Journal of the Japanese Society of Snow and Ice
Online ISSN : 1883-6267
Print ISSN : 0373-1006
Search
Advanced search
OR
Browse
Search
Volume 52, Issue 2
Displaying 1-5 of 5 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • A new system for controlled snow sliding on a roof
    Moriaki TAMURA, Isamu HIRAYAMA, Shinnosuke MIYAUCHI
    1990 Volume 52 Issue 2 Pages 81-90
    Published: June 30, 1990
    Released on J-STAGE: July 23, 2009
    DOIhttps://doi.org/10.5331/seppyo.52.81
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    A system for controlled snow removal from a roof was developed using planar electric heaters, a snow depth detector, two thermistors and a digital circuit including a microprocessor. In the system, planar heaters controlled by the snow depth detector and two thermistors heat a roof surface causing the snow cover to slide down from the roof. The performance was evaluated during the periods from February, 1984 to March, 1984, and from January, 1985 to March, 1985. As a result, it was possible to remove the snow cover safely, even when heaters of a low electric power density, 30 W/m2 were used.
    View full abstract
    Download PDF (7257K)
  • Sublimation rate of collected blowing snow in a Cyclone type collector
    Takeshi SATO
    1990 Volume 52 Issue 2 Pages 91-98
    Published: June 30, 1990
    Released on J-STAGE: July 23, 2009
    DOIhttps://doi.org/10.5331/seppyo.52.91
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Sublimation rate was calculated of the collected blowing snow in a Cyclone type collector on the basis of energy balance of the snow in the collector. Measurements of sublimation rate were also carried out in a cold room under controlled conditions of air temperature, humidity, and wind speed.
    The calculations show that the sublimation rate increases with the increase of air temperature and with the increase of a transfer coefficient for sensible heat, which is close to that for water vapor. The sublimation rate is also shown to decrease with the increase of relative humidity of the air. These results are consistent with the experimental data.
    The transfer coefficient for sensible heat (water vapor) was obtained from the measured sublimation rates. The transfer coefficient is an increasing function of ambient wind speed, and it does not depend on air temperature, humidity, or the depth of the snow in the collector.
    With the obtained experimental relation between the transfer coefficient and ambient wind speed, charts are presented to give the sublimation rate under various meteorological conditions (air temperature, humidity, and wind speed).
    View full abstract
    Download PDF (1172K)
  • [title in Japanese]
    [in Japanese]
    1990 Volume 52 Issue 2 Pages 99-112
    Published: June 30, 1990
    Released on J-STAGE: July 23, 2009
    DOIhttps://doi.org/10.5331/seppyo.52.99
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    [in Japanese]
    View full abstract
    Download PDF (2366K)
  • [title in Japanese]
    [in Japanese]
    1990 Volume 52 Issue 2 Pages 113-116
    Published: June 30, 1990
    Released on J-STAGE: July 23, 2009
    DOIhttps://doi.org/10.5331/seppyo.52.113
    JOURNAL FREE ACCESS
    Download PDF (5417K)
  • Erratum
    1990 Volume 52 Issue 2 Pages 142
    Published: 1990
    Released on J-STAGE: July 23, 2009
    DOIhttps://doi.org/10.5331/seppyo.52.2_142
    JOURNAL FREE ACCESS
    Download PDF (99K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top