| 江昔平,郝宁宁.双层定型相变墙体在合肥地区传热特性的数值模拟[J].安徽建筑大学学报,2024,32(1):27-35 |
| 双层定型相变墙体在合肥地区传热特性的数值模拟 |
| Numerical Simulation of Heat Transfer Characteristics of Double-layer Shaped Phase Change Wall in Hefei |
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| DOI： |
| 中文关键词: 双层相变墙体 焓-孔隙率法 相变温度 Fluent |
| 英文关键词: double-layer phase change wall enthalpy-porosity method phase change temperature Fluent |
| 基金项目:安徽省教育厅科研项目（KJ2011Z110） |
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| 中文摘要: |
| 为探究双层相变墙体所使用的相变材料在不同季节下的相变表现，以合肥地区夏、冬两季室外温度数据为背景，基于Fluent焓－孔隙率法，对普通墙体和双层相变墙体的传热过程进行仿真计算。结果表明，在夏季工况下，外相变板的相变温度为 36 ℃的相变墙体综合表现更好，墙体内表面热流密度与普通墙体相比降低了 20.53%，平均延迟时间约为普通墙体的1.8倍。在冬季工况下，内相变板的相变温度为14 ℃的相变墙体内表面温度波幅较平缓，墙体内表面热流密度与普通墙体相比降低了16.25%，它的衰减倍数约为普通墙体的1.2倍。在合肥地区，使用相变温度为36 ℃的外相变层和相变温度为14 ℃的内相变层的墙体在制冷、采暖期单位面积可降低热/冷负荷分别为1.86 W、3.75 W，该种墙体具有很好的节能效果和经济效益。 |
| 英文摘要: |
| In order to explore the performance of phase change materials used in double-layer phase change wall in different seasons, based on the outdoor temperature data of Hefei in summer and winter, the heat transfer processes of the ordinary wall and double-layer phase change wall were simulated with Fluent enthalpy-porosity method. The results showed that in summer, the phase change wall with the external phase change plate at 36 ℃ had the greatest comprehensive performance. Compared to the ordinary wall, the heat fluxon the internal surface of the wall was reduced by 20.53% and the average delay time was about 1.8 times. In winter, the temperature fluctuation of the internal surface of the phase change wall with the internal phase change plate at 14 ℃ was smooth. Compared to the ordinary wall, the heat flux of the internal surface of the wall was reduced by 16.25% and its attenuation multiple was about 1.2 times. In Hefei, the wall using the external phase change layer with a phase change temperature of 36 ℃ and the internal phase change layer with a phase change temperature of 14 ℃ can reduce the heat/cooling load of 1.86 W and 3.75 W per unit area, respectively, in the cooling/heating periods, which is energy-saving and economic. |
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