクセルギー,LCA, 環境調和型システム
  • エネルギー変換マテリアル学特論
    開講年度 : 2021年
    課程区分 : 博士後期課程
    開講学部 : 工学院
  • 材料科学特論
    開講年度 : 2021年
    課程区分 : 博士後期課程
    開講学部 : 工学院
    キーワード : Basics of Materials Science, especially Thermodynamics, Structure, Phase, Microstructure, Elastic and plastic deformation, and Physical property of materials
  • 情報学 Ⅰ
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 情報活用,情報社会,情報科学,プログラミング,データサイエンス
  • 金属加工学
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 鋳造,粉体成型,接合,塑性加工
  • エネルギー材料工学
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : エネルギー,エネルギー変換材料,発電材料,光エネルギー変換材料,エネルギーシステム設計
  • 材料科学基礎英語
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 材料科学,英語,listening,プレゼンテーション


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