GLOBAL SOLAR IRRADIATION AVERAGE MONTHLY HOURS (Hgh) WITH EMPIRICAL MODELS BASED ON AIR TEMPERATURE FOR MACEIÓ AND CORURIPE / ALAGOAS – BRAZIL
DOI:
https://doi.org/10.59627/cbens.2012.1871Keywords:
Global Solar irradiation hourly average monthly, Empirical Models, ModelingAbstract
In this study four empirical models, with the maximum and minimum air temperature as input variable, are adjusted to estimate the average hourly global solar irradiation monthly (Hgh) in the regions of Maceió (10°01’29,1”S, 36°16'29,1” W, 127m) and Coruripe (9°28’29,1”S, 35°49’43,6” W and 108.7 m). In the validation of the models were used meteorological data (air temperature) and solarimetric (Hgh) obtained in the period 2007 to 2009. The average hourly global solar irradiation estimated monthly (Hgeh) from the models were compared with values Hgh using statistical indicators: average deviations (med), population standard deviation of deviations (dpp), index of agreement of Willmott (d ) and t-test statistic. The adjusted coefficients were shown to be dependent on the region and the month in study. The coefficient β1 the models 1 (Hargreaves & Samani, 1982) and 2 (Annandale et al., 2002) showed the same pattern monthly in both regions. The coefficients β1 and β2 of the models 3 (Hargreaves et al., 1985) and 4 (Hunt et al., 1998) did not present month. For the Maceió’s region best estimate was obtained with model 1, indicating "d" ranging from 0,88 to 0,99, showing no significant difference at 1%. In the Coruripe’s region the model 3 was the best we estimated Hgh, with dpp ranging from 0,11 to 0,42 MJm-2. These results show the efficiency of empirical models to estimate Hgh.
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