泡沫玻璃颜色及孔隙结构对屋面蒸发降温的影响

为了探究泡沫玻璃颜色及孔隙结构对屋面蒸发降温的影响,首先,对比不同颜色和孔隙结构的泡沫玻璃、红色饰面磁砖和灰色加气混凝土在不同波长下的太阳辐射吸收率;然后,测试不同材料块的饱和含水量,并将其贴于绝热块上,模拟其在夏季气候条件下的水平屋面被动蒸发降温效果、水分蒸发量、贴面和外表温度.结果表明:白色、深灰色、黑色泡沫玻璃的太阳辐射吸收率依次为0.32,0.71,0.94;通孔泡沫玻璃的体积保水量是闭孔泡沫玻璃的2.5~3.0倍,采用通孔泡沫玻璃可以极大提高材料的保水量;白色通孔泡沫玻璃不仅可以减少太阳辐射量的吸收,并且饱和含水量较大,可延长蒸发降温持续时间,是适合用于屋面被动蒸发的多孔材料.

Influence of Color and Pore Structure of Foam Glass on Evaporation and Cooling of Roof

In order to research the influence of color and pore structure of foam glass on evaporation and cooling of roof, the absorption rates of different wavelengths of solar radiation on foam glass with different color and pore structure, red facing tiles and gray aerated concrete were compared. The saturated water content of different material blocks was tested, and they were attached to the insulation block to simulate the passive evaporative cooling effect, water evaporation, veneer and appearance temperature of the horizontal roof under summer weather condition. The results show that: solar radiation absorption rates of white, dark gray, and black foam glass are 0.32, 0.71 and 0.94 in sequence; the volume water retention of through-cell foam glass is 2.5~3.0 times as large as that of closed-cell foam glass, the through-hole foam glass can greatly increase water retention capacity of the material. White through-hole foam glass can not only reduce the absorption of solar radiation, but also extend the duration of evaporation and cooling due to greater saturated water content, which can be used as porous material suitable for roof passive evaporation.