Fig. 6 shows the variations of the SHGC of the system of single pane clear glass window and vertical venetian blind with slat angle setting at 0 degree compared with the SHGC of the plain clear glass for different solar vertical profile angle.
From Fig. 6, one can see that the SHGC for the plain clear glass is dependent on the solar vertical profile angle.
For the positive value of solar vertical profile angle, the SHGC has the maximum value of 0.836 at 0 degree of solar vertical profile angle and the value is slowly decreased as the solar vertical profile angle is increased up to about 60 degree.
Then its value is rapidly decreased to 0 at 90 degree of solar vertical profile angle.