Journal of the Japanese Society of Snow and Ice
Online ISSN : 1883-6267
Print ISSN : 0373-1006
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Volume 27, Issue 3
Displaying 1-3 of 3 articles from this issue
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  • Electric Road Heating in Hokkaido
    Kaoru Harada, Yataro Ohasi
    1965 Volume 27 Issue 3 Pages 63-71
    Published: May 30, 1965
    Released on J-STAGE: September 04, 2009
    DOIhttps://doi.org/10.5331/seppyo.27.63
    JOURNAL FREE ACCESS
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    The development of the first practical electric snow melting installation in Hokkaido has succeeded sufficiently in the Sapporo city in winter 1963-1964. After this success many road heating systems were installed in every place. About 1700 m2 (480 kw) electrically heated roads in Hokkaido at the end of 1964 will have increased to 6000 m2 (1500 kw) by 1965.
    Summary of generally used electric road heating installation is :
    1) Heating cable is a 7/0. 5 m/m Ni-Cu alloy wire, butyl rubber insulated and P.V.C. sheathed.
    2) Cable is embedded 3-5 cm depth with 5-7 cm spacing.
    3) Watt-density is about 250 watt per square meter.
    4) Energy supply is 500-600 hour per season.
    The paper gives details of above experience in Sapporo, analysis and theory of road heating system, heating cables and some inotallations in the foreign country.
    It is also suggested that there is scope for futher research in this field, including the problems of watt-density damage of road surface, autmatic control and energy supply.
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  • Ice melting and prevention current of overhead transmission Tine
    Sihei Takagi
    1965 Volume 27 Issue 3 Pages 72-76
    Published: May 30, 1965
    Released on J-STAGE: September 04, 2009
    DOIhttps://doi.org/10.5331/seppyo.27.72
    JOURNAL FREE ACCESS
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    In this paper, it was assumed that joule's heat generated in the conductor is spent so as to rise the temperature of supercooled water droplets and snow particles captured on the conductor to above 0°C and is dissipated by forced convection and evaporation from the surface of the water film on the conductor. And, the equation of least ice prevention current was induced theoretically and experimentaly as a function of wire, supercooled water droplets, snow particles, wind velocity, air temperature, etc. According to the equation, the least ice prevention current is much more than the carying capacity under sever weather condition.
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  • The Forms of icing on Overhead Transmission Line Conductors and it's Wind Pressure
    Shihei TAKAGI
    1965 Volume 27 Issue 3 Pages 77-84
    Published: May 30, 1965
    Released on J-STAGE: September 04, 2009
    DOIhttps://doi.org/10.5331/seppyo.27.77
    JOURNAL FREE ACCESS
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    The forms of icing on overhead transmission line conductors were observed at Siori Pass and were classified into five types, that is, A, B, C, D and E. The models of the icing were made, and it's drag coefficient, lift coefficient and moment coefficient has been obtained by the experiments in the wind tunnel.
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