Optical properties of the effective layer for diffuse radiation considered in this study are the front transmittance of the effective layer for diffuse radiation, T, the front reflectance of the effective layer for diffuse radiation, p and the front absorptance of the effective layer for diffuse radiation, x .
The diffuse radiation is reaching the blind from every direction, both downward from the sky and upward from the ground. Since the diffuse radiation from the sky and from the ground can have different values, therefore, the optical properties for diffuse radiation are separated into properties calculated from the sky radiation and properties calculated from the ground
reflected radiation.
The optical properties for diffuse radiation can be determined by integrating the optical properties obtained from the direct radiation in a single direction over the sky or ground elements.
The distribution of the diffuse radiation from the sky and ground element incident on the blind as function of the solar profile angle is shown in Fig. 6.
The expressions for the transmittance of the effective layer for diffuse radiation can be written as components from the sky and from the ground.
They are expressed as
Optical properties of the effective layer for diffuse radiation considered in this study are the front transmittance of the effective layer for diffuse radiation, T, the front reflectance of the effective layer for diffuse radiation, p and the front absorptance of the effective layer for diffuse radiation, x .The diffuse radiation is reaching the blind from every direction, both downward from the sky and upward from the ground. Since the diffuse radiation from the sky and from the ground can have different values, therefore, the optical properties for diffuse radiation are separated into properties calculated from the sky radiation and properties calculated from the groundreflected radiation. The optical properties for diffuse radiation can be determined by integrating the optical properties obtained from the direct radiation in a single direction over the sky or ground elements. The distribution of the diffuse radiation from the sky and ground element incident on the blind as function of the solar profile angle is shown in Fig. 6. The expressions for the transmittance of the effective layer for diffuse radiation can be written as components from the sky and from the ground. They are expressed as
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