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Finite-time heat-transfer analysis and generalized power-optimization of an endoreversible Rankine heat-engine

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  • Khaliq, Abdul

Abstract

This paper reports the results of a study carried out for the power optimization of a Rankine-cycle heat-engine using finite-time thermodynamic theory. This study extends the recent flurry of publications in heat-engine efficiency under the maximum power condition by incorporating the optima of heat conductance and heat capacitance ratios. While maximizing the instantaneous power output, it is shown that there is an optimum balance between the sizes of heat exchangers, between the heat capacity rates of heating and cooling fluid as well as temperature differences between the engine and thermal reservoirs. The results indicate that power output increases significantly with the increase in heat capacity rate of the heating fluid, but the thermal efficiency at maximum power remains constant. The effects of thermal conductance of the hot-side heat-exchanger on the power output and thermal efficiency are insignificant. The theoretical efficiency formulated in this study is much closer to that actually observed in well-designed power plants.

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  • Khaliq, Abdul, 2004. "Finite-time heat-transfer analysis and generalized power-optimization of an endoreversible Rankine heat-engine," Applied Energy, Elsevier, vol. 79(1), pages 27-40, September.
    • Handle: RePEc:eee:appene:v:79:y:2004:i:1:p:27-40
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    References listed on IDEAS

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    1. Wu, Chih, 1988. "Power optimization of a finite-time Carnot heat engine," Energy, Elsevier, vol. 13(9), pages 681-687.
    2. Blank, David A. & Davis, Gregory W. & Wu, Chih, 1994. "Power optimization of an endoreversible stirling cycle with regeneration," Energy, Elsevier, vol. 19(1), pages 125-133.
    3. Lee, Won Y. & Kim, Sang S. & Won, Seung H., 1990. "Finite-time optimizations of a heat engine," Energy, Elsevier, vol. 15(11), pages 979-985.
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    Cited by:

    1. Sogut, Oguz Salim & Durmayaz, Ahmet, 2005. "Performance optimization of a solar driven heat engine with finite-rate heat transfer," Renewable Energy, Elsevier, vol. 30(9), pages 1329-1344.
    2. Khaliq, Abdul & Kumar, Rajesh, 2005. "Finite-time heat-transfer analysis and ecological optimization of an endoreversible and regenerative gas-turbine power-cycle," Applied Energy, Elsevier, vol. 81(1), pages 73-84, May.
    3. Sahin, Bahri & Ust, Yasin & Yilmaz, Tamer & Akcay, Ismail Hakki, 2006. "Thermoeconomic analysis of a solar driven heat engine," Renewable Energy, Elsevier, vol. 31(7), pages 1033-1042.
    4. Wu, Lanmei & Lin, Guoxing & Chen, Jincan, 2010. "Parametric optimization of a solar-driven Braysson heat engine with variable heat capacity of the working fluid and radiation–convection heat losses," Renewable Energy, Elsevier, vol. 35(1), pages 95-100.

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