Comparisons and critical assessment of global and diffuse solar irradiation estimation methodologies

Karaveli, Abdullah Bugrahan
Akınoğlu, Bülent Gültekin
Defining better methodologies of accurate predictions of the amount of monthly mean daily global and diffuse solar irradiation exposed is of utmost importance in order to determine the potential for utilizing the solar energy. This study compares and discusses the main methodologies, databases, and software that are used in estimating the solar irradiation to be used for the short- and long-term performances and feasibilities of solar energy systems, especially photovoltaic power plants in Turkey, and addresses the best one to be used to make the most accurate estimations. The comparisons are carried out between the recent methodologies developed by the authors, some models taken from the related literature that are concluded to be better, a widely used database, namely Meteonorm, and a widely used software, namely EU PVGIS. The reference data to develop the methodologies and to make comparison are provided from the State Meteorological Service of Turkey, which is the responsible body in Turkey to make measurements of solar irradiation. The comparisons are based on monthly mean daily values of global and diffuse solar irradiation and are carried out by statistical errors: mean bias error and root mean square error. The results showed that the methodology developed by the authors has shown better performances in estimating the monthly mean daily global and diffuse solar irradiation amount for Turkey.


Development of new monthly global and diffuse solar irradiation estimation methodologies and comparisons
Karaveli, Abdullah Bugrahan; Akınoğlu, Bülent Gültekin (Informa UK Limited, 2018-01-01)
In assessing and deciding the prediction schemes of solar irradiation countrywide, better the accuracy means better the management of energy transition toward renewables. Consequently, the present study is on the development of new models to make the most accurate possible estimations of the global and diffuse solar irradiation based on ground measurements. Such analysis produces the most accurate estimations for the input of solar energy systems. This is utmost significant for deciding the investments on s...
Statistical analysis of solar radiation data
Yilmaz, E.; Cancino, B.; Parra, W. R. (Informa UK Limited, 2007-01-01)
Solar radiation is the most important parameter in the design and study of solar energy conversion devices. The present work is based on statistical analysis of solar radiation data for the city of Valparaiso in the coast region of Chile. Experimental data were obtained from the Santa Maria University in Valparaiso over a five-year period measured by the actinograph and the pyranometer. The error between the actinography values in relation to the pyranometer ones was determined. The most frequent error perc...
Akınoğlu, Bülent Gültekin (Elsevier BV, 1990-01-01)
In this paper, a new correlation for the estimation of monthly average daily global solar radiation will be presented and compared with the correlations of Rietveld, Benson et al., Ögelman et al., and a recent formulation by Gopinathan. The overal results show that the quadratic form gives better performance in terms of global applicability. The new quadratic model should be preferred for the monthly average global solar radiation estimation when the data for bright sunshine hours are available
Technical and economic assessment of fixed, single and dual-axis tracking PV panels in low latitude countries
Bahrami, Arian; Okoye, Chiemeka Onyeka; Atikol, Ugur (Elsevier BV, 2017-12-01)
This study aims to contribute towards developing a sustainable roadmap for electrification program via solar energy deployment in 21 low latitude countries (0-15 degrees N) with limited access to the grid. Firstly, the available electrical energy from fixed, single and dual-axis solar tracking PV panels is demonstrated using a case study of nine selected locations in Nigeria. The annual electrical energy for the locations from a fixed 1-kW PV panel tilted at an optimal angle ranges from 1485 to 2024 kWh, wi...
Operating policies for energy generation and revenue management in single-reservoir hydropower systems
Ak, Mumtaz; Kentel Erdoğan, Elçin; Savaşaneril Tüfekci, Seçil (Elsevier BV, 2017-10-01)
We study the reservoir management problem in hydropower plants, and propose operating policies to maximize the average annual energy generation or the average annual revenue. Under revenue maximization, our policies allow for short-term electricity price variations to be incorporated into the long-term plan. First, we provide a detailed review of hydropower plant operation, focusing on implicit stochastic optimization approaches and integration of energy price variations in reservoir management. Then, we ex...
Citation Formats
A. B. Karaveli and B. G. Akınoğlu, “Comparisons and critical assessment of global and diffuse solar irradiation estimation methodologies,” INTERNATIONAL JOURNAL OF GREEN ENERGY, pp. 325–332, 2018, Accessed: 00, 2020. [Online]. Available: