Abstract
In recent years, the various windows have been proposed and developed in order to realize both solar shading and ilization of daylight. However, the method which verifies those thermal performances is not established. This report shows the simplified method for measuring solar shading performance with the Peltier device box. Although there was room of an improvement, it was shown that the Peltier device box could measure almost the solar heat gain coefficient of a window system with high solar shading performance.