International Science Community Association Research Journal of Chemical Sciences 2231 - 606X 7 4 2017 04 18 Estimation of total solar radiation using RadEst 3.0 software at Dang, Nepal 8 13 EN Paul Barna 1 Research Centre, Department of Chemistry, Govt. V.Y.T. PG Autonomous College, Durg- 491001, C.G., India Tiwari Alka 2 Research Centre, Department of Chemistry, Govt. V.Y.T. PG Autonomous College, Durg- 491001, C.G., India K.C. Bed Raj 1 Mahendra Multiple Campus, Tribhuvan University, Nepalganj, Nepal > Research Paper 2016 11 16 2017 04 18 The RadEst 3.0 version software estimates total solar radiation using meteorological parameters such as precipitation, temperatures and solar radiation of Dang (Lat.28.7°N, Lon.82.18°E, and Alt.659m). The annual average daily global solar radiation is about 16.7 MJ/m2/day which is sufficient to generate the solar energy. Radiation is calculated as the product of the atmospheric transmissivity of radiation and radiation outside earth atmosphere. The model parameters are fitted in two years data. The values estimated by the models are compared with measured solar radiation data. The performance of the model was evaluated using root mean square error (RMSE), mean bias error (MBE), Coefficient of Residual Mass (CRM) and coefficient of determination (R2). The RadEst 3.0 software which showed the better results using BC, CD, DB and DCBB, among them the DB model is the best model for this site. The values of RMSE, MBE, CRM and R2 are 2.98, 1.27, 0.00 and 0.66 respectively. The finding coefficients of different models can be utilized for the estimation of solar radiation at the similar meteorological sites of Nepal. The result conformed that there is strong correlation of total solar radiation with altitude and local weather condition. Copyright@ International Science Community Association