Thermodynamic, Economic and Optimization Analysis of a New Geothermal Energy-Based Multiple Generation System for Hot Water, Cooling, Power and Liquid Hydrogen Production

Document Type : Original Article

Authors
ali eyvazi 1
mehran ameri 2
mohammad Shafiey Dehaj 3
hadi ghaebi 4
1 Ph.D. Student, Department of Mechanical Engineering, Faculty of Engineering, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
2 Professor, Department of Mechanical Engineering, Faculty of Engineering, Bahonar University of Kerman, Kerman, Iran.
3 Associate Professor, Department of Mechanical Engineering, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran.
4 Professor, Department of Mechanical Engineering, Faculty of Engineering, University of Mohaghegh Ardabili, Ardebil, Iran
10.22034/stme.2025.490141.1089
Abstract
In this study, a new geothermal energy-based multiple generation system is investigated. This system consists of a modified organic Rankine cycle, a single-effect absorption chiller, and a hydrogen liquefaction cycle that produces power, heat, cold, and liquid hydrogen. In the proposed system, by using geothermal energy as the primary energy source required for liquid hydrogen production, environmental pollution is minimized. The hydrogen gas produced by the electrolyzer in the proposed system is pre-cooled by an absorption heat transformer, and the power consumption of the hydrogen liquefaction cycle is reduced. In the present study, the effect of changes in important performance parameters on the system performance is evaluated. In addition, the optimal performance of the system is investigated using a two-objective genetic algorithm, and the optimal point of the system is obtained using the TOPSIS decision criterion. A complete thermodynamic analysis is performed in the present study, and the results show that an energy efficiency of 42% and an exergy efficiency of 51% are obtained for the proposed system. The economic evaluation conducted in the present study using updated cost functions shows that the total cost of the multiple generation system is $16.37/GJ, which demonstrates the high economic justification of the proposed system.
Keywords
Geothermal energy
hydrogen cloud liquefaction cycle
multiple production system
optimization
modified organic Rankine cycle
Subjects
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  • Receive Date 22 November 2024
  • Revise Date 31 December 2024
  • Accept Date 08 January 2025
  • First Publish Date 08 January 2025
  • Publish Date 21 September 2024