摘要
计入工质与高、低温侧换热器和回热器的热阻损失 ,压气机和涡轮机中的不可逆压缩和膨胀损失及管路系统中的压力损失 ,用有限时间热力学方法 ,导出了变温热源条件下实际回热式布雷顿循环功率密度与压比间的解析式 ;借助于数值计算 ,研究了高、低温侧换热器和回热器的热导率分配和工质与热源间的热容率匹配对最大功率密度的影响 .
The analytical formulas for the relations between power density and pressure ratio of a real regenerated Brayton cycle coupled to variable-temperature heat reservoirs are derived by using finite-time thermodynamics. In the analysis, the irreversibilities involve the heat resistance losses in the hot-and cold-side heat exchangers and regenerator, the irreversible compression and expansion losses in the compressor and turbine, and the pressure losses in the piping. The effects of the thermal conductance distribution of hot-and cold-side heat exchangers and of the thermal capacity rate matching between the working fluid and the heat reservoirs on the power density are studied by detail numerical examples.
出处
《应用科学学报》
CAS
CSCD
2001年第3期268-272,共5页
Journal of Applied Sciences
基金
国家重点基础研究发展规划 973资助项目 ( G2 0 0 0 0 2 630 1)
