Journal of the Japan Institute of Energy
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ONLINE ISSN: 1882-6121
PRINT ISSN: 0916-8753

Journal of the Japan Institute of Energy Vol. 86 (2007), No. 6

  • A Systematic Analysis of Bioenergy Supply Potentials by Developing Regional Biomass Balance Tables in Japan

    pp. 403-410

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    DOI:10.3775/jie.86.403

    The purpose of this study is to conduct a systematic analysis of regional bioenergy supply potentials in Japan. For this purpose the authors developed regional biomass balance table that is a tool to grasp overall biomass flows and to evaluate discharges of biomass residues, parts of which can be used for bioenergy resources. The regional data about biomass products are available but those about the discharges of biomass residues are limited. Therefore, the authors divided the biomass balance table in the whole Japan into those in regions using both the available data of the products and the systematic biomass-balance analysis. The tables the authors developed shows the regional bioenergy potential differs greatly, and the region with the most bioenergy per capita (Hokkaido) has about three times more than the region with the least potential (Kansai).
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  • Study on Performance Evaluation and Optimization of 200kW Gas Engine Co-generation System

    pp. 411-417

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    DOI:10.3775/jie.86.411

    Recently, co-generation system (CGS) is introduced to small scale objective that heat demands changes through the year, such as household use and business place. However, as capacity of prime mover is small, the power generation efficiency becomes low. And heat-using ratio becomes low in middle season such as spring and autumn. Therefore, it is necessary to examine the influence of low capacity of prime mover and low heat to power ratio on effective use of energy. In this study, we evaluate the effective use of energy using heat quantity and exergy for 200kW gas engine cogeneration system introducing to Energy Conversion Research Center in Doshisha University. As the result, it was shown that it is necessary to optimize the heat recovery devices and the heat utilization devices for the improvement of the thermal efficiency of CGS, and to improve the power generation efficiency of prime mover for the improvement of the exergy efficiency of CGS. Moreover, the amount of primary energy use can be reduced throughout the year by introducing an absorption refrigerator of the output 210kW and a heat to power conversion system of the thermal efficiency over 10% into CGS.
    x

    Readers Who Read This Article Also Read

    1. Combustion Characteristics of Hydrogen in a Catalytic Fluidized Bed Journal of the Japan Institute of Energy Vol.86(2007), No.10
    2. Flame Characteristics in a Wick Combustion of GTL Kerosene Journal of the Japan Institute of Energy Vol.86(2007), No.10
    3. A Study on Evaluating Risk in CDM Journal of the Japan Institute of Energy Vol.86(2007), No.11

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