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Abstract
Empirical models to estimate global solar radiation require the development of a set of equations that relate it to other meteorological parameters and from the monthly average daily value of clearness index and relative sunshine spanning of a period of 5 years, the Angstrom- Prescott model was developed for the estimation of global solar radiation of Ijebu-Ode (Lat. 6.81â°N. Long. 3.92â°E), a tropical region of Southern part of Nigeria. Regression analysis was done based on the season of the year and the results obtained were compared. The predictive efficacy in terms of mean bias error (MBE) and root mean square error (RMSE) of the model are also tested. The developed correlation model is expressed as with the correlation coefficient of 89.13%. The result obtained therefore seems to point to the fact that the Angstrom – Prescott model is locally dependable and rainy season model was found to be more satisfactory for the study area with MBE of 0.052 and RMSE of 6.240X107 Key words: Clearness index, global solar radiation, model, rainy season
Highlights
Development of solar energy research program must always start with a study of solar radiation data at a site or region of interest
The monthly average global solar radiation and sunshine duration for Ijebu - Ode has been used to determine the applicability of the Angstrom –type regression model for estimating the global irradiance from sunshine duration
The model developed has been found to be applicable in the seasonal period than the whole year for the station with r 0.5 0.9
Summary
Development of solar energy research program must always start with a study of solar radiation data at a site or region of interest. Measurement of solar radiation exists for only relatively few Meteorological stations and a place where it is not directly measured. It can be estimated by using models and empirical equations (Duffie and Beekman,1994). For the utilization of solar energy and balance studies, it is desirable to measure the diffuse global radiation and direct solar radiation (Sodha et al, 1986). The knowledge of daily and hourly record of the amount of sunshine is necessary for estimating global solar radiation using regression equation and for optimising the design of a particular solar collection. The direct correlation between global solar radiation and sunshine duration for a particular station is the regression equation between the solar global radiation and the temperature observed. The determination of correlation between the sunshine duration and global solar radiation is described by (1) called ANGSTROM FORMULA
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