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Effect of porosity and pore density of copper foam on thermal performance of the paraffin-copper foam composite Phase-Change Material
Case Studies in Thermal Engineering ( IF 6.8 ) Pub Date : 2020-08-20 , DOI: 10.1016/j.csite.2020.100742
Xi Meng , Lianyu Yan , Jiaqi Xu , Fan He , Hanting Yu , Ming Zhang

Latent thermal energy storage was widely used in many thermal engineering, but the low thermal conductivity of Phase-Change Material (PCM) limited the thermal storage efficiency seriously. Filling metal foam has been an effective way to enhance the heat transfer due to its capability to improve the overall heat conduction effectively. To optimize the thermal performance of the paraffin-metal foam composite PCM, this study analyzed the influence laws of porosity and pore density of copper foam. A two-dimensional numerical model considering two-temperature non-equilibrium equation was built and validated by published results, while the four parameters including the liquid fraction, the temperature response rate, the heat flux, and heat storage capacity were evaluated. The results showed reducing the porosity could improve the thermal behavior of composite PCM especially between 92% and 98%, but it would reduce the heat storage capacity of about 22.3kJ per the 2% increased porosity. The recommended porosity was 92%. Moreover, increasing pore density could also enhance the thermal behavior of the composite PCM, especially between 5PPI and 15PPI, and it had no influence on the heat storage capacity.



中文翻译:

泡沫铜的孔隙率和孔密度对石蜡-铜泡沫复合相变材料热性能的影响

潜在的热能存储在许多热工程中被广泛使用,但是相变材料(PCM)的低导热率严重限制了热存储效率。填充金属泡沫由于其有效改善整体导热的能力而成为增强热传递的有效方法。为了优化石蜡-金属泡沫复合材料PCM的热性能,本研究分析了泡沫铜的孔隙率和孔密度的影响规律。建立并考虑了两温非平衡方程的二维数值模型,并通过公开的结果进行了验证,同时评估了液体分数,温度响应率,热通量和储热能力这四个参数。结果表明,降低孔隙率可以改善复合材料PCM的热性能,尤其是在92%到98%之间,但是每增加2%的孔隙率,它的储热量将减少约22.3kJ。推荐的孔隙率为92%。此外,增加孔密度还可以增强复合材料PCM的热性能,特别是在5PPI和15PPI之间,并且对储热能力没有影响。

更新日期:2020-08-20
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