Technology for Snow-Accretion Removal by Cyclic Heating

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  • 周期加熱による着雪除去技術
  • シュウキ カネツ ニ ヨル キ セツ ジョキョ ギジュツ

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The aim of this study is to develop a new technology to remove accreted snow safely and less expensively. The cyclic heating method, a combination process of heating and cooling, involves the formation of a thin freezing layer on the contact surface of the accreted snow, and to ease slipping down at the final heating process. Compare with the melting method, there are some advantages such as relatively low energy consumption and no icicle formation by refreezing of melt water. A simulated snow of 40mm square area was placed on an aluminum plate with given depth of 15, 20 and 25mm. The cyclic heating process involves heating for 2, 3 or 4 s, active cooling for 30 s and natural cooling for 90 second. The active heating and cooling of the plate is performed using a Peltier device set on the opposite side of the plate. The first experiment to judge accreted snow slipping-down showed successful conditions of the number of cycles, heating time and depth of accreted snow. The second experiment of freezing layer observation showed accreted depths of 20mm or more and a freezing area ratio of 90% or more resulted in slipping down of accreted snow.

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