不可逆变温热源KCS-34循环生态学性能优化

Ecological Performance Optimization of an Irreversible Variable Temperature Heat Reservoir KCS-34Cycle

应用有限时间热力学理论,基于变温热源不可逆KCS-34循环模型,分析了循环工质氨浓度变化时,循环工质质量流率和蒸发器出口循环工质干度对生态学函数的影响,并对循环净功率、效率与生态学函数三者之间的关系进行了对比分析。研究发现,当以循环工质质量流率为变量时,生态学函数与效率、循环净功率与效率均呈类抛物线关系,而生态学函数与循环净功率之间关系曲线为扭叶型;当以蒸发器出口循环工质干度为变量时,循环净功率、效率和生态学函数任意两者之间的曲线关系均为扭叶型。

The effects of the outlet quality of cycle working fluid of the evaporator and the mass flow rate of cy- cle working fluid with different ammonia concentration of cycle working fluid on ecological function, and the relations among net power output, thermal efficiency and ecological function are analyzed by applying finite time thermodynamic theory based on an irreversible KCS-34 cycle model coupled to variable temperature heat reservoirs. It is found that when the mass flow rate of cycle working fluid is variable, the relationship between the ecological function and net power output, and the relationship between net power output and thermal effi- ciency are both in kind of parabolic relationship; while the relationship between ecological function and net power output is a twisted blade. It is also found that when the outlet quality of cycle working fluid of the evaporator is varia- ble, any relationship among net power output, thermal efficiency and ecological function is twisted.