Title: Design and comparative analysis of a geothermal energy supported plant for tri-generation purposes

Authors: Nejat Tukenmez; Fatih Yilmaz; Murat Ozturk

Addresses: Department of Mechatronics Engineering, Faculty of Technology, Isparta University of Applied Sciences, 32200, Isparta, Turkey ' Department of Mechatronics Engineering, Faculty of Technology, Isparta University of Applied Sciences, 32200, Isparta, Turkey ' Department of Mechatronics Engineering, Faculty of Technology, Isparta University of Applied Sciences, 32200, Isparta, Turkey

Abstract: In this study, two geothermal-based energy systems that provide beneficial outputs of hydrogen, electricity and hot-water are proposed. In this study, two thermoelectric generators are included in the second system, unlike the first system, proposed to analyse the impact of thermoelectric generators on plant performance. For comprehensive thermodynamic and performance analysis of the proposed systems, the proposed systems are modelled according to thermodynamic equilibrium equations. The parametric works are performed to address the impact of different system indicators affecting the useful outputs and performance of the modelled systems. In addition, the performance evaluation of the modelled systems is conducted in comparison with several working fluids. The energetic and exergetic efficiencies of the designed first cycle are 40.4% and 31.57%, while the energetic and exergetic efficiencies of the suggested second cycle are found as 49.36% and 41.79%. The hydrogen generation realised by both proposed systems per unit time is 0.001196 kg/s.

Keywords: energy; exergy; geothermal energy; thermodynamic analysis; thermoelectric generator.

DOI: 10.1504/IJEX.2021.118710

International Journal of Exergy, 2021 Vol.36 No.2/3/4, pp.150 - 172

Received: 07 Sep 2020
Accepted: 08 Dec 2020
Published online: 03 Nov 2021 *

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