Investigación

 

Exergoeconomic performance optimization for an endoreversible regenerative gas turbine closed–cycle cogeneration plant

 

Guisheng Tao, Lingen Chen*, and Fengrui Sun

 

Postgraduate School, Naval University of Engineering, Wuhan 430033, P.R. China.

 

*To whom all correspondence should be addressed.
Fax: 0086–27–83638709
Tel: 0086–27–83615046
e–mail: lgchenna@yahoo.com, lingenchen@hotmail.com

 

Recibido el 9 de febrero de 2009
Aceptado el 13 de mayo de 2009

 

Abstract

Finite time exergoeconomic performance of an endoreversible regenerative gas turbine closed–cycle cogeneration plant coupled to constant temperature heat reservoirs is investigated. The analytical formulae about profit rate and exergy efficiency of the cogeneration plant with the heat resistance losses in the hot–, cold– and consumer–side heat exchangers and the regenerator are deduced, respectively. By means of numerical calculations, the heat conductance allocation among the four heat exchangers and pressure ratio of the compressor are optimized by taking the maximum profit rate as the objective. The characteristic of optimal dimensionless profit rate versus corresponding exergy efficiency is investigated and the effects of design parameters on optimal performance of the cogeneration plant are also analyzed. The results show that there exist a sole group of optimal heat conductance allocations among the four heat exchangers and an optimal pressure ratio of the compressor which lead to the maximum dimensionless profit rate, and there exists an optimal consumer–side temperature which leads to double–maximum dimensionless profit rate.

Keywords: Finite time thermodynamics; gas turbine cycle cogeneration plant; exergoeconomic performance; profit rate.

 

Resumen

Se investigó el desempeño en tiempo finito de una planta de cogeneración de gas turbina endoreversible regenerativo de ciclo cerrado acoplado con una reserva de temperatura termal constante. Se deduce la formula analítica para la razon de ganancia y eficiencia de energía de la planta de cogeneración con las perdidas de resistencia en calor, frío y lado–consumidor intercambiadores termales y regeneradores, respectivamente. Mediante cálculos numéricos, la asignación de conductor termal entre los cuatro intercambiadores termales y de taza de presión del compresor es optimizada tomando como objetivo la máxima taza de ganancia. Se investiga las características de las dimensiones óptimas de taza de ganancia versus la energía eficiencia correspondiente, así como los efectos de los parámetros sobre el desempeño óptimo de la planta de cogeneración. Los resultados demuestran que existe un solo grupo de óptimo de conductores termales entre los cuatro intercambiadores y una de taza de presión del compresor optima que resultan en las dimensiones máximas de la taza de ganancia, y que existe una temperatura optima de lado–consumidor que resulta con una taza de ganancia de dimensiones doble–máxima.

Descriptores: Termodinámica de tiempo finito; desempeño exorgoeconómico.

 

PACS: 05.70.–a; 84.60.–h

 

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Acknowledgments

This paper is supported by The Program for New Century Excellent Talents of P.R. China (Project No. NCET–04–1006) and The Foundation for the Author of National Excellent Doctoral Dissertation of P.R. China (Project No. 200136). The authors wish to thank the reviewer for his careful, unbiased and constructive suggestions, which led to this revised manuscript.

 

A Nomenclature

 

B Greek symbols

 

Subscripts

 

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