A semi-empirical model for calculating spectral global solar irradiance under clear sky conditions in Thailand
Keywords:
global solar irradiance, spectrum, clear sky, model, thailandAbstract
This paper presents the development of a semi-empirical model for calculating spectral global solar irradiance in Thailand. The model expresses the spectral global solar irradiance as an empirical function of atmospheric constituents affecting radiation. To develop the model, global solar spectral irradiance was measured at Chiang Mai (18.78°N, 98.98°E), Ubon Ratchathani (15.25°N, 104.87°E), Nakhon Pathom (13.82°N, 100.04°E) and Songkhla (7.18°N, 100.60°E). Five years (2017-2021) of spectral data from these locations were collected and separated into two groups. The first group (2017-2020) was used for modeling while the second group (2021) was employed for model validation. The validation results revealed that the values of spectral global irradiance calculated from the model and those obtained from the measurements were in good agreement with the discrepancy in terms of mean bias difference and root mean square difference of 0.98% and 9.61%, respectively. These results imply that the developed model performs well in calculating spectral global solar irradiance.
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