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 34, Issue 4
Displaying 1-12 of 12 articles from this issue
  • [in Japanese]
    2009 Volume 34 Issue 4 Pages 1
    Published: 2009
    Released on J-STAGE: July 21, 2022
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  • Ko Sakata
    2009 Volume 34 Issue 4 Pages 2-3
    Published: 2009
    Released on J-STAGE: July 21, 2022
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    The present status of the energy issue has various challenges including global warming resulted from anthropologenic carbon emission. To achieve low carbon energy systems, one of the target areas is the transportation sector, where fossil fuels are almost exclusively used. Since fuel cell vehicles are considered a promising option, RD&D on fuel cells and hydrogen supply infrastructure have been extensively conducted where compressed hydrogen gas technology play an important role. In the following articles, the latest information and prospects are presented.

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  • Yasuyuki Takata, Naoya Sakoda, Kan’ei Shinzato, Motoo Fujii
    2009 Volume 34 Issue 4 Pages 4-10
    Published: 2009
    Released on J-STAGE: July 21, 2022
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    Studies on hydrogen thermophysical properties at high pressure have been performed. The properties being measured are the PVT relation, viscosity, thermal conductivity, solubility in water and others. The present paper introduces the measurement systems especially equipped for high pressures and some results are shown. The Burnett method was used to measure the PVT relation in the range up to 100 MPa and up to 473 K. The obtained PVT data agree well with the existing EOS in the low pressure range, while for the density at 100 MPa and 473 K the EOS deviates by 0.7% from the measurements. The capillary method was used to measure viscosity and the measured results below 8 MPa roughly agree with those predicted by Chapman-Enskog theory. The transient short-hot wire (TSHW) method was adopted for measuring thermal conductivity and thermal diffusivity. By coupling with a numerical analysis, it was found that the TSHW method can effectively be applied to the measurement of hydrogen thermal conductivity. The measured thermal conductivity showed fairly good agreement with the literature within±1% at pressure range less than 0.3 MPa. A measurement system for the solubility ofhydrogen in water was developed and the results at 298 K and below 29 MPa agree well with previously reported data.

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  • Saburo MATSUOKA
    2009 Volume 34 Issue 4 Pages 11-23
    Published: 2009
    Released on J-STAGE: July 21, 2022
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    Research and development of hydrogen energy systems such as fuel cell vehicles and hydrogen energy infrastructures such as hydrogen stations are advanced as one of the strong means to solve global environmental concerns. In 2006, ‘HYDROGENIUS (the Research Center for Hvdrogen Industrial Use and storage)’ was founded in AIST to investigate the basic mechanism of hydrogen embrittlement and to establish the guideline of safe utilization of materials with hydrogen. In this report, the results obtained by the Hydrogen Fatigue and Fracture Team in HYDROGENIUS in three years between 2006 and 2008, especially the hydrogen entry properties, tensile properties and fatigue crack growth properties are reported, taking account to the clarification of the basic mechanism of hydrogen embrittlement.

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  • Yuichi KOKUBUN
    2009 Volume 34 Issue 4 Pages 24-30
    Published: 2009
    Released on J-STAGE: July 21, 2022
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    In Japan, the project to set up infrastructure necessary for the supply of hydrogen to Fuel Cell Vehicle (FCV) is moving forward, targeting to start up in 2015. Since supply cost of hydrogen is relatively higher than that gasoline as of today, persistent efforts to achieve cost reduction is required for further spread of FCV. We performed a feasibility study of hydrogen supply in the off-site type hydrogen station under the commission of New Energy and Industrial Development Organization (NEDO), and report the outcome of study.

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  • Stanislaw M. FILIPEK, Ryutaro SATO, Rafal WIERZBICKI, Iryna MARCHUK
    2009 Volume 34 Issue 4 Pages 31-37
    Published: 2009
    Released on J-STAGE: July 21, 2022
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    Development of high hydrogen pressure technique and its application for syntheses of hydrides of transition metals (with focus on MnH8 and hydrides of Ni-based alloys) and hydrides of Laves phase alloys have been briefly reviewed. Experimental prove of the existence of ferromagnetic fcc Mn is given and a unique role of Mn in transformation of RMn2 Laves phase alloys into non-interstitial RMn2H6(R = Y, Er, Dy, Ho, Gd) hydrides is presented.

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  • Yoshiki Sakaguchi, Takeshi Yamamoto, Hideaki Nishiwaki
    2009 Volume 34 Issue 4 Pages 39-45
    Published: 2009
    Released on J-STAGE: July 21, 2022
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    Fuel cell vehicles (FCV) have great expectations to help realize a low carbon society. In July 2008, the basic scenarios to utilize FCV were produced by the Fuel Cell Commercialization Conference of Japan (FCCJ). This utilization scenario set the date for initial FCV commercialization to start from 2015, and agreement for this plan was reached between major automobile manufacturers and energy suppliers. Now, most of on board hydrogen storage systems use over-wrapped composite type 3 or type 4 high pressure cylinders. These storage systems still have many features to improve, especially volume efficiency and cost optimization.

    This paper presents the recent activities to improve the performance of hydrogen storage systems with aluminum-lined type 3, over-wrapped composite cylinders – utilization of a high strength aluminum alloy , and a hybrid system with composite over-wrap combined with metal hydride storage of hydrogen.

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  • Daigoro Mori, Kenji Komiya, Kosei Yoshida, Norihiko Haraikawa, Shintar ...
    2009 Volume 34 Issue 4 Pages 46-51
    Published: 2009
    Released on J-STAGE: July 21, 2022
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    High-pressure metal hydride tank, a combination technology of metal hydride and high-pressure tank, is one of promising option for fuel cell vehicles. Both high storage capacity and good charge-discharge performance can be achieved by this system. 1st generation system is “CFRP High-pressure Metal Hydride Tank”. 5.3 kg hydrogen can be stored within 100 L tank with 2.5 mass% BCC alloy at 35 MPa. A separated aluminum liner is designed for this system to install a tube and fin type heat.exchanger with metal hydride powder into the tank. In a burst test, a prototype was not ruptured at 100 MPa inner-pressure. And at a pressure cycle test, there was no leak during 22,000 cycles. It is possible to secure enough strength equal to conventional CFRP high-pressure tank. 2nd generation system is “Multi-cylinder High-pressure Metal Hydride Tank”. It has a bundling structure by 10-40 metallic vessels which install hydrogen-absorbing alloy. The bundle of the vessels is also a heat exchanger. To improve thermal conductivity, hydrogen supply pressure is lowered to 10-20 MPa, which makes it possible to reduce the wall thickness of vessel. Experimental results by prototype tank and simulation results by 1/1 scale on-board tank model show that 5 kg hydrogen can be stored within 83 L tank and also that more than 80 % of hydrogen can be stored within 5 minutes if a hydrogen-absorbing alloy with 3.0 mass% effective capacity is developed.

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  • Hiroki Furuta
    2009 Volume 34 Issue 4 Pages 52-55
    Published: 2009
    Released on J-STAGE: July 21, 2022
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    The Senju hydrogen station was constructed with the JHFC Project in 2002, and filling demonstration study of hydrogen fuel to fuel-cell vehicles has been done since it was opened in May, 2003. When it comes to practical use of fuel-cell vehicles, improvement of the method of in-vehicle hydrogen storage and increasing mileage (cruising range) are the key matters. Several 70MPa demonstration projects are running abroad because the in-vehicle hydrogen storage of 70MPa is one of the effective means to increase hydrogen load capacity, and to extend the cruising range. In these circumstances, 70MPa demonstration test has been decided to carry out at the JHFC hydrogen stations with filling equipment of 70MPa in addition to the conventional filling equipment of 35MPa. The 70MPa equipment at The Senju hydrogen station was completed in September 2008 as the first one in Japan, and this brief report introduces the outline of the equipment and the demonstration study.

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  • Keigo YASUDA and, Shigeharu TANISHO
    2009 Volume 34 Issue 4 Pages 56-61
    Published: 2009
    Released on J-STAGE: July 21, 2022
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    Fermentative hydrogen production from artificial food waste by batch cultivation under a pH of 6.0 and a temperature of 37°C was studied by using mesophilic bacterium HN001. The aim of this study is to investigate the effect of the ratio between carbon and nitrogen concentration (C/N) and substrate concentration on hydrogen fermentation. C/N was changed from 9 to 23 by adding entrails of fish to the artificial food waste because entrails contain lots of Nitrogen. Hydrogen production rate and hydrogen yield increased from 0.3L L-culture-1 h-1 to 1.2L L-culture-1 h-1 and from 22L kg-wet-1 to 67L kg-wet-1 respectively when C/N decreased from 23 to 20. Volatile fatty acid also changed, acetate and butyrate increased and lactate decreased, by decreasing C/N. Hydrogen yield was relatively low though hydrogen production rate did not decreased when yeast extract and casamino acids were used as nutrients instead of entrails. However, it was improved by adding yeast extract, casamino acids and iron. This result indicates that entrails could be utilized as not only nitrogen source but also mineral source for hydrogen fermentation. Hydrogen productivity was also affected by substrate concentration. Hydrogen production rate increased along with the increase of substrate concentration form 100 g-wet L-1 to 300 g-wet L-1. On the other hand, hydrogen yield on 500 g-wet L-1 decreased compared with them between 100 g-wet L-1 and 300 g-wet L-1.

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  • Takeshi Takama, David Groves, James Keirstead
    2009 Volume 34 Issue 4 Pages 62-69
    Published: 2009
    Released on J-STAGE: July 21, 2022
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    This article briefly introduces a new method to analyse the future of the Japanese hydrogen energy. The development of a new economy centering on the hydrogen energy and its market has many uncertain elements. Therefore, we explain the problems of the existing analytical methods concerning uncertainties and “why a new analytical method is needed” to support policymaking.

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  • [in Japanese]
    2009 Volume 34 Issue 4 Pages 70-72
    Published: 2009
    Released on J-STAGE: July 21, 2022
    DOI
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