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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

EFFECTS OF FABRICATION CONDITIONS ON SILICA HARD-SHELL MICROCAPSULES CONTAINING PHASE CHANGE MATERIALS

DOI: 10.1615/IHTC16.ecs.022594
pages 4319-4325

Ippei Watanabe
Department of Chemical Science and Engineering, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe-shi, Hyogo 657-8501

Nami Furukawa
Department of Chemical Science and Engineering, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe-shi, Hyogo 657-8501

Naoki Kuroda
Department of Chemical Science and Engineering, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe-shi, Hyogo 657-8501

Ruri Hidema
Department of Chemical Science and Engineering, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe-shi, Hyogo 657-8501, Japan; Complex Fluid and Thermal Engineering Research Center (COFTEC), Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe-shi, Hyogo 657-8501, Japan

Hiroshi Suzuki
Department of Chemical Science and Engineering, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe-shi, Hyogo 657-8501, Japan; Complex Fluid and Thermal Engineering Research Center (COFTEC), Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe-shi, Hyogo 657-8501, Japan

Yoshiyuki Komoda
Department of Chemical Science and Engineering, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe-shi, Hyogo 657-8501, Japan; Complex Fluid and Thermal Engineering Research Center (COFTEC), Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe-shi, Hyogo 657-8501, Japan

Takafumi Horie
Department of Chemical Science and Engineering, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe-shi, Hyogo 657-8501; Complex Fluid and Thermal Engineering Research Center, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe-shi, Hyogo 657-8501

Hitoshi Asano
Kobe University, Department of Mechanical Engineering 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan

Naoto Ohmura
Department of Chemical Science and Engineering Kobe University, Rokkodai, Nada, Kobe 657-8501, JAPAN


KEY WORDS: Energy conversion and storage, Thermal storage, Microcapsule, Latent heat

Abstract

In order to increase the void fraction in silica hard-shell microcapsules containing phase change materials, the effects of the reaction time for generating the silica shell have been investigated. The reaction time in the W/O/W double emulsion method for silica hard-shell microcapsule fabrication was changed from 10 to 120 min. The size and the shell thickness of hollow microcapsules were measured by a laser diffraction particle size analyzer and by an image processing method on SEM images, respectively. The void fraction was also confirmed by differential scanning calorimeter (DSC) measurements. As phase change materials, disodium hydrogen phosphate-12 water hydrate whose phase change temperature is 32°C and latent heat is 264kJ/kg was applied in this study. From this, it was found that the shell thickness increase with the reaction time, while the microcapsule size was constant after 30 min. The maximum void fraction was obtained when the reaction time was set at 10 min. It was 73.8vol%, which is larger than the results reported in the previous study. It was also confirmed by the latent heat measurements. Thus, it was concluded that the void fraction could be improved by the tuning of the reaction time.

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