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    Öğe
    Analysis of integrated energy system coupling small modular reactor with renewable energy sources
    (Inderscience Enterprises Ltd, 2025) Koca, Gulcan; Sozen, Adnan
    As renewable energy systems (RESs) are highly variable and depend on geographical conditions, they are considered along with thermal energy systems as hybrid systems. In the study, small modular nuclear reactor (SMR), parabolic trough collector (PTC), and wind energy are integrated to produce more reliable electricity. PTC is used to heat the main flow, while wind energy is used for the self-consumption of the proposed system. Total increments of 8.8% in the electricity generation, and between 17-51 MW wind energy are achieved. The efficiency of the proposed system is 33.48%. The proposed system is 2.7% more efficient than the SMR system.
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    Öğe
    Exergy Calculations and Refrigerant Selection Using Flue Gas Waste Heat in Organic Rankine Cycle
    (Gazi Univ, 2025) Saru, Muhsine; Sozen, Adnan; Pulat, Erhan
    In this study, the second law efficiency of the organic Rankine cycle (ORC) designed was calculated for each of refrigerants, and the exergies of the ORC components were examined separately. Candidate refrigerants were determined for comparison. When determining candidate refrigerants, the first thing to consider was the low boiling point temperature. Five candidate refrigerants were determined for comparison purposes, namely R290, R600a, R32, R125, R143a. When determining candidate refrigerants, importance was given to the criterion that their boiling temperature should be lower than the boiling temperature of water. The refrigerant with the highest exergy efficiency was selected as the most suitable refrigerant among the candidate refrigerants. The temperature of sink has been taken as a value that lower than the boiling point temperature o the refrigerant that has the lowest boiling point temperature among the others instead of ambient temperature.The power generation, first law efficiency and second law efficiency of R32were found to be 170,3 kJ/kg, 0,3049 and 0,284, respectively.The thermal efficiency and second law efficiency values of the ORC using R32 are higher than those using other refrigerants for conditions in the considered textile plant.
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    Öğe
    Numerical and experimental analysis of a water cooled photovoltaic-thermal system using modified tubes
    (Pergamon-Elsevier Science Ltd, 2025) Variyenli, Halil Ibrahim; Yousefi, Maryam; Tuncer, Azim Dogus; Sozen, Adnan; Goksel, Bedirhan Cagri; Khanlari, Ataollah
    Photovoltaic (PV) panels often experience reduced electrical efficiency due to high operating temperatures, making effective cooling techniques critical for performance enhancement. This study investigates the overall performance of a water-cooled photovoltaic-thermal (PVT) system featuring a novel cooling tube design aimed at increasing the contact surface area between the PV module underside and cooling tubes to improve heat transfer. To achieve this, conventional circular tubes were modified into an elliptical shape with a flat surface to enhance thermal contact. Accordingly, the performance of the designed PVT system has been experimentally examined at different conditions and compared with a PV panel with the same specifications. Additionally, overall behavior of the PVT system has been numerically simulated and compared with experimental one. Experimentally obtained results exhibited successful design of the PVT system when compared to standalone PV panel. The highest electrical efficiency for the standalone PV obtained as 16.13 %. The maximum electrical efficiency for the PVT system achieved as 17.57 %. Additionally, the highest overall efficiency of the PVT was obtained as 69.38 %. Moreover, average deviation between numerically and experimentally achieved results obtained as 3.2 %. These findings indicate the potential of the proposed cooling tube design to enhance the thermal and electrical performance of PVT systems.