Exergy Analysis of Solar Radiation Based on Measurement Data: A Study in Erzurum Province

In this study, the exergy potential of solar radiation energy is investigated using real measurement data such as average temperature and global solar radiation measured by the Erzurum/Tortum meteorology station between 2010 and 2021. Three different exergy models (Jeter, Spanner and Petela) are used to determine the region's global solar radiation exergy values. As a result of the analysis, the region's monthly average global solar radiation values are calculated as lowest in December with 6.92 MJ/m²-day and highest in July with 24.36 MJ/m²-day. The model-based long-term monthly average exergy-energy ratio is determined as 0.952897, 0.937196 and 0.937198 for Jeter, Spanner and Petela models, respectively. Among all models, the highest monthly and annual average global solar radiation exergy values are obtained with the Jeter model. Solar radiation exergy values of Spanner and Petela models are calculated the same. When the monthly average global solar radiation exergy values calculated according to the Jeter model are compared with the results of other models, the difference is maximum in August with 1.75%. Similarly, when comparing the annual average global solar radiation exergy values of Jeter and other models, the largest difference is in 2010 with 1.68%.