Study on the Mechanism of Coagulation and Cooling of Phase-Change Latent Heat Storage Material Sodium Acetate Trihydrate in a Horizontal Rectangular Container

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  • Inagaki Terumi
    Department of Mechanical Engineering, Faculty of Engineering, Ibaraki University
  • Isshiki Toshihiro
    Department of Mechanical Engineering, Faculty of Engineering, Ibaraki University
  • Li Yanrong
    Department of Mechanical Engineering, Faculty of Engineering, Ibaraki University

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  • 水平矩形容器内に充填した相変化蓄熱物質の凝固・冷却機構に関する研究─酢酸ナトリウム3水和物の現象論的考察─
  • 水平矩形容器内に充填した相変化蓄熱物質の凝固・冷却機構に関する研究 : 酢酸ナトリウム3水和物の現象論的考察
  • スイヘイ クケイ ヨウキ ナイ ニ ジュウテン シタ ソウヘンカチクネツ ブッシツ ノ ギョウコ ・ レイキャク キコウ ニ カンスル ケンキュウ : サクサン ナトリウム 3 スイワブツ ノ ゲンショウロンテキ コウサツ

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Abstract

This study aims to elucidate the phenomena of the coagulation and cooling process of the phase-change thermal storage medium sodium acetate trihydrate. The three-dimensional coagulation and cooling process of pure sodium acetate trihydrate without additives during thermal storage in the liquid phase were visualized using an infrared camera and a video camera in a horizontal enclosed rectangular container and a horizontal rectangular container with a free surface. Image processing based on the acquired visualization data was carried out with a computer, and various physical quantities peculiar to the cooling process were elucidated experimentally. As a result, we clarified for the first time the relation between the degree of critical supercooling and the average cooling velocity. Moreover, the influence of the degree of critical supercooling on the coagulation process was clarified three-dimensionally and phenomenologically using a series of visual and thermal images.

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