摘要
为了有效反映相变材料在带有防晒墙的建筑中的节能效用,将防晒墙与相变墙体组合形成二维墙体传热模型,基于enthalpy-porosity法,通过数值模拟分析讨论了室外空气温度随时间正弦变化的条件下相变材料的相变温度和相变材料层的空间位置对外墙动态传热特性的影响。研究结果表明,相较于不含相变材料层的普通墙体,相变墙体内表面温度变化的波动范围更小,时间滞后更强。当相变材料的相变温度区间更靠近室外空气温度的平均值时,使用相变材料对改善室内环境的舒适性更好;而扩大相变材料的相变温度区间间隔,使得相变材料在相变过程中处于糊状区的时间变长,对室内环境舒适性不利。
In order to effectively reflect the energy saving effect of phase change material in buildings with sunscreen walls,a two-dimensional wall thermal transfer model is established by combining sunscreen walls with phase change material(PCM)walls.Based on enthalpy-porosity method,the influences of phase transition temperature range of PCM and the spatial position of PCM layer on the dynamic thermal transfer characteristics of wall under sinusoidal temperature boundary are numerically analyzed and discussed.The results show that compared with the ordinary wall without PCM layer,the fluctuation range of internal surface temperature of PCM wall is smaller and the time delay is stronger.When the phase transition temperature range of PCM is closer to the time-averaged value of outdoor air temperature which changes sinusoidally with time,using PCM are more conducive to the comfort of indoor environments.Expanding the phase transition temperature range of PCM makes PCM stay in the mushy region longer during the phase change process,which is unfavorable for the comfort of indoor environments.
作者
吴鸿飞
马兵善
王刚
周凤玺
WU Hongfei;MA Bingshan;WANG Gang;ZHOU Fengxi(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《甘肃科学学报》
2023年第5期129-134,共6页
Journal of Gansu Sciences
基金
国家自然科学基金项目(11962016)。
关键词
相变材料
节能
防晒墙
动态传热特性
Phase change material
Energy saving
Sunscreen walls
Dynamic thermal transfer characteristics
作者简介
吴鸿飞(1995-),男,四川宜宾人,硕士,研究方向为相变传热。E-mail:1039732202@qq.com。
