| 摘要: |
| 通过对泡沫金属结构的分析，将泡沫金属结构简化为二维的循环扩展六边形网格形式，且传热单元被分为九个导热层。在此基础上以热阻分析推导出了在泡沫金属作为填充材料时其整体有效导热系数Koff与泡沫金属空隙率ε之间的数学关系式。分别以泡沫铜、泡沫铝填充石蜡为例与用铜、铝翅片并联和串联两种方式填充石蜡时的有效导热系数进行了计算对比，从计算结果可以明显看出采用泡沫金属作为填充材料，其整体效果要优于翅片，可显著改善相变储能装置的传热性能及储能效率。 |
| 关键词: 工程热物理 储能技术 泡沫金属 有效导热系数 空隙率 相变储能 |
| DOI： |
| 投稿时间：2007-07-03
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| 基金项目:航空基础科学基金;高等学校博士学科点专项科研项目 |
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| Analysis on Thermal Conductivity Enhancement for PCM Embedded in Metal Foam |
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| Abstract: |
| Analysis for estimating effective thermal conductivity of the phase change thermal energy storage filled up with metal foams was performed. Based on the analysis of metal foam structure, a model consisting of a two-dimensional array of hexagonal cells was established in which the fibers form the sides of the hexagons and the unit cell was assumed as nine heat transfer layers. The functional relations between the effective thermal conductivity and the porosity were derived with the thermal resistance analysis. In addition, numerical data of the effective thermal conductivity with paraffin embedded in aluminum foam and copper foam were compared with those with paraffin embedded in aluminum fin and copper fin. The results indicate that the thermal conductivity and efficiency of the phase change thermal energy storage by filling metal foams are obviously higher than those by filling metal fins. |
| Key words: Engineering thermophysics Energy storage technique Metal foam Effective thermal conductivity Porosity Phasechange energy storage |
