Journal of Japan Society of Energy and Resources
Online ISSN : 2433-0531
ISSN-L : 2433-0531
Volume 31 , Issue 3
Showing 1-3 articles out of 3 articles from the selected issue
Research Paper
  • Miyoko Shimokawa, Tetsuo Tezuka
    Type: Research Paper
    2010 Volume 31 Issue 3 Pages 1-7
    Published: 2010
    Released: August 26, 2019
    JOURNALS FREE ACCESS
    "Home Energy-conservation Support Program" has been developed on the Website in this study. This Program has two purposes. From a short-term standpoint, one is to promote the residential energy-saving behavior by activating communication in a family. Another is, from a long-term standpoint, to get the information about energy consumption of the Program members, clarify the relations between the energy consumption and the family attributes, and apply them to the system design and the residential design. This paper shows the evaluation results of the Program performance through its implementation for three years.
    As for the energy-saving effect, the total energy consumption of the members was observed to be decreasing, which suggests that the Program has prompted the energy-saving behavior of the members. By using the energy consumption data, the author has estimated the energy consumption characteristics against the type of house, the size and age of family, and also demonstrated the possibility of estimating separately the age effect and cohort effect of the residential energy consumption.
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  • Susumu Uchida, Kazuyoshi Nemoto, Syogo Sugiura, Kunio Shimoda, Masahir ...
    Type: Research Paper
    2010 Volume 31 Issue 3 Pages 8-14
    Published: 2010
    Released: August 26, 2019
    JOURNALS FREE ACCESS
    Energy consumption structure of Japanese professional baseball games was analyzed. Multiple linear regression analyses of electricity consumption in stadiums indicated that the length of games, air-conditioning load (calculated from the temperature), starting time of games (day or night) and humidity affected the electricity consumption in most stadiums, and also the number of spectators and atmospheric pressure affected in some stadiums. Total electricity consumption was decomposed to each factors based on the result of the analyses. Nippon Professional Baseball had started "Green Baseball Project" in 2008, in which each player himself and team tries to save electricity through speedy play and to shorten the game length. Total electricity consumption in 2008 was reduced by 2.58% compared to 2007 and energy consumption by gas was also reduced, although the reduction ratio in the game length was no more than 1.4%. Furthermore, the degree in contribution of game length to total consumption of electricity increased in 2008. This cannot be explained by the reduction of game length, and these results suggested that some factors other than the game length also affected to the reduction of energy consumption such as the increasing awareness of players, spectators and stadium officers about energy saving, considering restricted contribution of game length to total electricity consumption.
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  • Takashi Yanagida, Shinji Fujimoto, Lyudmyla Yuriyivna Bespyatko, Seiic ...
    Type: Research Paper
    2010 Volume 31 Issue 3 Pages 15-20
    Published: 2010
    Released: August 26, 2019
    JOURNALS FREE ACCESS
    This paper focuses on the cost analysis of ethanol production from rice straw by hydrothermal pretreatment with phosphoric acid. In this case, there are economical trade-off relations such as the costs of phosphoric acid and enzyme. The purpose of this study is to clarify the economical trade-off relations and to find more economically advantageous conditions over hydrothermal pretreatment method. Under the conditions assumed here, recovery and reuse of phosphoric acid is important for the cost reduction. An increase in amount of sugar yield of 3% or more is required to obtain an advantage to use phosphoric acid during hydrothermal process.
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