Solar shading

 
      
The sun angle in summer solstice (22 June) at 9:00am is 63 degrees at 83
degrees east. The sun angle in winter (22 Dec) at 10:00am is 40 degrees at 145
degrees east. The louvers on east facade are 200mm spaced 150mm apart.

        
The sun angle in summer solstice at 4:00pm is 35 degrees at 75
degrees west. The sun angle in winter solstice at 3:00pm is 40 degrees at 145
degrees west. The louvers on west facade are100mm spaced 100mm apart.
The louvers on south facade is 50mm spaced at 500mm apart.

Two angles a_s  and  a_w describe the shading geometry. These angles determine the
amount of shading of south-facing windows at solar noon throughout the year. If the sun
elevation at solar noon is greater than a_s (summer), then the window is completely
shaded. If the sun elevation at solar noon is less than a_s but greater than a_w
(spring and fall), then the window is partially shaded. If the sun elevation at solar noon
is less than a_w (winter), then the window is completely unshaded.

  Sun angle determination

  Sun Position Calculation

  Window overhang design