具有热阻、热漏的不可逆布雷森循环生态学性能新析

New ecological performance analysis of irreversible braysson cycle with heat resistance and heat leakage

以反映热机循环输出火用和火用损失之比的生态学性能系数为目标,用有限时间热力学的方法分析具有热阻、热漏的不可逆布雷森循环性能。导出了在牛顿传热律下布雷森循环无因次功率、效率、无因次熵产率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:对比生态学目标E,循环在最大生态学性能系数ECOP下工作时,其相应的熵产率和热效率有明显优势。

The ecological coefficient of performance （ECOP） criteria （ratio of the exergy output to exergy loss） of an irreversible Braysson cycle with heat resistance and heat leakage is analyzed in this paper by using finite- time thermodynamics. The analytical formulae about dimensionless power output, efficiency, dimensionless entropy generation rate and ECOP of the irreversible Braysson cycle are derived. And the relations among them are studied by detailed numerical examples. The results indicate that the Braysson cycle working at maximum ECOP condition has a significant advantage in entropy-generation rate and thermal efficiency than that working at maximum ecological function condition.