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Investigation of Dynamic Heat Transfer Characteristics and Structural Optimization of Latent Heat Storage System in a Vertical Tube with Longitudinal Fins

SSRN, ISSN: 1556-5068
2024
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Article Description

Latent heat storage plays an important role in the utilization of solar energy. The low thermal conductivity of phase change materials (PCM) seriously reduces the heat storage and release efficiency of latent heat storage system. In order to improve the storage/release efficiency of latent heat storage system, it is necessary to optimize the fin geometry. In order to study the effect of fin height and fin number on heat storage and release process, a three-dimensional numerical model with PCM natural convection is established. The numerical model is validated by the experiment. The fin volume of all models is the same, and the fin height is determined by annular space. The impact of fin heights (0.3ΔR, 0.5ΔR, 0.7ΔR, 0.9ΔR) and numbers (4, 8, 10, 16) on the heat transfer efficiency of the heat storage and release process was investigated through analysis of PCM temperature distribution on the shell section, liquid fraction within the shell over time, average heat transfer rate and heat flux. The results show that when the fin height increases from 0.3ΔR to 0.9ΔR, the heat storage and heat release completion time are reduced by 61.16% and 45.43%, respectively. When the number of fins increased from 4 to 16, the heat storage and release completion time reduced by 33.35% and 31.13%, respectively. It can be concluded that the increase of fin number and height will dilute the heat flux between fin and PCM during both the heat storage and release process, and the increase of fin number will lead to more heat flux reduction than the increase of fin height. Therefore, when the fin volume remains the same, increasing the fin height is more conducive to improving the heat transfer performance of the PCM during the heat storage and release process.

Bibliographic Details

Sheng tao Ou; Ping Wang; Huan Su; Xiao Chen; Ye Yang

Elsevier BV

Multidisciplinary; Thermal energy storage system; Geometric structure optimization; Inner fin tube; Fin hight/number; Fin volume ratio

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