The results predicted from the mathematical model in form of the ratio of the transmitted radiation through the glass window installed with venetian blind to the incident radiation on the glass window are compared with the experimental results obtained from Chantrasrisalai and Fisher (2006).
It is found that the mathematical model gives accurate results, especially results in the afternoon (the results contribute from the total solar radiation (direct radiation and diffuse radiation)).
There is some discrepancy between the prediction results and the experimental results in the morning for a high reflectance blind occurred at slat angle of +45 degree.
This kind of discrepancy is not found for a high reflectance blind at slat angle of 0 and 40 degree and for a low reflectance
blind at slat angle of +45 degree.
In overall the developed optical model gives the predicted results accurate within the acceptable limit and better than the predicted results from the previous flat slat models (Chantrasrisalai and Fisher, 2006).
The developed mathematical model for shortwave optical properties of the effective layer for a curved venetian blind with thickness can then be used for evaluating the heat transmission.
When used the short wave optical properties along with the long wave optical properties of the effective layer, the performance of the glass window installed with venetian blind in aspect of heat transmission and thermal comfort can be accurately determined.