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Optimization of thermoelectric topping combined steam turbine cycles for energy economy

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  • Yazawa, Kazuaki
  • Koh, Yee Rui
  • Shakouri, Ali

Abstract

A mismatch between the fuel combustion temperature ∼2250K (adiabatic) and the high pressure steam temperature up to 900K, results in a large amount of thermodynamic losses in steam turbine (ST) cycles. A solid-state thermoelectric (TE) placed on top of a ST cycle will produce additional electrical power. By selecting the right materials for the TE generator for high temperature operation, the energy production from the same fuel consumption will increase. Recent nano-structured enhancements to the thermoelectric materials could provide practical performance benefits. We carried out a theoretical study on the optimization of the interface temperature connecting these two idealized engines for energy economy as a combined system. We also analytically studied the optimum point-of-operation between the maximum power output for minimizing the payback and the maximum efficiency to obtain the maximum fuel economy for each generator. The economic optimum ends up in a significant reduction in energy cost ($/kWh). The combined TE topping generator system provides a lower energy cost for any period of operational life and higher interface temperature compared to the ST cycle alone. The maximum power output is observed at around 700K of interface temperature for 10,000h of operation, while the minimum energy production cost from the combined system is observed at over 900K with ZT=1.

Suggested Citation

  • Yazawa, Kazuaki & Koh, Yee Rui & Shakouri, Ali, 2013. "Optimization of thermoelectric topping combined steam turbine cycles for energy economy," Applied Energy, Elsevier, vol. 109(C), pages 1-9.
    • Handle: RePEc:eee:appene:v:109:y:2013:i:c:p:1-9
    DOI: 10.1016/j.apenergy.2013.03.050
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