Heat transfer characteristics of the latent heat thermal energy storage capsule |
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Authors: | Kozo Katayama Akio Saito Yoshio Utaka Akihiro Saito Hideo Matsui Hiromichi Maekawa AZA Saifullah |
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Affiliation: | Department of Mechanical Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan |
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Abstract: | The characteristic variation of the rate of heat transfer to and from a latent heat thermal energy storage capsule was investigated analytically and experimentally. Basic experiments were carried out to simulate a solar energy storage capsule, using a horizontal cylindrical capsule (300 mm length, 40 mm o.d.) filled with naphthalene as the phase change material. The variation of heat flux during the processes of heat storage and removal was measured by a heat flow meter wrapped around the capsule, as the capsule was subjected to stepwise variations of the surface temperature. Finite difference calculations based on heat conduction were also carried out to compare with the experimental results. For the heat removal process, the experimental results and the calculated heat flux agreed well with each other. They showed different characteristic trends for the heat storage process, due to the effects of natural convection. |
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