Experimental and numerical studies on the melting heat storage of metal honeycomb-enhanced phase-change materials

doi:10.19799/j.cnki.2095-4239.2024.0806

Abstract

Abstract:

The metal honeycomb-enhanced phase-change energy storage system is an advanced technology for improving latent heat storage efficiency. To study its melting heat storage performance, a circulating water heating system was designed to provide a stable and uniform heat source. Subsequently, a heat storage test of enhanced phase-change materials was conducted at constant temperature, and the transfer and melting boundary evolution characteristics were obtained. The experimental results show that the metal honeycomb affects the melting heat storage efficiency in three ways: it improves thermal conductivity, weakens natural convection, and alters melting heat storage patterns. The effect of the metal honeycomb was quantified by establishing a fluid-solid-thermal coupling calculation model for melting heat storage. The calculation results indicate that the high thermal conductivity channel constructed by a 5 × 5 metal honeycomb can increase thermal conductivity by 39.7 times and reduce the natural heat transfer effect of the liquid phase to 19.1%, with an overall increase in the melting heat storage efficiency of 67.1%. The increase in the heat storage rate is primarily concentrated in the 0 < f < 0.5 stage, whereas the average heat storage rate in the 0.5 < f < 1 stage closely aligns with that of pure PCMs. Under the competition between heat conduction and natural convection heat transfer, the melting heat storage efficiency first decreases and then increases as the cell number increases, with the 3 × 3 honeycomb structure exhibiting the lowest heat storage efficiency. When the number of cells ranges from 1 × 1 to 3 × 3, natural convection in the liquid phase dominates heat transfer. However, when the number of cells exceeds 3 × 3, the heat conduction of the metal honeycomb dominates heat transfer.

Key words: honeycomb metal, n-octadecane, melting heat storage, experimental test, numerical simulation

CLC Number:

TK 124

Weijie CHAI, Xijia ZHAO, Shihao CAO. Experimental and numerical studies on the melting heat storage of metal honeycomb-enhanced phase-change materials[J]. Energy Storage Science and Technology, 2024, 13(12): 4357-4367.

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材料	参数	数值
正十八烷	固相密度 ρ_s/(kg/m³)	865
	液相密度 ρ_l/(kg/m³)	776
	固相比热容 C_s/[J/(kg·K)]	1934
	液相比热容 ρ_l/(kg/m³)	2196
	固相导热系数 k_s/[W/(m·K)]	0.358
	液相导热系数 k_l/[W/(m·K)]	0.152
	动力黏度 µ/(Pa·s)	0.0036
	熔化温度 T_m/K	301.35
	相变区间 ΔT/K	1
	相变潜热 L/(kJ/kg)	243.5
	热膨胀系数 α/K^-1	9.1×10^-4

AlSi10Mg铝合金	密度 ρ/(kg/m³)	2675
	比热容 C/[J/(kg·K)]	903
	导热系数 k/[W/(m·K)]	156.7

工况	计算模型	蜂窝阵列	液相自然对流	总熔化时间
1	纯相变材料	0×0，无	忽略	t_t1

2	纯相变材料	0×0，无	考虑	t_t2

3	增强相变材料	5×5	忽略	t_t3

4	增强相变材料	5×5	考虑	t_t4

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