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

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 ۱۶.۲%, while the exergy efficiency is ۵۴.۱%. This system is anticipated to produce hydrogen at a rate of ۰.۴ kg per hour, with a measured output power of ۱۰۵ kW. The analysis reveals that the work required for the hydrogen liquefaction cycle is ۷.۷۸۴ kW, and the total exergy destruction within the studied system amounts to ۳۴۳۷ kW. The economic analysis shows a total system cost of ۳۷.۶۰ per GJ, underscoring its strong financial viability. Additionally, the levelized cost of electricity generation is ۲۴.۵۸, and the levelized cost of hydrogen production is ۲۳.۹۲, further demonstrating the system's robust thermodynamic performance and economic feasibility.

کلیدواژه ها:

Claude cycle ، Ejector ، Heat Recovery ، Hydrogen ، Genetic algorithm