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<p>This assessment deals with a comprehensive, renewable, multi-generation energy system, encompassing geothermal subsystems, a modified organic Rankine cycle, a proton exchange membrane electrolyzer, a single-effect absorption chiller, and a hydrogen liquefaction cycle. In the present study, the recovery of thermal losses from the turbine, along with its preheating and direct application to supply energy for the hydrogen production unit, represents the distinguishing and innovative feature of the proposed system compared to previous configurations. The proposed system is examined from a wide range of aspects, and its efficiency is evaluated using key performance measures. Furthermore, a case study was executed to assess the system’s operation under specific circumstances. Energy efficiency, exergy, and economic factors were used to assess the performance of the proposed system. The implications of varying operational conditions on system efficiency were investigated through a sensitivity analysis. In this study, a two-objective genetic algorithm, in conjunction with the TOPSIS decision-making method, was implemented to optimize the proposed hydrogen production system. The thermodynamic analysis of the system reveals an energy efficiency of 45% and an exergy efficiency of 53%. The system is anticipated to produce hydrogen at a rate of 4.88&#xa0;kg/h, yielding an output power of 1425&#xa0;kW. The hydrogen liquefaction cycle requires 13.77&#xa0;kW of work, while the total exergy destruction of the system amounts to 56,140&#xa0;kW. The financial viability of the system is substantiated by its cost-effectiveness, as an economic analysis reveals a total cost of 37.16 $/h. The levelized cost of electricity generation is 1.98 cents/kWh, and the levelized cost of hydrogen production is 2.439 $/kg. The system attains optimal performance by reducing energy consumption during liquid hydrogen production, a reduction achieved through pre-cooling with an absorption chiller and immersion in a liquid nitrogen bath.</p>

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Energy, Exergy, and Economic Analysis and Optimization of a Novel Geothermal Energy-Based Multigeneration System for Liquid Hydrogen, Hot Water, Cooling, and Power Production

  • 期刊论文

  • 发表日期：

    2025年10月26日

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  • Ali Eyvazi,
  • Mehran Ameri,
  • Mohammad Shafiey Dehaj,
  • Hadi Ghaebi

摘要

This assessment deals with a comprehensive, renewable, multi-generation energy system, encompassing geothermal subsystems, a modified organic Rankine cycle, a proton exchange membrane electrolyzer, a single-effect absorption chiller, and a hydrogen liquefaction cycle. In the present study, the recovery of thermal losses from the turbine, along with its preheating and direct application to supply energy for the hydrogen production unit, represents the distinguishing and innovative feature of the proposed system compared to previous configurations. The proposed system is examined from a wide range of aspects, and its efficiency is evaluated using key performance measures. Furthermore, a case study was executed to assess the system’s operation under specific circumstances. Energy efficiency, exergy, and economic factors were used to assess the performance of the proposed system. The implications of varying operational conditions on system efficiency were investigated through a sensitivity analysis. In this study, a two-objective genetic algorithm, in conjunction with the TOPSIS decision-making method, was implemented to optimize the proposed hydrogen production system. The thermodynamic analysis of the system reveals an energy efficiency of 45% and an exergy efficiency of 53%. The system is anticipated to produce hydrogen at a rate of 4.88 kg/h, yielding an output power of 1425 kW. The hydrogen liquefaction cycle requires 13.77 kW of work, while the total exergy destruction of the system amounts to 56,140 kW. The financial viability of the system is substantiated by its cost-effectiveness, as an economic analysis reveals a total cost of 37.16 $/h. The levelized cost of electricity generation is 1.98 cents/kWh, and the levelized cost of hydrogen production is 2.439 $/kg. The system attains optimal performance by reducing energy consumption during liquid hydrogen production, a reduction achieved through pre-cooling with an absorption chiller and immersion in a liquid nitrogen bath.