Melting heat storage properties of metal honeycomb/paraffin composite phase change materials

doi:10.19799/j.cnki.2095-4239.2023.0652

Abstract

Abstract:

To elucidate the competitive correlation between metal honeycomb heat conduction and natural convection heat transfer in the liquid phase during the melting heat storage process of metal honeycomb/paraffin composite phase change material (PCM), a computational model based on the fluid-solid-thermal coupling theory was established. The phase change paraffin melting test was conducted to verify the effectiveness of the proposed computational model. Furthermore, the enhancement effect of metal honeycomb heat conduction and natural convection heat transfer in the liquid phase were analyzed, along with their competitive correlation. The results show that the heat storage process of phase change paraffin melting in a square cavity under bottom heating can be divided into four stages: heat conduction, steady growth, transition, and turbulence. The proportions of each stage in the total melting time are 0.8%, 2.3%, 13.6%, and 83.3%, respectively. Barrier-free heat transfer is realized with the natural flow of liquid paraffin, improving the thermal storage efficiency of phase change paraffin. The enhancement effect of natural convection heat transfer is considerably weakened with the decrease in size and becomes negligible when the size is less than 2 mm. Increasing the thermal conductivity and heat transfer area of the metal honeycomb can improve the thermal storage efficiency of phase change paraffin. After embedding the metal honeycomb, a multilayer melting phenomenon occurs in the PCM heat storage process, creating a temperature gradient in the melting zone. Compared with the heat storage efficiency of pure paraffin, the effect of the metal honeycomb is first enhanced and then inhibited. When the melting fraction exceeds the critical value 0.77, the metal honeycomb enters the inhibition stage.

Key words: honeycomb metal, phase change materials, high heat conduction, natural convection, competitive relationship

CLC Number:

TK 124

Peng NI, Shihao CAO. Melting heat storage properties of metal honeycomb/paraffin composite phase change materials[J]. Energy Storage Science and Technology, 2024, 13(2): 425-435.

Figures/Tables 11

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材料	名称	参数	单位	数值
铝蜂窝	密度	ρ	kg·m^-3	2675
	比热容	C	J·kg^-1·K^-1	903
	导热系数	k	W·m^-1·K^-1	211
相变石蜡	密度	ρ	kg·m^-3	880
	比热容	C	J·kg^-1·K^-1	3220
	导热系数	k	W·m^-1·K^-1	0.2
	动力黏度	µ	Pa·s	0.00579
	融化温度	T_m	K	300
	融化区间	ΔT	K	1
	相变潜热	L_m	J·kg^-1	210500
	热膨胀系数	α	K^-1	0.001

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