The effect of slat curvature on the typical blind exists only when the blind is in some certain position.
It causes the blocked distance from the slat increased.
The analysis for the effect of slat curvature on the blocked distance can be performed based on the geometry shown in Fig. 2.
Fig. 2 shows the condition of the solar radiation incident on the curved slat in certain profile angle and the related
parameters.
The critical angle of the curved slat is defined as