Prediction of Direct and Diffuse Solar Radiation on Pokhara, Nepal

The measurement of direct and diffuse solar radiation is not easily possible because instruments are quite expensive. The main objective of this study was to predict direct solar radiation (IB) and diffuse solar radiation (ID) on Pokhara (28.186643o N, 83.97518o E, 800 m asl) for a period of one year (2017). Daily data of spectral Aerosol optical depth (AOD) and total ozone column are obtained from NASA website. The maximum value of direct solar radiation and diffuse solar radiation values were found 932.9 ± 65.9 W/m2 in January and 363.0 ± 87.9 W/m2 in February respectively. The minimum value of direct solar radiation and diffuse solar radiation values were found 692.8 ±142.0 W/m2 in April and 107.7 ± 20.4 W/m2 in July respectively. The diffuse solar radiation changes with season. The annual average of direct solar radiation and diffuse solar radiation are found 808.1± 133.7 W/m2 and 220.8 ± 102.8 W/m2 and respectively. The results of this research work will help further identification, impact and analysis of solar radiation in different locations in Nepal with the same geographic conditions. 

[1]  I. B. Karki,et al.  Estimation of Direct and Diffuse Solar Radiation on Bode, Bhaktapur , 2022, Journal of Nepal Physical Society.

[2]  I. B. Karki,et al.  Estimation of Direct Solar Radiation on High Mountain Region, Jomson, Nepal , 2022, Patan Prospective Journal.

[3]  Lunche Wang,et al.  Prediction of diffuse solar radiation based on multiple variables in China , 2019, Renewable and Sustainable Energy Reviews.

[4]  Wei Gong,et al.  Analysis of atmospheric turbidity in clear skies at Wuhan, Central China , 2017, Journal of Earth Science.

[5]  Youcef Messlem,et al.  Estimation of the daily global solar radiation based on Box–Jenkins and ANN models: A combined approach , 2016 .

[6]  K. Poudyal.  Estimation of Global Solar Radiation using Modifed Angstrom Empirical formula on the basis of Meterological parameters in Himalaya Region Pokhara, Nepal , 2016 .

[7]  B. Bhattarai,et al.  Solar Energy Potential in Nepal and Global Context , 2014 .

[8]  Pasquale Daponte,et al.  Estimation of the daily global solar radiation; Nepal experience , 2013 .

[9]  Binod K. Bhattarai,et al.  Estimation of Global Solar Radiation Using Clearness Index and Cloud Transmittance Factor at Trans-Himalayan Region in Nepal , 2012 .

[10]  Daniele Bortoli,et al.  Temporal and spatial variabilities of total ozone column over Portugal , 2011 .

[11]  R. Bintanja.  The Parameterization of Shortwave and Longwave Radiative Fluxes for Use in Zonally Averaged Climate Models , 1996 .

[12]  R. Bird,et al.  Simplified clear sky model for direct and diffuse insolation on horizontal surfaces , 1981 .

[13]  Angelika Bayer,et al.  Solar Engineering Of Thermal Processes , 2016 .

[14]  F. Bason.  Diffuse Solar Irradiance and Atmospheric Turbidity , 2007 .

[15]  T. C. Majupuria,et al.  Nepal, nature's paradise: Insight into diverse facets of topography, flora & ecology , 1999 .

[16]  M. Iqbal.  An introduction to solar radiation , 1983 .

[17]  G. Lothian.  Beer's law and its use in analysis. A review , 1963 .