Abstract:

The study of the surface temperatures of permeable cement bricks in different colors under various landscaping environments is of significant importance for improving the microclimate in arid and semi-arid regions. This research focuses on four commonly used colored permeable cement bricks (black, red, yellow, and green) in Lanzhou Urban Parks, with slate as the control (CK). Both indoor light simulation experiments and outdoor experiments under different shading conditions (no shadow, semi-shadow, and full shadow) were conducted. The results indicated that: (1) the indoor light simulation experiment showed that the darker the color of the permeable brick, the higher its surface temperature, and there was a positive correlation between heat flux and surface temperature. (2) In the no-shadow experiment, the highest surface temperatures for the different bricks were 63.7, 63.4, 61.5, 53.5 and 54.2℃, with average heat flux values of 236.7, 196, 166.9, 162.2 and 149.1 W/m², respectively. (3) In the semi-shadow experiment, the highest surface temperatures for the different bricks were 45.4, 45.4, 41.7, 39.7 and 40.1℃, with average heat flux values of 55.7, 67.1, 39.3, 24.6 and 28.6 W/m², respectively. Compared to the no-shadow experiment, both the surface temperatures and heat flux were significantly lower. (4) In the full-shadow experiment, the highest surface temperatures for the different bricks were 31.2, 30.9, 30.5, 30.4 and 30.1℃, with average heat flux values below 0 W/m². Compared to the no-shadow experiment, both the surface temperatures and heat flux were markedly reduced. Based on the color depth of permeable bricks and combined with shadow layout, reasonable design can help improve the microclimate in arid and semi-arid regions.

Key words: garden, microclimate, garden pavement, permeable bricks, heat flux, paving application, color of permeable brick, arid and semi-arid