Estimation of direct normal irradiance from measured global and corrected diffuse horizontal irradiance

Heating Rate of Light Absorbing Aerosols: Time-Resolved Measurements, the Role of Clouds, and Source Identification

“…Diffuse radiation was measured using another DPA154 radiometer coupled with a shadow band. The shadowband effect was corrected following the work of Kotti et al allowing determination of the true diffuse radiation and, as a consequence, the direct one (after subtraction from the global). The radiometer measurements were used to determine the cloud fraction in terms of oktas (amount of cloud cover in terms of of sky coverage) according to the work of Ehnberg and Bollen .…”

Computations of diffuse fraction of global irradiance: Part 1 – Analytical modelling

“…In general, global tilted irradiance is computed as the sum of the beam component of direct irradiance on the tilted surface, diffuse tilted and reflected irradiance. These three components can be calculated by computational formulas, given the global horizontal (G) and diffuse (G d ) irradiance and surface albedo; beam irradiance can be computed as a function of G, G d and the incidence angle of the sun (Baker, 1984;Kotti et al, 2014).…”

Modeling of the hourly horizontal solar diffuse radiation in Sanliurfa, Turkey

“…Muneer et al [29] proposed 14 diffuse radiation models based on the relationship between diffuse radiation rate and clarity index taken from the NASA measurement data for 14 locations between 13° and 59° latitudes. Kotti et al [30] compared four diffusive radiation correction models to eliminate diffuse radiation calculation errors affecting direct radiation calculation. Li et al [31] evaluated the change in solar radiation components using statistical parameters by using direct, diffuse and total solar radiation measurement data obtained from Hong Kong between 2008 and 2012.…”