Thursday, August 24th, 2017

On modeling global solar irradiation using air temperature for Alagoas State, Northeastern Brazil

Publication date: Available online 5 June 2014
Author(s): Cícero Manoel Dos Santos , José Leonaldo De Souza , Ricardo Araujo Ferreira Junior , Chigueru Tiba , Rinaldo Oliveira de Melo , Gustavo Bastos Lyra , Iêdo Teodoro , Guilherme Bastos Lyra , Marco Antonio Maringolo Lemes
The present study assesses the performance of nine empirical models: the models of Bristow & Campbell and Hargreaves & Samani (together with their modified versions) in estimating the daily and monthly solar irradiation using just extraterrestrial solar irradiation and air temperature extremes (maximum and minimum) as input data. Two schemes to calculate the air temperature amplitudes (Δ T 1 and Δ T 2 ) were used. The data used in this study cover the period from 2007 to 2009 and were collected at eight solarimetric stations in Alagoas State (Northeastern Brazil); three are located in the interior, two in the hinterlands and three in the humid/coastal zones. Statistical parameters were used to evaluate the model performance. The estimates obtained with the Δ T 1 scheme are better than those using the Δ T 2 scheme for the interior (1.10%) and hinterlands (2.50%). The daily (0.160–0.201) and monthly (0.158–0.199) values of the coefficients of the original Hargreaves and Samani model did not show significant differences among them; this was not the case of Bristow and Campbell model. Have a special from the coastline (thermal amplitude, humidity and cloudiness) and altitude (bulk thermal capacity and optical depth of the atmosphere). On the daily basis, the original model of Hargreaves & Samani yields better estimates than those obtained with the Bristow & Campbell model: 2.30% (interior) and 5.20% (hinterlands). The latter had a better performance mainly for the sites along the humid/coastal zone (10.20%).

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