Thermal response in thermal energy storage material around heat transfer tubes: Effect of additives on heat transfer rates

Yuichi Hamada, Wataru Ohtsu, Jun Fukai

研究成果: ジャーナルへの寄稿学術誌査読

94 被引用数 (Scopus)

抄録

The effects of carbon-fiber chips and carbon brushes as additives on the thermal conductivity enhancement of phase change materials (PCMs) using in latent heat thermal energy storage are investigated experimentally and numerically by considering the wall effect of the additives. The carbon-fiber chips are effective for improving the heat transfer rate in PCMs. However, the thermal resistance near the heat transfer surface is higher than that for the carbon brushes. As a result, the overall heat transfer rate for the fiber chips is lower than that for the carbon brushes. Consequently, the carbon brushes are superior to the fiber chips for the thermal conductivity enhancement under the present experimental conditions. The carbon brushes are moreover applied to the packed beds of particles to overcome their low thermal conductivity in chemical heat pump/storage. The carbon brushes essentially improve the heat transfer characteristics in the packed beds, though the thermal resistance is observed because the particles obstruct contact between the fibers and the heat transfer surfaces.

本文言語英語
ページ(範囲)317-328
ページ数12
ジャーナルSolar Energy
75
4
DOI
出版ステータス出版済み - 10月 2003

!!!All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • 材料科学一般

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