Abstract:

The porous pipes with high water soaking-up ability have been combined for evaporative cooling wall. Due to the influences of the temperature and humidity outside, the evaporative cooling occurs on the porous pipe surface, which connects with the temperature and its gradient as well as the moisture content and its gradient in the porous pipe, and the temperature drop of 5—8℃ can be achieved in the experiment. The water sucked up by the porous pipes causes the continuation of the evaporative cooling. As the wind speed coupled with the relative humidity influences the evaporative cooling, the temperature drop of 2℃ on the pipe surface can be obtained at 2.5 m·s^-1 than that at 1 m·s^-1. The rise of gaseous phase in the porous pipe leads to the reduction of the evaporative area. The experiments have also been conducted to study the water soaking-up performance of the porous pipe and the influence of the porous pipe arrangement on the cooling of the combined wall.

Key words: wet porous media, combining wall, heat transfer, mass transfer, numerical analysis

摘要：

将汲液多孔材料管组合为蒸发制冷墙体。在室外温、湿度影响下,含湿多孔介质表面及内部水分蒸发制冷作用与管内部温度及温度梯度、含湿量和湿含量梯度相关联。含湿多孔管的蒸发可使其表面温度降低5~8℃,通过多孔材料汲水补充蒸发所需水分。风速和环境相对湿度耦合作用于含湿多孔管的表面蒸发。环境相对湿度较低时段,与风速为1 m·s^-1相比,受2.5 m·s^-1风速影响的含湿多孔管表面温度可降低2℃。含湿多孔管气相分率增加,其表面蒸发面积减少。实验分析了多孔材料管的汲液特性以及组合墙体中含湿多孔管排列方式对墙体制冷特性影响。

关键词: 含湿多孔介质, 组合墙, 传热, 传质, 数值分析