Thermoeconomic Analysis and Optimization of a Novel Geothermal based Multi Generation System for Electricity Generation, Cooling, Heating and Hydrogen Liquefaction

Document Type : Full Length Research Article

Authors

1 Department of Mechanical Engineering, Faculty of Engineering, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran

2 Department of Mechanical Engineering, Faculty of Engineering, Shahid bahonar University of Kerman, Kerman, Iran

3 Department of Mechanical Engineering, Faculty of Engineering, University of Mohaghegh Ardabili, Ardabi, Iran

Abstract

This evaluation presents an integrated, renewable multi generation system powered by geothermal energy. The system incorporates a double-flash geothermal unit, two ejector cooling cycles, a proton exchange membrane electrolyzer, an absorption precooling cycle, and a Claude hydrogen liquefaction subsystem. The study investigates a geothermal-based multi generation system utilizing a double-flash cycle to generate power, provide cooling capacity, and produce liquefied hydrogen. The performance of the proposed system is assessed based on energy, exergy, and economic factors. A case study analyzed the system's behavior under specific conditions. Additionally, a sensitivity analysis was performed to understand how varying operating conditions impacted the system's performance. Finally, a two-objective genetic algorithm, combined with the TOPSIS decision-making method, was employed to optimize the proposed system. The results of the thermodynamic evaluation indicate that the energy efficiency of the proposed system is 16.2%, while the exergy efficiency is 54.1%. This system is anticipated to produce hydrogen at a rate of 0.4 kg per hour, with a measured output power of 105 kW. The analysis reveals that the work required for the hydrogen liquefaction cycle is 7.784 kW, and the total exergy destruction within the studied system amounts to 3437 kW. The economic analysis shows a total system cost of $37.60 per GJ, underscoring its strong financial viability. Additionally, the levelized cost of electricity generation is 24.58, and the levelized cost of hydrogen production is 23.92, further demonstrating the system's robust thermodynamic performance and economic feasibility.

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References

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History

  • Receive Date: 29 November 2024
  • Revise Date: 14 January 2025
  • Accept Date: 15 February 2025

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