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FUEL-CELL AND HEAT-ENGINE ENERGY-CONVERSION COMPARATIVE ANALYSIS

Prof. M. Kostic Mechanical Engineering NORTHERN ILLINOIS UNIVERSITY. FUEL-CELL AND HEAT-ENGINE ENERGY-CONVERSION COMPARATIVE ANALYSIS. “ An Actual Engineering Topic ! ". Hydrogen Fuel Cell…. Chemical reaction. Maximum possible reversible work. Enthalpy of hydrogen formation or combustion.

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FUEL-CELL AND HEAT-ENGINE ENERGY-CONVERSION COMPARATIVE ANALYSIS

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  1. Prof. M. Kostic Mechanical Engineering NORTHERN ILLINOIS UNIVERSITY FUEL-CELL AND HEAT-ENGINE ENERGY-CONVERSION COMPARATIVE ANALYSIS “An Actual Engineering Topic!"

  2. Hydrogen Fuel Cell…

  3. Chemical reaction

  4. Maximum possible reversible work

  5. Enthalpy of hydrogen formation or combustion

  6. Efficiency of a hydrogen fuel-cell

  7. Efficiency of a hydrogen fuel-cell (2)

  8. Standard Formation Enthalpy (hf) and Gibbs Free Energy (gf) for Water-Vapor(g)and Water-Liquid(l) [in scale]. 100% 95% 83% 100%

  9. Maximum adiabatic combustion temperature

  10. Combustion entropy generation and work lost due to entropy generation (combustion irreversibility)

  11. Combustion Second Law efficiency (i.e., work availability, or exergy efficiency)

  12. Heat engine, constant Tadtemperature, ideal Carnot cycle

  13. Heat engine, constant and variabletemperature, ideal Carnot cycle

  14. Heat engine, constant temperatureCarnot cycle

  15. Heat engine, variable temperature, ideal Carnot cycle

  16. Conclusion

  17. Conclusion… ... the practical efficiencies are usually half of their theoretical limits, about 35% and 50% for heat engines and fuel cells, respectively. Still, further developments are needed to overcome fuel-cell limitations in low power density and competitive cost.

  18. NO SPEED LIMIT No Limits … The Future Belongs To… … Whoever Gets There First

  19. Prof. M. Kostic Mechanical Engineering NORTHERN ILLINOIS UNIVERSITY You may contact Prof. Kostic at: mailto:kostic@niu.edu or on the Web:www.kostic.niu.edu http://prof.mkostic.com

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