| 郝宁宁,江昔平.双层定型相变墙体传热特性的数值模拟——以合肥地区为例[J].安徽建筑大学学报,2024,32(): |
| 双层定型相变墙体传热特性的数值模拟——以合肥地区为例 |
| Numerical Simulation of Heat Transfer Characteristics of Double-layer Shaped Phase Change Wall——A Case in Hefei |
| 投稿时间：2023-04-20 修订日期：2023-05-29 |
| 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 transition temperature Fluent |
| 基金项目:新型蜂窝结构在大体积混凝土裂缝控制应用试验研究 |
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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，外相变板相变温度为36 ℃的相变墙体的综合表现更好，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，使用的相变温度为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 phase change 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 process of ordinary wall and double-layer phase change wall was simulated based on Fluent enthalpy-porosity method. The results show that under the working conditions in summer, the comprehensive performance of the phase change wall with the external phase change plate temperature of 36 ℃ is better. The heat flux on the inner surface of the wall is reduced by 20.53% compared with that of the ordinary wall, and the average delay time is about 1.8 times of that of the ordinary wall. In winter conditions, the temperature fluctuation of the inner surface of the wall with a phase change temperature of 14 ℃ is gentle, and the heat flux of the inner surface of the wall is reduced by 16.25% compared with that of the ordinary wall, and its attenuation multiple is about 1.2 times of that of the ordinary wall. In Hefei area, the external phase change layer with phase change temperature of 36 ℃ and the inner phase change layer with 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 and heating periods. This kind of wall has good energy-saving effect and economic benefits. |
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