Coefficients of the first order and second order Angstrom model were obtained for Masvingo and Makoholi stations in Zimbabwe. Long term average ground measurements of sunshine hours and global horizontal solar radiation from the meteorological services were used as input data. Monthly average values of the clearness index, and the fraction of sunshine hours, were determined. Regression analysis was used to obtain the first and second order coefficients of the Angstrom model for the two locations. The estimates from the developed models were tested against measured values and results obtained were in agreement to within +/- 5%. The results also showed that the models performed better with these coefficients compared with coefficients suggested in previous researches. Also the first order model was found to perform better than the second order model for Makoholi station while the second order model works well for Masvingo.
Ahmed A, Akhla Que M, Ahmad F, Akhtar MW. Estimation of global and diffuse solar radiation for Hyderabad, Sindh, Pakistan. J Basic Appl Sci 2009; 5(2): 73-77. Available from: www.jbaas.com/html/Previous
Augustine C, Nnabuchi MN. Correlation between sunshine hours and global solar radiation in Warri, Nigeria. Pacific J Sci Technol 2009; 10(2). Available form: www.akamai-university.us/PJST10_2_574.pd
Kolebaje OT, Mustapha LO. On the performance of some predictive models for global solar radiation estimate in tropical stations: Port Harcourt and Lokoja The African Review of Physics 2012; 7: 0015 Available from: www.aphysrev.org/index.php/aphysrev/article/download/542/235
Bakirci K. Estimation of solar radiation by using ASHRAE clear-sky model in Erzurum, Turkey. Energy Sources, Part A, 2009; 31: 208-216 Available from: www.scribd.com
Hove T, Göttsche J. Mapping global, diffuse and beam solar radiation over Zimbabwe. Renewable Energy 1999; 18: 535-56 Available from: www.sciencedirect.com/science/journal/ 09601481/18 http://dx.doi.org/10.1016/S0960-1481(98)00782-4
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