where t is the front transmittance of the effective layer for a curved blind with thickness for diffuse radiation which comes from the sky.
t is the front transmittance of the effective layer for a curved blind with thickness for diffuse radiation which comes from the ground.
t is the front transmittance of the effective layer for a curved blind with thickness for direct radiation in the part which is directly passing through the blind without touching the slat at profile angle phi(s).
t is the front transmittance of the effective layer for a curved blind with thickness for direct radiation in the part which is incident on the slat at profile angle phi(s).
L is the radiation intensity of the diffuse radiation which comes from the sky.
L is the radiation intensity of the diffuse radiation which comes from the ground.