Simplified Heat Transfer Model of Horizontal U-Tube (HUT) System

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Abstract

冬期におけるトンネル抗口での交通事故防止のために, トンネル内の浅層地中熱を利用した水平Uチューブ (HUT) ロードヒーティングシステムが福島県会津坂下市の七折峠トンネルの西側坑口に日本で初めて導入した。HUTにより採集された地中熱はトンネル坑口の無散水舗装体で放出された。<br>本研究では簡易なHUTシステムの熱輸送モデルが提案される。提案モデルはHUTを循環する流体のエネルギー保存式と周辺地盤のエネルギー保存式で構成される。この両式を同時に解くことで採集される地中熱および流体と地盤の温度が計算され, 流体と地盤との間の熱貫流率を求めることができる。モデルの有効性は模型のHUTを用いた室内実験結果との比較により示すことができた。

Paying attention to the shallow ground heat inside a tunnel, a Horizontal U-Tube (HUT) road heating system was introduced for the first time in Japan in order to prevent winter traffic accidents associated with road freezing at the west side mouth of Nanaori-Toge tunnel, Aizu-bange, Fukushima Prefecture. Horizontal U-tubes were buried at a depth of 1.2 m in the ground of the central part of the tunnel. The ground heat extracted by the HUT is injected into the anti-freezing pavement at the tunnel mouth.<br>In this study, attempts were made to propose a simplified heat transfer model of HUT system. The proposed model consists of the energy balance equations of the fluid circulating in the HUT and the surrounding ground. Solving these two equations simultaneously, the extracted ground heat could be calculated as well as the fluid and ground temperatures. The model could also lead the overall heat transfer coefficient between the fluid and the surrounding ground. The validity of the model was accepted from the comparison with indoor experimental results using a miniature HUT.

Journal

  • Journal of Snow Engineering of Japan

    Journal of Snow Engineering of Japan 23(3), 232-239, 2007-07-01

    Japan Society for Snow Engineering

References:  12

Codes

  • NII Article ID (NAID)
    10019757282
  • NII NACSIS-CAT ID (NCID)
    AN10063773
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    09133526
  • NDL Article ID
    8926562
  • NDL Source Classification
    ZN1(科学技術--建設工学・建設業)
  • NDL Call No.
    Z16-1548
  • Data Source
    CJP  NDL  J-STAGE 
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