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    Performance evaluation of a geothermal and solar-based multigeneration system and comparison with alternative case studies: Energy, exergy, and exergoeconomic aspects
    (Pergamon-Elsevier Science Ltd, 2022) Guler, Omer Faruk; Sen, Ozan; Yilmaz, Ceyhun; Kanoglu, Mehmet
    This study modeled and analyzed the performance evaluation of a geothermal and solar-based multigeneration system and comparison with alternative case studies. For this purpose, three different models have been developed. In Model 1, a parabolic trough collector is used to transfer the energy in one stage. In Model 2, a parabolic trough collector transfers the heat in two stages. In Model 3, a system performs heat transfer with flat plate collectors in two stages. In addition, a hydrogen production system integrated into these models is also considered to store excess energy. These models are investigated for an existing region using geothermal and solar actual data from Afyonkarahisar in Turkey. The geothermal source is at a temperature of 130 degrees C and a flow rate of 85 kg/s. The solar incident varies between 400 and 1000 W/m2, with an average of 600 W/m2. The residual heat from the systems is used for residential heating. An electrolyzer and a fuel cell are integrated into the models. The costs of hydrogen and the conversion of electricity from hydrogen are investigated. When the exergy efficiencies are analyzed, they are 32.1%, 32.4%, and 30.6%. Hydrogen production costs of the models are calculated as 1.585 $/kg, 1.551 $/kg, and 1.585 $/kg. The conversion electricity costs of fuel cells are calculated as 0.0792, 0.0781, and 0.0792 $/kW, respectively.
  • [ X ]
    Öğe
    Thermodynamic modeling and analysis of a solar and geothermal assisted multi-generation energy system
    (Pergamon-Elsevier Science Ltd, 2021) Sen, Ozan; Guler, Omer Faruk; Yilmaz, Ceyhun; Kanoglu, Mehmet
    A geothermal and solar energy-assisted multi-generation energy system supplying electricity for the residences is modeled and analyzed. The system considered is a novel configuration consisting of a binary geothermal power plant and a parabolic trough concentrating solar power plant for electricity production and water electrolysis and fuel cell unit for hydrogen storage and utilization. Thermodynamic performance evaluation of the system is performed using Afyonkarahisar's geothermal and solar energy values. In Afyonkarahisar province, geothermal water temperature ranges between 70 and 130 degrees C and mass flow rate between 70 and 150 kg/s. Also, solar radiation incident varies between 300 and 1000 W/m(2). The geothermal and solar power plants could produce 2900 kW power. If this is used entirely for hydrogen production, 0.0185 kg/s hydrogen could be produced. One can produce 1615 kW power by using this hydrogen in the fuel cell. The overall system's energy and exergy efficiencies are calculated to be 5.90% and 18.99%, respectively. The system's parametric study is performed considering geothermal resource temperatures and solar radiation values on the power output and hydrogen production.