Abstract
Windows are largely affected by solar radiation, controlling heat radiation from window surfaces is of particular importance. The present study was performed with the recognition that, in order to calculate air-conditioning energy, the radiative component and the convective component of radiant heat must be known separately as they exhibit different heat transfer characteristics. This paper describes a method for measuring the solar radiation shading coefficient (SC) separated into a radiative and a convective component by a heat quantity-based shading coefficient measuring apparatus. The values of shading coefficients of ten conventional roller sahdes were measured with the experimental apparatus. The measured values of total SC were approximated by the measured reflectance of window, the values of short wave component of SC were approximated by the transmittance of window and the values of long wave component as well as the values of convective component of SC were approximated by the absorptance of window.
