抄録
Heat-ray absorbing sheet glasses can decrease electric energy used for air-conditioning by control the incoming heat-ray through windows into the rooms. On the other hand, the glasses increase the temperature and sometimes yield heat cracks by thermal stresses. It is important to know the state of thermal stresses accurately in order to develop heat-ray absorbing sheet glasses with higher performance and without heat cracks. A conventional design manual at field site treats the steady state and the thermal boundary condition that all heat-ray are absorbed at glass surface. In this paper, it is assumed that the heat-ray is absorbed over all the plate thickness. The idea of the absorptibity per unit length is introduced. The modeling can explain well that the total absorptivity depends on the plate thickness. The temperature and the thermal stresses are compared with ones calculated by the conventional design manual at field site.
