广义不可逆布雷森循环生态学性能系数分析

Performance Analysis of Ecological Coefficient of Generalized Irreversible Braysson Cycle

以反映热机循环输出和损失之比的生态学性能系数(ECOP)为目标,用有限时间热力学理论,对广义不可逆布雷森循环进行性能分析。导出了在牛顿传热律下广义不可逆布雷森循环无因次功率、效率、无因次熵产率、无因次生态学函数和生态学性能系数的解析式;并通过数值算例得到它们之间的关系。结果表明,内不可逆性对该热机各种性能参数产生一定的影响,以ECOP为目标优化具有效率较高,熵产率较低的优势。

In this paper, the ecological coefficient of performance （ECOP） criteria （ ratio of the exergy output to exergy loss ） of a generalized irreversible Braysson cycle is analyzed by using finite-time thermodynamics. The analytical formulae about dimensionless power output, efficiency, dimensionless entropy generation rate, dimensionless ecological function and ECOP of the generalized irreversible Braysson cycle are derived with the Newtonian transfer law. And the relations among them are studied by detailed numerical example. The results indicate that the internal irreversibility has influence on the performance parameters of the engine, and ECOP criterion has a significant advantage in smaller entropy-generation rate and higher thermal efficiency.