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Summary

This study integrates solid oxide fuel cells (SOFCs) with Stirling engines and proton exchange membrane electrolyzers (PEMEs) to optimize hydrogen production. The integrated system enhances energy efficiency and reduces costs for a sustainable power generation solution.

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BiofuelBiomassFuel cellMulti-objective optimizationOptimizationWaste energy

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Area of Science:

  • Energy Systems Engineering
  • Thermodynamics
  • Sustainable Energy

Background:

  • Solid oxide fuel cells (SOFCs) offer eco-friendly power generation but face challenges in hydrogen fuel supply.
  • Integrated systems are crucial for enhancing the efficiency and economic viability of fuel cell technologies.

Purpose of the Study:

  • To design and evaluate an integrated system comprising SOFC, Stirling engine, and proton exchange membrane electrolyzer (PEME).
  • To optimize the system for higher energy and exergy efficiency while minimizing costs.
  • To assess the system's performance in terms of thermodynamics, economics, and hydrogen production.

Main Methods:

  • Analysis of three integrated system models using energy, exergy, and exergoeconomic assessments.
  • Component validation against data from related studies.
  • Optimization based on exergy efficiency, total cost, and hydrogen production rate.

Main Results:

  • Model (b) achieved the lowest total cost ($27.48/GJ) and highest energy efficiency (51.51%) and exergy efficiency (33.09%).
  • Optimal conditions include a current density of 2708 A/m², utilization factor of 0.84, and specific blower pressure ratios.
  • The optimized system can produce 138.2 kg/day of hydrogen at an overall product cost of $57.58/GJ.

Conclusions:

  • The proposed integrated system demonstrates strong thermodynamic, environmental, and economic performance.
  • Integration of SOFC, Stirling engine, and PEME is a viable strategy for efficient hydrogen production and power generation.
  • The study provides an optimized design for sustainable energy solutions.