Title: Exergy and energy analysis of a solid oxide fuel cell-gas turbine-supercritical CO₂ hybrid system: economic and environmental assessment

Authors: Divya Tiwari; Pushpraj Singh; Abhay Agrawal; Prashant Singh Chauhan

Addresses: Department of Mechanical Engineering, Rewa Engineering College, University Road, Rewa, Madhya Pradesh, 486002, India ' Department of Mechanical Engineering, Rewa Engineering College, University Road, Rewa, Madhya Pradesh, 486002, India ' Department of Mechanical Engineering, Rewa Engineering College, University Road, Rewa, Madhya Pradesh, 486002, India ' Department of Mechanical Engineering, Rewa Engineering College, University Road, Rewa, Madhya Pradesh, 486002, India

Abstract: As global energy demand rises due to population growth and industrialisation, efficient power generation is essential. This study develops a hybrid power system integrating a supercritical CO₂ (sCO₂) cycle, solid oxide fuel cell (SOFC), and gas turbine (GT). Using computational analysis, the system's energy, exergoeconomic, and environmental performance was evaluated. Results showed a 7.19% increase in efficiency and power output compared to the conventional SOFC-GT system, with a 7.39% reduction in CO₂ emissions. Despite a 2.17% cost enhance, the hybrid system offers superior efficiency and sustainability. Overall, proposed hybrid system offers enhanced efficiency and environmental benefits over traditional configurations.

Keywords: gas turbine; GT; supercritical CO₂ cycle; thermo-economic analysis; CO₂ emission analysis; SOFC; exergy.

DOI: 10.1504/IJEX.2025.147744

International Journal of Exergy, 2025 Vol.47 No.4, pp.261 - 278

Received: 06 Feb 2025
Accepted: 07 Apr 2025
Published online: 29 Jul 2025 *

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