Simulation of heat storage process in spiral fin phase change heat storage unit

doi:10.19799/j.cnki.2095-4239.2020.0415

Abstract

Abstract:

Tubular heat exchangers are widely used in phase change heat storage, but heat transfer is usually poor because of the low thermal conductivity of phase change materials (PCM). Therefore, improving the heat transfer efficiency of the phase change heat storage unit and shortening the solid-liquid phase change time are the focus of this research. In this paper, a three-dimensional unsteady simulation was conducted to study the influences of the fin structure, thickness, number, and spiral cycle on the heat storage performance. The mean temperature, liquid fraction, and heat storage of the PCM during the melting process were also discussed. The simulation results showed that the melting time of the PCM of the spiral fin heat storage unit was shortened by 12.21% compared with that of the flat fin. With the increase in the thickness, number, and spiral cycle of spiral fins, the amount of heat storage slightly reduces. However, the PCM melting time was shorter, and the heat transfer performance was improved continuously.

Key words: heat storage, phase change heat exchanger, performance optimization, spiral fin

CLC Number:

TK 02

Junlei WANG, Xianggui XU, Tong SUN, Hua YAO, Minghang SONG, Yan WANG, Yun HUANG. Simulation of heat storage process in spiral fin phase change heat storage unit[J]. Energy Storage Science and Technology, 2021, 10(2): 514-522.

Figures/Tables 11

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材料	密度/kg·m^-3	热导率/W·m^-1·K^-1	相变潜热/kJ·kg^-1	比热容/kJ·kg^-1·K^-1	相变温度/K
相变材料	1818.10	0.53	95.00	1.52	503.15
换热流体	1.23	0.024		1.01
钢	8030.00	16.27		0.50

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