Cooling Coating for Buildings Based on the Daytime Radiative Cooling Technology

Abstract

In order to investigate the cooling effect of the radiative cooling material in the form of coating applied to buildings, a fiber-reinforced calcium silicate plate covered with radiative cooling coating was prepared on the basis of solving the bonding strength of coating in the research. The plate was used as the roof for the building model. The temperature at the face center on the inside of the roof and the inner body center of the building was tested on sunny and hot summer days. The results show that in the continuous 48-hour monitoring process, the radiative cooling coating can achieve a cooling effect of up to 28.8 °C at the backside of the roof, and 20.8 °C inside the building compared with an ordinary building without coating. Moreover, the coating also shows a sub-ambient cooling effect of 9.8 °C, even allowing the temperature inside the building to be lower than the air temperature under the shade.