With the use of a seasonal change in the solar altitude, a solar control window was proposed, which can change both solar, visible ray transmittance and solar heat gain factor according to the control purposes, by using the rotating blind with the various shaped and different thermal characteristic slats. The window can decrease solar heat gain, while increasing the use of daylight. This paper describes the principle of the solar control window and its solar control performance by developing a performance simulation system. Next paper describes the estimated simulation results of its energy performance with the use of a typical office building model.
