Influence of heat– and mass–transfer coupling on the optimal performance of a non–isothermal chemical engine
Yanhua Cai, Guozhen Su*, and Jincan Chen
Department of Physics and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen 361005, People's Republic of China,*e–mail: gzsu@xmu.edu.cn.
Recibido el 5 de noviembre de 2009 ]]> Aceptado el 16 de junio de 2010
Abstract
The cyclic model of a non–isothermal chemical engine operated between two reservoirs with different temperatures and chemical potentials is established, in which the irreversibilities resulting from the heat and mass transfer between the working fluid and the reservoirs are taken into account. Expressions for the power output and efficiency of the engine are analytically derived and used to analyze the performance characteristics of the engine at the maximum power output. The general characteristics of the efficiency of the engine are searched in detail. The optimal criteria for some important parameters, such as the power output and efficiency, are obtained and the reasonably operating region of the engine is determined. Some interesting cases are specially discussed. The results obtained here can reveal the performance characteristics of a non–isothermal chemical engine affected by the irreversibilities of heat– and mass–transfer coupling.
Keywords: Chemical engine; heat– and mass–transfer coupling; irreversibility; maximum power output; optimum characteristic.
Resumen
Se establece el modelo cíclico de un motor químico no isotérmico operado entre dos reservorios a diferente temperatura y potencial químico, donde se toman en cuenta las irreversibilidades que son resultado de la transferencia de masa y calor entre el fluido de trabajo y los reservorios. Se obtienen analíticamente expresiones para la generación de poder y la eficiencia del motor y se utilizan para analizar las características de desempeño del motor cuando la generación de poder es máxima. Se hace una búsqueda detallada de las características de eficiencia del motor. Se obtienen criterios óptimos para algunos parámetros, tales como la generación de poder y la eficiencia, y se determina la región de operación razonable para el motor. Se discuten algunos casos de interés. Los resultados obtenidos revelan características de desempeño de un motor térmico no isotérmico afectado por irreversibilidades del acoplamiento de transferencia de masa y calor.
Descriptores: Motor químico; acoplamiento de transferencia de calor y masa; irreversibilidad; potencia máxima de salida; óptimo característico.
]]> PACS: 05.70.Ln; 07.20.Pe; 05.07.–a
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Acknowledgments
This work has been supported by the National Natural Science Foundation (No. 10875100), People's Republic of China.
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