The Journal of the Institute of Electrical Installation Engineers of Japan
Online ISSN : 2188-6946
Print ISSN : 0910-0350
ISSN-L : 0910-0350
Volume 35 , Issue 3
Showing 1-20 articles out of 20 articles from the selected issue
  • Hidekazu Sanada, Sanshiro Yamanaka, Yuki Nishido, Hiroshi Kobayashi
    2015 Volume 35 Issue 3 Pages 204-211
    Published: 2015
    Released: March 27, 2015
    JOURNALS FREE ACCESS
    By the Feed-in Tariff in Japan enforced in July,2012,quantity of introduction to photovoltaic system (PV system) for residence and business suddenly increases. Though each panel maker expands guarantee about output lowering and trouble of the PV system, the method to judge the degree and cause of output lowering is not established. The authors study on output lowering diagnostic method using the % electric energy. At first in this paper, we examined an output lowering judgment using the % electric energy. It became clear that the judgment of the output lowering using the % electric energy was possible,even if it was the day when the sunlight strength was unstable. In addition,it became clear that the evaluation of % electric energy was possible by using different weather data(ambient temperature, wind speed and global solar irradiance)when we could not measure weather data(total solar irradiance and module temperature)to be necessary for the evaluation. We were able to confirm that there was strong correlation between a change of the % electric energy and change of the evaluation. We were able to confirm that there was strong correlation between a change of the % electric energy and change of the output. Finally the authors propose the value that attracted standard deviation from the mean of the % electric energy as a decision method of the criteria of the output lowering using the % electric energy.
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  • Tomohisa Yamada, Junji Morikawa, Chuzo Ninagawa
    2015 Volume 35 Issue 3 Pages 212-218
    Published: 2015
    Released: March 27, 2015
    JOURNALS FREE ACCESS
    Web services have been studied mainly for business information systems so far. Recently,one of such web services protocol,namely BACnet/WS,has begun to be used for building facility remote monitoring system over the Internet. However,special attentions should be paid on communication performance in cases of burst transient IP packet loss states. This paper studies influence of bust packet loss on communication performance of remote monitoring system for building facilities.
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