Evaluation of the effect when applying a heat shield paint to an externally insulated building with a vent layer and its infrared sensing

Abstract

The heat island problem has become increasingly serious owing to the concentration of population and industry in big cities around the world. Therefore, in this study, we focused on a heat shield paint which can reduce thermal storage in concrete buildings in summer. Under near-infrared heating, far-infrared heating and solar heating conditions, we clarified the thermal radiation characteristics of the heat shield paint. In an experiment under sunlight heating, it checked that the heat-shield effect of the heat shield paint under near-infrared light contained in the sunlight of the strong time zone of solar radiation among daytime is large, and that the heat-shield effect before sunrise or after sunset is small. In the experiment under near-infrared heating, when the application state of a common white paint and a heat shield white paint was compared, the heat shield paint can control the heat flux which passes inside, and the painted surface temperature is also reduced. The experiment under far-infrared heating also checked some heat-shield effect. When the heat flux which enters into the painted surface of a building is equivalent, it becomes clear that the heat shield effect by near-infrared heating is larger than that of far-infrared heating. In addition, this tendency becomes remarkable with increasing solar radiation which enters into painted surfaces. Copyright © 2009 The Society of Chemical Engineers, Japan.