Page 48 - GRIHA Manual Volume III - Introduction to National Rating System
P. 48
Building and system design optimization 41
Figure 23 Optimum shading requirement for southern façade
b. Shading analysis for eastern façade
Here, the critical sun angle is the vertical shadow angle (VSA) of 45º on a vertical plane normal to
the elevation. This characterizes a horizontal shading device of 1500 mm (minimum), which can be
further modified into two parts of 900 mm horizontal louver with arch-shaped drop of 600 mm on
sides to 300 mm at centre (retaining the shape of the proposed shading pattern by the architect).
Figure 24 Optimum shading requirements for eastern façade
Figure 23 Optimum shading requirement for southern façade
b. Shading analysis for eastern façade
Here, the critical sun angle is the vertical shadow angle (VSA) of 45º on a vertical plane normal to
the elevation. This characterizes a horizontal shading device of 1500 mm (minimum), which can be
further modified into two parts of 900 mm horizontal louver with arch-shaped drop of 600 mm on
sides to 300 mm at centre (retaining the shape of the proposed shading pattern by the architect).
Figure 24 Optimum shading requirements for eastern façade
