On-site measurement of the different painting colors’ effects on optical-thermal performance of building facades

Abstract

In hot summer and warm winter zone, the exterior coating of the building needs to adapt to the local climate in order to reduce the thermal absorption and improve indoor and outdoor thermal comfort. In this paper, we use POI (point of interest) data among 1891 kindergartens to analyze the typical colors of facades, and cluster four highest frequency colors (red, yellow, green and blue) from the POI data. We measure the spectrum of visible light, surface temperature, and the reflectance of different color coatings of a determinant block which is composed of buildings with same faade form and layout in the high-density city. The results confirm that surface temperature has a significant negative correlation with reflectance among different colors of paints. Furthermore, as brightness of paints increases, surface temperature decreases. The results can provide suggestions on building facade optimization design.