کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
243996 501940 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Semi-empirical models for the estimation of clear sky solar global and direct normal irradiances in the tropics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی مهندسی انرژی و فناوری های برق
پیش نمایش صفحه اول مقاله
Semi-empirical models for the estimation of clear sky solar global and direct normal irradiances in the tropics
چکیده انگلیسی

This paper presents semi-empirical models for estimating global and direct normal solar irradiances under clear sky conditions in the tropics. The models are based on a one-year period of clear sky global and direct normal irradiances data collected at three solar radiation monitoring stations in Thailand: Chiang Mai (18.78°N, 98.98°E) located in the North of the country, Nakhon Pathom (13.82°N, 100.04°E) in the Centre and Songkhla (7.20°N, 100.60°E) in the South. The models describe global and direct normal irradiances as functions of the Angstrom turbidity coefficient, the Angstrom wavelength exponent, precipitable water and total column ozone. The data of Angstrom turbidity coefficient, wavelength exponent and precipitable water were obtained from AERONET sunphotometers, and column ozone was retrieved from the OMI/AURA satellite. Model validation was accomplished using data from these three stations for the data periods which were not included in the model formulation. The models were also validated against an independent data set collected at Ubon Ratchathani (15.25°N, 104.87°E) in the Northeast. The global and direct normal irradiances calculated from the models and those obtained from measurements are in good agreement, with the root mean square difference (RMSD) of 7.5% for both global and direct normal irradiances. The performance of the models was also compared with that of other models. The performance of the models compared favorably with that of empirical models. Additionally, the accuracy of irradiances predicted from the proposed model are comparable with that obtained from some rigorous physical models.


► New semi-empirical models for predicting clear sky irradiance were developed.
► The proposed models compare favorably with other empirical models.
► Performance of proposed models is comparable with that of widely used physical models.
► The proposed models have advantage over the physical models in terms of simplicity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Energy - Volume 88, Issue 12, December 2011, Pages 4749–4755
نویسندگان
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