多孔饰面砖墙体蒸发降温效果试验研究

Experimental Study of Evaporative Cooling Capacities of Wall with Porous Face Brick

以红色陶土烧结多孔饰面砖为研究对象,测试了不同浸水时间时多孔饰面砖的含水率(质量分数),测试了稳定热湿环境下不同时刻多孔饰面砖的水蒸发量和含水率,比较了不同淋水方案对多孔饰面砖墙体内、外表面温度和热流的影响规律.结果表明:红色陶土烧结多孔饰面砖适宜用作墙体蒸发降温介质水分的载体.稳定热湿环境下多孔饰面砖临界含水率为3.1%.多孔饰面砖淋水后可以显著地降低墙体内、外表面温度和热流.随着墙体淋水次数的增多,多孔饰面砖最低含水率增加,墙体内、外表面温度和热流的降幅有所增长,但当墙体淋水次数增至8次时,多孔饰面砖最低含水率将大于临界含水率,墙体内、外表面温度和热流的降幅将基本保持稳定.可以采用多孔饰面砖临界含水率作为墙体淋水的判断依据,在保证墙体蒸发降温效果的同时节省水资源.

The red clay sintered porous face brick was selected as the research object. The moisture con- tents（by mass） of porous face brick at different soaking times were measured. At stable thermal and hu- mid environment, the water evaporation amounts and moisture contents of porous face brick at different times were also tested. The influences of watering schemes on inner and outer surface temperatures and heat flows of wall were compared. The results show that the red clay sintered porous face brick is suitable for the water carrier during evaporation cooling of wall. In the stable thermal and humid environment, the critical moisture content of porous face brick is 3.1%. The inner and outer surface temperatures and heat flows of wall could be decreased significantly when the porous face brick is watered. With the increase of watering number, the lowest moisture content of porous face brick is ascend and the decreasing amplitudes of inner and outer surface temperatures and heat flows of wall are continuously rising. When the watering number increases to 8 times, the lowest moisture content of porous face brick will be greater than the criti- cal moisture content, and the decreasing amplitudes of inner and outer surface temperatures and heat flows of wall tend to be stable. Therefore, the critical moisture content of porous face brick can be used as a cri- terion for watering to save water while facilitating the evaporative cooling effect.