The magnitude of the reduction of the solar heat gain coefficient is mainly dependent on the type of the blind, the slat angle and the solar profile angle.
For slat angle of 45 and 0 degree, the reduction in solar heat gain coefficient for the glass window with blind compared with the plain glass window is increased with the solar profile angle.
Only at -45 degree slat angle, the reduction in solar heat gain coefficient for the glass window with blind compared with the plain glass window is decreased as the solar profile angle increased until the solar profile angle reaching 45 degree.
The reduction in solar heat gain coefficient starts to increase when the solar profile angle is further increased.
Installed venetian blind to the single pane clear glass window yields more reduction in solar heat gain coefficient compared to the double pane glass window in the same operating condition.
The white blind at the solar profile angle of 60 degree and slat angle of 45 degree gives the maximum value in the percentage of reduction for the solar heat gain coefficient value compared to the plain clear glass in both the single plain clear glass and double plain clear glass.