ABSTRACT
In the previous sections, models for incident horizontal diffuse and global irradiation and illuminance were discussed. Having obtained these quantities, the next step is to obtain the incident slope beam and diffuse energy. Diffuse irradiance or illuminance on any sloping surface consists of sky-diffuse and ground-reflected components. While the latter will be discussed at length in Chapter 6, the former, i.e. sky-diffuse component, will be discussed presently.
