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<p>In the present study, a novel multi-generation system utilizing geothermal resources as an energy source for the production of electricity, heating, cooling, and liquid hydrogen has been developed. The proposed system integrates an organic Rankine cycle with a feedwater heater, an ejector-cascade cooling cycle, a proton exchange membrane electrolyzer unit, a dual flash geothermal source, and a Kapitza liquefaction cycle. This study introduces a new ejector-cascade precooling method employing two different refrigerants for the Kapitza liquefaction cycle. A comprehensive thermodynamic and economic analysis has been conducted on the system under investigation. Additionally, a parametric study has been performed to assess the impact of variations in key parameters on system efficiency across different operating conditions. The innovative arrangement developed in this study demonstrates effective coordination among its components, yielding commendable thermodynamic performance. The novelty aspect of the present work is based on the fact that a cascade-ejector precooling unit operating at two different operating temperatures has been used to reduce the energy consumption of the novel Kapitza hydrogen liquefaction unit. Specifically, the system achieves an energy efficiency of 30% and an exergy efficiency of 33%. The newly modeled liquefaction cycle exhibits a performance factor of 68%, with the exergy efficiency of this unit calculated to be 20.4%. To enhance the economic efficiency of the proposed system, the cost functions of the system components have been analyzed alongside economic variables, resulting in a total system cost of $39.13 per gigajoule.</p>

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Thermoeconomic Analysis of the Kapitza Cycle with Ejector-Cascade Precooling for Liquid Hydrogen Production in a Geothermal Based Multigeneration System

  • 期刊论文

  • 发表日期：

    2025年12月15日

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

摘要

In the present study, a novel multi-generation system utilizing geothermal resources as an energy source for the production of electricity, heating, cooling, and liquid hydrogen has been developed. The proposed system integrates an organic Rankine cycle with a feedwater heater, an ejector-cascade cooling cycle, a proton exchange membrane electrolyzer unit, a dual flash geothermal source, and a Kapitza liquefaction cycle. This study introduces a new ejector-cascade precooling method employing two different refrigerants for the Kapitza liquefaction cycle. A comprehensive thermodynamic and economic analysis has been conducted on the system under investigation. Additionally, a parametric study has been performed to assess the impact of variations in key parameters on system efficiency across different operating conditions. The innovative arrangement developed in this study demonstrates effective coordination among its components, yielding commendable thermodynamic performance. The novelty aspect of the present work is based on the fact that a cascade-ejector precooling unit operating at two different operating temperatures has been used to reduce the energy consumption of the novel Kapitza hydrogen liquefaction unit. Specifically, the system achieves an energy efficiency of 30% and an exergy efficiency of 33%. The newly modeled liquefaction cycle exhibits a performance factor of 68%, with the exergy efficiency of this unit calculated to be 20.4%. To enhance the economic efficiency of the proposed system, the cost functions of the system components have been analyzed alongside economic variables, resulting in a total system cost of $39.13 per gigajoule.