A south facing window is 2.1 m high and 4.2 m long. A horizontal diffuse reflector is places in front of the window and hinged at the bottom edge of the window. Radiation data for an hour are I = 1.61 MJ/m^2, I_d = 0.33 MJ/m^2, I_b = 1.28 MJ/m^2 and R_b = 2.31. If the (diffuse) reflectance of the reflector is 0.85, what will be the total irradiation per unit area on the window? Solution we know that total radiation=incident radiation=beamed radiation.

1. A south facing window is 2.1 m high and 4.2 m long. A horizontal diffuse reflector is places in
front of the window and hinged at the bottom edge of the window. Radiation data for an hour are
I = 1.61 MJ/m^2, I_d = 0.33 MJ/m^2, I_b = 1.28 MJ/m^2 and R_b = 2.31. If the (diffuse)
reflectance of the reflector is 0.85, what will be the total irradiation per unit area on the window?
Solution
we know that total radiation=incident radiation=beamed radiation