The SHGC is further divided into SHGC for the direct solar radiation (SHGCD) and SHGC for the diffuse solar radiation
(SHGCd).
The study is based on the predicted results calculated by the developed mathematical model.
The effect of the parameters of the fenestration on the SHGC are studied to gain more understanding about the thermal
performance of the glass window with a curved venetian blind installed.
Besides the understanding of the solar heat gain through the fenestration in the overall picture, one also needs to maintain the thermal comfort condition for the occupants in the space.
The understanding about the solar heat gain through the fenestration in the part of the shortwave and the longwave is needed.
The SHGC is further classified as the ShW SHGC and LoW SHGC.
Then, the effect of the related parameters on the ShW SHGC and LoW SHGC are investigated. Installing a curved venetian blind to the plain glass window causes the decrease in solar heat gain.
It is found that the amount of reduction in solar heat gain is mainly dependent on the slat optical properties, slat angle and solar profile angle.
It is also found that installing blind with a higher value of slat reflectance will yield a smaller value of SHGCD and SHGCd.
When considering the effect of slat reflectance on the ShW SHGCD and LoW SHGCD, though the higher value of the slat reflectance gives higher value of the ShW SHGCD, it gives a lower value of the LoW SHGCD.
It is also found that installing the blind with a lower value of slat reflectance gives a much higher value of SHGCD though the value of the ShW SHGCD is much lower.
The slat emittance does not have any effect on the ShW SHGCD and ShW SHGCd at all. There is only small effect from the variation of the slat emittance on the LoW SHGCD.
The slat spacing also affects the SHGCD and ShW SHGCD.
The glass window with blind of a lower value of slat spacing gives a lower value of SHGCD and ShW SHGCD.
The effect of the slat curvature on the SHGCD and ShW SHGCD is small when compared to the effect of other parameters.
The effect of the distance between the glass window and blind appears only on the LoW SHGCD. But the effects are not pronounced.
The effects of the investigated parameters on the SHGCd are similar to the effect on the SHGCD except for the case of the effect of the radius curvature.