User talk:Debazitdatta

MODELING MONTHLY AVERAGE DAILY DIFFUSE RADIATION FOR DHAKA, BANGLADESH The split of total solar radiation on a horizontal surface into its beam and diffuse components is of interest in two contexts [1]. First, methods for calculating total radiation on surfaces of other orientation from data on a horizontal surface require separate treatments of beam and diffuse radiation. Second, estimates of the long time performance of most concentrating collectors must be based on estimates of availability of beam radiation. The empirical procedure of Liu and Jordan [2] involves a one parameter correlation between the diffuse to global ratio and the clearness index, K_t .From a detailed statistical analysis, Liu and Jordan discovered that a firm relationship exists between K_t  and the diffuse fraction.

The literature abounds with studies attempting to check, improve and extend this empirical correlation approach. Several authors have compared the original Liu and Jordan results with similar correlations obtained in other geographical areas [3-6]. The diffuse fraction has also been correlated with the number of hours of sunshine [7] and a combination of K_t and cloud cover. In this study, we have developed statistic model of the solar radiation highlighting the direct relationship between global solar radiation and its diffuse component. Seven years (2003-2010) of measured data of solar radiation were used for this purpose. The model is based on the clearness index〖 K〗_t. Finally, the model obtained for Dhaka, Bangladesh is compared with already established models for different locations of the world to achieve the better accuracy of the model.