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• 氷点下温度域におけるクラスレートハイドレートの相平衡条件と結晶構造

  2015年03月 

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• Thermophysical Properties of Clathrate Hydrates with Various Guests for Novel Technologies: A Review

  Keita Yasuda, Ryo Ohmura

  International Journal of Thermophysics ( Springer Nature )  45   139   2024年10月 [ 査読有り ]

  掲載種別: 研究論文（学術雑誌）

  　概要を見る

  Thermophysical properties relevant to clathrate hydrate-based technologies were reviewed. Clathrate hydrates are solids composed of water and guests. The clathrate hydrate-based technologies considered in this study were as follows: carbon capture, utilization, and sequestration; natural gas storage and transportation; ozone storage and transportation; carbon dioxide clathrate hydrate as food; desalination and salt production; separation of tritiated water; cold thermal energy storage; and heat pumps and heat engines. The review was based on the experimentally measured data. The reviewed thermophysical properties were phase equilibrium conditions, formation/decomposition enthalpy, heat capacity, thermal conductivity, interfacial tension, and density. The phase equilibrium conditions determine the operating conditions for the clathrate hydrate-based technologies. The formation/decomposition enthalpy, heat capacity, and thermal conductivity relate to the thermal energy exchange during hydrate formation/decomposition. The interfacial tension is a key parameter when considering the multiphase flow composed of water and guests. The density influences the behavior of clathrate hydrates within the reactor. The relevance between these properties and the clathrate hydrate-based technologies was discussed. The methods correlating the phase equilibrium conditions were also compared in terms of applicability and usefulness. It was revealed that the suitability of the model, which is based on the Clausius–Clapeyron equation or statistical thermodynamic modeling, depends on the purpose of the correlation. Future perspectives of the thermophysical properties of clathrate hydrates were also discussed.

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• Carbon Dioxide Clathrate Hydrate Formation and Mass Balance Calculation: A Laboratory Experiment

  Keita Yasuda, Izuru Senaha

  Journal of Chemical Education ( ACS Publications )  101   3969 - 3974   2024年09月 [ 査読有り ]

  掲載種別: 研究論文（学術雑誌）

  　概要を見る

  Clathrate hydrates are attractive materials for education because they form from water and familiar compounds, such as carbon dioxide, and are relevant to novel technologies. In this study, an attempt to propose a laboratory experiment was summarized, which used carbon dioxide clathrate hydrate as an educational material with carbon capture technologies as the background of the experiment. The experiment was provided from October 2020 to August 2022 in the “Laboratory Experiments in Energy and Environment Engineering” class for second- and third-year undergraduate students. A total of 90 students, divided into 14 groups and 28 subgroups, performed the experiment. The carbon dioxide clathrate hydrate was formed under low-temperature and high-pressure conditions. Based on the measured temperature and pressure conditions, the amount of formed carbon dioxide clathrate hydrate was calculated as exercise problems. In addition to the exercise problems, the students submitted a report describing the experiments and related discussions. 92% of the students passed the required score to earn the credit for the class. The average score for those who passed the class was 84%. The educational effect was discussed based on the content of the exercise problems and reports. A stirring device to enhance the clathrate hydrate formation was designed and constructed by two students enrolled in “Project Management Practice” for fourth-year undergraduate students. They obtained a 100% score because they successfully constructed the device based on a project management method. The device was used in a laboratory experiment.

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• Mist cooling lithium–ion battery thermal management system for hybrid electric vehicles

  Aoto Teranishi, Takuma Kurogi, Izuru Senaha, Shoichi Matsuda, Keita Yasuda

  Applied Energy ( Elservier )  364   123214   2024年06月 [ 査読有り ]

  掲載種別: 研究論文（学術雑誌）

  　概要を見る

  Battery Thermal Management System (BTSM) is essential for maintaining optimal operation conditions for hybrid electric vehicles (HEVs) and electric vehicles (EVs). This study aimed to propose an innovative impinging jet cooling BTMS for HEVs using mist cooling. The dilute mist completely evaporated to avoid the risk of external circuit failure or corrosion that could result from surface wetting. Impinging experiments were performed under the conditions where inflow air temperature, Ta,in, was 21.2 ◦C ≤ Ta,in ≤ 31.0 ◦C and initial humidity, φ, was 50.9 %RH ≤ φ ≤ 96.0 %RH. It was found that the target plate was cooled down by up to 0.8 K without surface wetting by adding 5.5 mg/s water mist to the air. Numerical analyses were performed under conditions ranging from 21.2 ◦C ≤ Ta,in ≤ 31.0 ◦C and 0.0 %RH ≤ φ ≤ 100.0 %RH. The results and discussion highlight the importance of the critical initial humidity, φcritical: the complete evaporative threshold. Deviation between the experimental and numerical results at a fixed inflow air temperature, Δφ, was 1.9 %RH ≤ Δφ ≤ 3.0 %RH. Δφ was within the range of measurement uncertainty U(φ) = 4.0 %RH. Thus, the experimental and numerical results were consistent within the experimental measurement uncertainty. As a result, φcritical tends to be high in the case of high inflow temperature. The mist cooling is a viable way of BTMS for HEVs without surface wetting due to its large cooling capacity that results in a 7.4 K cooling effect in a hot environment.

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• ガスハイドレートによる海水淡水化

  安田　啓太

  日本エネルギー学会機関誌 えねるみくす ( 日本エネルギー学会 )  103   159 - 165   2024年03月 [ 査読有り ]

  掲載種別: 研究論文（学術雑誌）

• Phase equilibrium conditions in carbon dioxide + cyclopentane double clathrate hydrate forming system coexisting with sodium chloride aqueous solution

  Kouki Mekaru, Takuto Miyagi, Ayaka Mishima, Isami Uehara, Ryo Ohmura, Keita Yasuda

  Journal of Chemical Thermodynamics ( Elservier )  189   107185   2024年02月 [ 査読有り ]

  掲載種別: 研究論文（学術雑誌）

  　概要を見る

  The four-phase equilibrium conditions were measured in carbon dioxide + cyclopentane double clathrate hydrate forming systems coexisting with either sodium chloride aqueous solution or pure water as a technological basis for developing seawater desalination technology utilizing clathrate hydrate formation and decomposition. The equilibrated phases included sodium chloride aqueous solution or pure water, carbon dioxide + cyclopentane double clathrate hydrate, liquid cyclopentane, and carbon dioxide gas. The experiments were performed using the batch isochoric procedure. Three different concentrations of sodium chloride in the aqueous solution were tested: 0.035, 0.070, or 0.105 in mass fraction. Pressures ranged from 0.385 MPa to 2.488 MPa. The results were compared with the equilibrium conditions for carbon dioxide and cyclopentane simple clathrate hydrate forming systems. The comparison revealed that the double clathrate hydrate is more thermodynamically stable than the simple clathrate hydrates, under a given sodium chloride concentration in the aqueous solution.

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• Phase Equilibrium Conditions in Carbon Dioxide + Cyclopentane Double Clathrate Hydrate Forming System for Development of Seawater Desalination Technology

  Hideya Suzuki, Kouki Mekaru, Takuto Miyagi, Ayaka Mishima, Isami Uehara, Keita Yasuda

  2024 6th International Conference on Resources and Environmental Research     XG6002-A   2024年12月  [査読有り]

   

• Phase Equilibrium Condition Measurements for Dual-Functional Technology of Clathrate Hydrate-Based Seawater Desalination and Carbon Capture

  Toshikazu Sasaki, Kouki Mekaru, Toru Kubonaka, Shosei Morizumi, Keita Yasuda

  2024 6th International Conference on Resources and Environmental Research     XG6004-A   2024年12月  [査読有り]

   

• Interfacial Tension Measurements in Carbon Dioxide and Seawater System: An Implication for Clathrate Hydrate-Based Seawater Desalination

  Shun Tsunekawa, Suzuna Yamaguchi, Kazuma Ishikawa, Ayushman Tripathi, Keita Yasuda

  2024 6th International Conference on Resources and Environmental Research     XG6003-A   2024年12月  [査読有り]

   

• リチウム水溶液濃縮のための二酸化炭素クラスレートハイドレート生成系の相平衡条件測定

  長嶺 圭恭, 鈴木 秀弥, 織田 美音, 川下 宜郎, 久保田 浩, 安田 啓太

  第65回電池討論会     2024年11月  [査読有り]

   

• クラスレートハイドレートを用いたリチウム水溶液濃縮技術の開発

  大石 愛仁, 恒川 隼, 川下 宜郎, 久保田 浩, 安田 啓

  第65回電池討論会     2024年11月  [査読有り]

   

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• 蒸発潜熱を利用した冷却装置、ミスト噴霧量制御方法及び制御プログラム

  特願 2023-186272  (2023年10月31日)

  特許 第7529315号  (2024年07月29日)

  寺西　碧人，安田　啓太，瀬名波　出，松田　昇一

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• ハイドレート法による海水淡水化と製塩および石膏回収のゼロ・エミッション技術

  基盤研究(C)

  課題番号: 22K03948

  研究期間: 2022年04月  -  2025年03月 

  代表者: 安田　啓太 

  直接経費: 3,300,000（円）  間接経費: 990,000（円）  金額合計: 4,290,000（円）

• クラスレートハイドレート法による海水淡水化/製塩ハイブリッドシステムの開発

  若手研究

  課題番号: 19K14911

  研究期間: 2019年04月  -  2021年03月 

  代表者: 安田　啓太 

  直接経費: 3,300,000（円）  間接経費: 990,000（円）  金額合計: 4,290,000（円）

• クラスレートハイドレート法による海水淡水化技術の開発

  若手研究(B)

  課題番号: 17K14604

  研究期間: 2017年04月  -  2019年03月 

  代表者: 安田　啓太 

  直接経費: 3,300,000（円）  間接経費: 990,000（円）  金額合計: 4,290,000（円）

• 氷点下温度域におけるクラスレート水和物　－相平衡条件測定と結晶構造解析ー

  特別研究員奨励費

  課題番号: 10J03623

  研究期間: 2010年04月  -  2012年03月 

  代表者: 安田　啓太 

  直接経費: 1,400,000（円）  間接経費: 0（円）  金額合計: 1,400,000（円）

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