ピンボール 木の豆ミックス2

Journal of the Hydrogen Energy Systems Society of Japan
Online ISSN : 2436-5599
Print ISSN : 1341-6995
Volume 44, Issue 4
Displaying 1-15 of 15 articles from this issue
  • [in Japanese]
    2018 Volume 44 Issue 4 Pages 221-222
    Published: May 28, 2018
    Released on J-STAGE: November 18, 2023
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  • Yasumasa Fujii
    2018 Volume 44 Issue 4 Pages 223-229
    Published: May 28, 2018
    Released on J-STAGE: November 18, 2023
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    This paper aims to introduce the summaries of two of the feasibility studies on the extensive uses of hydrogen energy for power systems. The first study is related to hydrogen produced in Japan by water electrolysis using surplus power from variable renewable energy such as solar and wind energy. In the study, the optimal capacities and operations of hydrogen related technologies under various future case settings are evaluated with an optimal power generation mix model of 10-minute time resolution for specific regions. The second study evaluates the possibility of hydrogen which is produced of overseas low-carbon energy supplies such as coal gasification with CCS, and is transported internationally over long distance by ship or pipeline. The evaluation was conducted with a geographically disaggregated global energy supply and demand model. The results of the two studies introduced here suggest that it is necessary to make significant cost reductions of hydrogen related technologies, such as a water splitter and a high pressure storage tank, and also to target stringent CO2 emissions reduction from fossil fuel burnings, in order to expand the use of hydrogen as economically rational fuel for electric power systems.

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  • Takuya HASEGAWA
    2018 Volume 44 Issue 4 Pages 230-237
    Published: May 28, 2018
    Released on J-STAGE: November 18, 2023
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    A fossil energy society that has prospered for over a century is now required to be replaced by a renewable energy society. To maximize renewable energy and minimize costs, we need to develop massive storage methods that make it possible to convert the intermittent supply of these energy sources into reliable assets. However, our goals are extremely high and, despite great efforts, an incremental approach which we are based on may be neither practical nor efficient. Because it may include intangible restrictions which has been generated in the current paradigm started in the 19th century. This paper is a preliminary study that attempts to redesign the approach from a scratch, by providing a different perspective based on the dogma of the 17th century scientific philosophy which has been created to develop a reliable and efficient modern science.

    From a view point of the Management of Technology, not only reasons why and how the innovation stagnation can occur, but also a back-casting approach has been implemented in successful paradigm shift cases in the past. A preliminary result regarding the cost per energy of the long-term renewable energy storage systems was shown.

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  • Michihisa Koyama
    2018 Volume 44 Issue 4 Pages 238-244
    Published: May 28, 2018
    Released on J-STAGE: November 18, 2023
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    The use of renewable energy as a main primary energy source can be perceived as a common target of all the countries in the world to reach a sustainable society late in this century. Toward the sustainable goal, the photovoltaic and wind power generations are expected to play important roles in the coming decades. To counter the intermittency of their power outputs, economically feasible energy storage measures are necessary. In this article, a shifting paradigm of primary energy sources is first discussed on the basis of the breakdown of the levelized cost of electricity. Then, the economic rationality of hydrogen energy as a storage measure for intermittent renewable energies is discussed. Finally, the integration of the battery with hydrogen production from solar energy is introduced as an example to harmonically use the battery and hydrogen energy systems, which will lead to an economically viable hydrogen

    production from solar energy.

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  • Kiyoshi Kanamura
    2018 Volume 44 Issue 4 Pages 245-248
    Published: May 28, 2018
    Released on J-STAGE: November 18, 2023
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    A production of CO2 emission has to be reduced to solve global warming problem. There are several ideas for the reduction of CO2 from industries, vehicles, homes and so on. Both rechargeable battery and hydrogen energy systems are promising technologies to reduce the production of CO2. The development of new energy social system will be constructed by using these green technologies. Here, the energy grid system with rechargeable battery and that with hydrogen energy are compared based on CO2 life cycle assessment. Especially, electric vehicles (battery electric vehicle) and fuel cell vehicle are compared to discuss a next generation energy grid system for future green society with very low CO2 emission.

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  • Morihiro Saito
    2018 Volume 44 Issue 4 Pages 249-255
    Published: May 28, 2018
    Released on J-STAGE: November 18, 2023
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    Abstract: Recent research projects for next-generation batteries were overviewed and their prospects and challenges were summarized especially focused on non-aqueous Li-air battery. The new technologies and developments related on the air electrode catalysts, electrolytes and Li metal anodes were introduced and discussed for the sustainable energy society.

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  • Koji Matsuoka, Kota Miyoshi, Yasushi Sato
    2018 Volume 44 Issue 4 Pages 256-260
    Published: May 28, 2018
    Released on J-STAGE: November 18, 2023
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    Toluene-methylcyclohexane system is one of the most promising system for hydrogen carrier. It can store larger amounts of hydrogen than high-pressure gas cylinders or liquid hydrogen. Toluene and methylcyclohexane (MCH) are both liquids at room temperature, have low toxicity and are chemically stable for long time. We proposed a new process for using electrochemical reduction of toluene (Direct MCH). Direct MCH is simplest way to produce MCH using renewable energy, that shows higher efficiency and lower cost than those of conventional method. In addition, we demonstrated the production of MCHu sing Direct MCH with 100% solar power in Australia and transportation of hydrogen to Japan in 2019. It was the first demonstration in the world using this method, and we could get 2,200 NL of hydrogen in Japan.

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  • [in Japanese]
    2018 Volume 44 Issue 4 Pages 264-265
    Published: May 28, 2018
    Released on J-STAGE: November 18, 2023
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  • [in Japanese]
    2018 Volume 44 Issue 4 Pages 266-267
    Published: May 28, 2018
    Released on J-STAGE: November 18, 2023
    DOI
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  • [in Japanese]
    2018 Volume 44 Issue 4 Pages 268-269
    Published: May 28, 2018
    Released on J-STAGE: November 18, 2023
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    Download PDF (2096K)
  • 2018 Volume 44 Issue 4 Pages 270-271
    Published: May 28, 2018
    Released on J-STAGE: November 18, 2023
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  • 2018 Volume 44 Issue 4 Pages 272-279
    Published: May 28, 2018
    Released on J-STAGE: November 18, 2023
    DOI
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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  • 2018 Volume 44 Issue 4 Pages 280
    Published: May 28, 2018
    Released on J-STAGE: November 18, 2023
    DOI
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
    Download PDF (269K)
  • 2018 Volume 44 Issue 4 Pages 281
    Published: May 28, 2018
    Released on J-STAGE: November 18, 2023
    DOI
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