Shading and cooling effects of spray on the surface of glass roof of building

Develops the experimental system of spray on the surface of glass roof. Tests the shading and cooling effects with different droplet sizes and distribution densities of micro-droplets. The results show that shading rate is between 21.3% and 38.5% under six test conditions. The smaller the size of micro-droplets is, the better the shading effect will be. The shading rate of same size micro-droplet is increased by 8% when the distribution density is doubled. When the solar radiation intensity ranges from 400 to 1 000 W/m2, both the shading amount and the shading rate increases with the increase of solar radiation intensity. The average temperature on inner surface of glass roof reduces by 16 ℃, and the peak temperature on inner surface of glass roof decreases from 60 ℃ to 43.9 ℃.