A simple model to predict solar radiation under clear sky conditions

摘要: Abstract Solar radiation is one of the major factors that dominate thermal behaviors aerostats in daytime and primary energy source high altitude long endurance aerostats. Therefore, it necessary to propose an accurate model predict solar irradiances. A comprehensive review well-known models conducted help develop new model. Based on analysis existing available data, extensive computer tests regression optimization are conducted, from which for direct diffuse irradiances under clear sky conditions proposed. The has excellent prediction accuracy. coefficient determination 0.992, with root mean square error (RMSE) 16.9 W/m 2 absolute (MAE) 2.2%. 0.86, RMSE = 8.7 W/m MAE = 9.9%. Comparisons show much more than best ones.