Energy storage characteristics of porous inorganic composite phase-change materials based on the Lattice Boltzmann Method

doi:10.19799/j.cnki.2095-4239.2022.0427

Abstract

Abstract:

The effect of skeleton morphology on the energy storage characteristics of inorganic composite phase change materials (CPCM) was studied. The quartet structure generation set was used to construct the porous media based on the Lattice Boltzmann Method. The CPCM phase transformation model with a randomly distributed porous medium was developed in line with this. On this basis, the influences of porosity (ε), solid growth core distribution probability (P_c), directional growth probability (P_d), and Rayleigh number (Ra) on CPCM energy storage characteristics were studied. The results show that the melting time of CPCM decreases as ε decreases. The total melting time of CPCM when ε is 0.70 was 23.63% less than that of 0.90. The increasing of the P_c and the decreasing of the P_d can improve the melting rate of CPCM under the same ε (0.90). The total melting time of CPCM decreases with the increase of Ra because the increase of Ra increases the intensity of natural convection. And the total melting time of CPCM when Ra is 18000 is 41.46% less than that of 1000. This study offers a theoretical foundation and a reference point for the energy storage properties of inorganic porous medium CPCM.

Key words: Lattice Boltzmann Method, porous medium, quartet structure generation set, phase change energy storage

CLC Number:

TK 02

Tingting CUI, Yan WANG. Energy storage characteristics of porous inorganic composite phase-change materials based on the Lattice Boltzmann Method[J]. Energy Storage Science and Technology, 2023, 12(1): 61-68.

Figures/Tables 11

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物性参数	CaCl₂·6H₂O	多孔骨架
相变点/℃	29.9	—
密度/(kg/m³)	1710	900
热膨胀系数/K^-1	3.5×10^-4	—
导热系数/[W/(m·K)]	0.567	5.67
动力黏度/[kg/(m·s)]	3.26×10^-3	—
比热容/[J/(g·K)]	1.45	700
潜热/(J/g)	190	—

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