Journal of Japan Society of Energy and Resources
Online ISSN : 2433-0531
ISSN-L : 2433-0531
Volume 31 , Issue 4
Showing 1-5 articles out of 5 articles from the selected issue
Research Paper
  • Shuichi Kanari, Masanobu Kii, Shigeru Suehiro
    Type: Research Paper
    2010 Volume 31 Issue 4 Pages 1-7
    Published: 2010
    Released: August 26, 2019
    JOURNALS FREE ACCESS
    We developed an analytical model for automobile technology assessment, named CEAMAT (Cost and Effectiveness Assessment Model for Automobile Technologies). In this paper, the model was demonstrated in the application of costeffectiveness analysis of the future automobile technologies. Two technology scenarios, frozen and progress, were analyzed using CEAMAT, and the technological progress was evaluated to have substantial impact on CO2 reduction, -27% compared with technology frozen scenario. However, the average reduction cost was estimated to be -11 to 24 thousands yen/ton-CO2, which is decreasing yearly from 2010 to 2050. In addition, even in the technology progress scenario, the next generation automobile technologies, like Plug-ins, EVs, or FCVs, were found to remain too expensive to diffuse. If CO2 should be reduced drastically in the middle to long term, these results imply that integrated approach including not only technological progress but also traffic flow improvement would be required.
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  • Yuko Hoshino, Taishi Sugiyama, Takahiro Ueno
    Type: Research Paper
    2010 Volume 31 Issue 4 Pages 8-14
    Published: 2010
    Released: August 26, 2019
    JOURNALS FREE ACCESS
    This report summarizes recent international transfer of CO2 emission embodied in trade in Japan, China, US and UK. In particular we focused on the period after the year 2000, when drastic changes in trade structure has taken place since BRICS countries have emerged. We estimated net imports of CO2 emission embodied in traded goods after 1991 based on aggregate data of each country, which have increased significantly after the year 2000. UK imported as much as 44%, Japan, 38%, US, 20%, respectively, of the domestic emission at 2005: meanwhile, 27% of domestic emission in China in 2004 was induced by its export. We estimated CO2 emission embodied in trade of steel industry after 1990 as a typical energy-intensive industry. In Japan and China, CO2 emission was driven by domestic production for exports. UK and the US, in contrast, increased much CO2 emission abroad by their imports. Then, we also estimated CO2 emission embodied in trade of textile industry after 1990 as a typical energy-non-intensive industry. The developed countries, Japan, the US and UK, induced more CO2 emission abroad than that emitted at home. Accordingly, in 2004, China exports 33% of domestic CO2 emission in textile industry.
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  • Tsuyoshi KITO, Yugo OSAKA, Noriyuki KOBAYASHI, Akihiro MATSUYAMA
    Type: Research Paper
    2010 Volume 31 Issue 4 Pages 15-20
    Published: 2010
    Released: August 26, 2019
    JOURNALS FREE ACCESS
    NOx emitted from diesel is one of the main air pollutants for most countries. To reduce the emission of NOx could promote to diffuse diesel vehicles. A NOx storage / reduction (NSR) catalyst has been developed for the diesels. The catalyst in NSR is strongly poisoned by sulfur. We have researched reaction characteristics of CaCO3 with sulfur dioxide by using a thermogravimetry. We obtained desulfurization breakthrough characteristic for CaCO3. As a result, packed bed reactor of CaCO3 absorbed SO2 about 0.174 g-SO2/g- CaCO3. The absorption efficiency of CaCO3 was more than 99.4%. According to this result, it was found that the necessary amount of the absorbent was supposed to be 1.40 kg or 1.68 L for 100,000 km running.
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  • Kanji Oshima, Yohji Uchiyama
    Type: Research Paper
    2010 Volume 31 Issue 4 Pages 21-26
    Published: 2010
    Released: August 26, 2019
    JOURNALS FREE ACCESS
    We propose a new closed cycle oxy-fuel gas turbine power plant that utilizes a nuclear heat generator. A pressurized water reactor (PWR) is designed to supply saturated steam to an oxy-fuel gas turbine for a specific power output increase. The saturated steam from the reactor can have lower pressure and temperature than those of an existing PWR. In this study, we estimated plant performances from a heat balance model based on a conceptual design of a hybrid plant for different inlet pressures of the gas turbine. The generating efficiency of an oxy-fuel gas turbine plant without a nuclear steam generator is estimated to be less than 35%. In contrast, the proposed plant has more than 40% of the whole generating efficiency. In the proposed plant, the power output contributed by a PWR is obtained by subtracting the LNG contribution from the whole power output. Supposing the generating efficiency of the LNG system in the proposed plant equals to that of the conventional plant, the efficiency of PWR system contributing to increase the generating performances of the proposed plant is estimated to be around 45%, even if the steam conditions are lower than in an existing PWR.
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  • Moritoshi Kato, Yicheng Zhou
    Type: Research Paper
    2010 Volume 31 Issue 4 Pages 27-34
    Published: 2010
    Released: August 26, 2019
    JOURNALS FREE ACCESS
    We focus on Japanese electricity exchange market. Currently, the 9 electric power companies in Japan carry the dominant influence as a seller side in JEPX transaction substantially. Therefore the aggregated marginal generation costs of the 9 electric power companies become major factors in the spot pricing mechanism in JEPX. Based on these facts, the fluctuation mechanism of electricity spot prices in JEPX depends on the supply side to a large extent. This paper addresses the challenge of building spot prices modeling for JEPX using a modified hybrid price model which can take not only cost-based issue but also market-based issue into consideration. The price model is decomposed into expected value part and indeterminate part. In order to represent the expected value part, we apply the Hill function, which can well fit the feature of 9 electric power companies’ aggregated marginal cost. We also apply the time series model to represent the indeterminate part. We forecast the spot prices using the model for verification of the model, and validate its good forecasting performance. Our model is suitable for the electricity exchange market in Japan.
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