The effect of the slat curvature on ShW SHGC is also investigated and the results are shown in Fig. 20.
The slat curvature is referred by its radius of curvature. The radii of curvature of the slat ranging from 25 mm to 200 mm
are investigated.
The effect of slat curvature on the ShW SHGC is not as pronounced as the effect of other parameters investigated.
The glass window with blind with a smaller radius of curvature (more curved slat) gives a smaller value of ShW SHGC.
The effect of the radius of curvature is clearly seen in the range of solar profile angle from 0 to 15.
The ShW SHGC of the glass window system with blind of smaller values of curvature radius is smaller than the ShW SHGC of the glass window system with blind of higher values of curvature radius due to the blockage of the solar radiation from the projected area of the curved slat.
The effect of the distance between the blind and the inner surface of the glass window is also investigated.
The distance between the blind center to the inner glass window surface of 20, 30, 40, 50, 60 and 80 mm are used in the mathematical model to see the effect of the distance from the blind to the glass window surface to the ShW SHGC.
It is found from the predicted results that the effect of such distance to the ShW SHGC is negligible.