研究者業績

小倉 裕直

オグラ ヒロナオ  (Hironao Ogura)

基本情報

所属
千葉大学 大学院工学研究院 教授
学位
博士(工学)(名古屋大学)

連絡先
hiro_ogurafaculty.chiba-u.jp
J-GLOBAL ID
200901000653517619
researchmap会員ID
5000023161

外部リンク

論文

 59
  • Yawen Ren, Hironao Ogura
    Energy and Buildings 313 114256 2024年6月  査読有り最終著者責任著者
  • 廣瀬 裕二, 渡邊 くるみ, 平野 優香, 小倉 裕直
    化学工学論文集 50(3) 65-70 2024年5月20日  査読有り最終著者
  • Yawen Ren, Hironao Ogura
    Energies 16(7) 3075-3075 2023年4月  査読有り招待有り最終著者責任著者
    Facing the goal of carbon neutrality, energy supply chains should be more low-carbon and flexible. A solar chemical heat pump (SCHP) is a potential system for achieving this goal. Our previous studies developed a silicone-oil-based phase-change material (PCM) mixture as a PCM fluid for enhancing heat recovery above 373 K in the solar collector (SC) of the SCHP. The PCM fluid was previously tested to confirm its dispersity and flow properties. The present study proposed a 3D computational fluid dynamics model to simulate the closed circulation loop between the SC and reactor using the PCM fluid. The recovered heat in the SC was studied using several flow rates, as well as the PCM weight fraction of the PCM fluid. Furthermore, the net transportable energy is considered to evaluate the ratio of recovered heat and relative circulation power. As a result, it was verified that the recovered heat of the SC in the experiment and simulation is consistent. The total recovered heat is improved using the PCM fluid. A lower flow rate can enhance the PCM melting mass and the recovered heat although sensible heat amount increases with the flow rate. The best flow rate was 1 L/min when the SC area is 1 m2. Furthermore, the higher PCM content has higher latent heat. On the other hand, the lower content PCM can increase the temperature difference between the SC inlet and outlet because of the lower PCM heat capacity. For the 1 L/min flow rate, 2 wt% PCM fluid has shorter heat-storing time and larger net transportable energy than 0 wt% PCM fluid (426 kJ←403 kJ) for the SCHP unit.
  • Hironari Sakamoto, Shigehisa Uchiyama, Ayana Sato, Tomohiko Isobe, Naoki Kunugita, Hironao Ogura, Shoji F. Nakayama
    International Journal of Environmental Research and Public Health 19(23) 15813-15813 2022年11月  査読有り
    Few studies have investigated personal exposure concentrations of not only some volatile organic compounds but also more types of chemicals including acidic gases and acrolein. We measured the personal exposure concentrations of 35 chemicals including these chemicals in indoor and outdoor air in Chiba-shi, Japan, for 7 days in summer and winter to assess the associated health risks in 22 people. The personal exposure concentrations of nitrogen dioxide were higher in winter than in summer, and those of formaldehyde, p-dichlorobenzene, and tetradecane were higher in summer than in winter. The personal exposure concentrations were mostly equal to or lower than the concentrations in indoor air, contrary to the results of a lot of previous studies. The high-risk chemicals based on personal exposure concentrations were identified as acrolein (max. 0.43 μg/m3), benzene (max. 3.1 μg/m3), and hexane (max. 220 μg/m3) in summer, and acrolein (max. 0.31 μg/m3), nitrogen dioxide (max. 320 μg/m3), benzene (max. 5.2 μg/m3), formic acid (max. 70 μg/m3), and hexane (max. 290 μg/m3) in winter. In addition, we estimated personal exposure concentrations according to the time spent at home and the chemical concentrations in indoor and outdoor air. We found that the estimated concentrations of some participants largely differed from the measured ones indicating that it is difficult to estimate personal exposure concentrations based on only these data.
  • Yawen REN, Hironao OGURA
    Journal of Thermal Science and Technology 17(2) 2022年5月  査読有り最終著者責任著者

MISC

 4

書籍等出版物

 2
  • 小倉裕直, 小林敬幸 (担当:分担執筆, 範囲:5.3化学蓄熱・ヒートポンプシステムの高性能化)
    日本工業出版・日本冷凍空調学会 2023年3月 (ISBN: 9784819035057)
  • 技術情報協会 (担当:共著, 範囲:第8章第2節 ケミカルヒートポンプを利用した廃熱回収システムの開発)
    技術情報協会 2020年12月 (ISBN: 9784861048197)

講演・口頭発表等

 36

共同研究・競争的資金等の研究課題

 10

産業財産権

 41