内可逆闭式布雷顿联产装置(炯)输出率与(炯)效率

应用有限时间热力学方法,分析了恒温热源条件下内可逆闭式布雷顿联产装置的火用输出率,导出了无因次总输出率及效率公式.利用数值计算的方法,分析了输出率与热导分配比、循环压比参数之间的关系,研究表明:存在最佳的热导分配比和最优的压比参数,使得装置的输出率最大.进一步探讨了循环温比、用户温比、电热比对最大输出率和最佳热导分配比的影响,发现,高温侧最佳热导分配比始终保持在0.5左右.

Exergy output rate and exergy efficiency for endoreversible closed Brayton cogeneration plant

Finite time thermodynamics was applied to analyze the exergy performance of an endoreversible closed Brayton cogeneration plant coupled to constant temperature reservoirs.The formulae of dimensionless total exergy output rate and exergy efficiency were derived.The relations between dimensionless total exergy output rate and heat conductance allocation ratios,pressure ratio parameter were numerically analyzed.It shows that there exists an optimum heat conductance allocations and optimal pressure ratio parameter which maximizes the dimensionless total exergy output rate.The effects of cycle temperature ratio,user temperature ratio,and power to heat ratio on maximum dimensionless total exergy output rate and on optimum heat conductance allocation ratios are also investigated.It is found that the optimum heat conductance allocation ratio on hot side is almost constant at 0.5.