摘要
选取24种有机工质对利用低品位余热的有机朗肯循环系统性能进行理论分析,研究发现:当膨胀机入口工质为饱和状态时,最大净功出现在T1/TC≈0.98～0.99处,且临界温度高的工质作功能力明显优于临界温度低的工质。对于超临界ORC循环,只要P1不太低,提高T1有利于增大净功、热效率及效率。超临界ORC的作功能力并非总是优于饱和或过热ORC。所有工质状态从亚临界饱和转变为超临界状态时,净功、热效率、效率及质量流量的变化都是不连续的。
The performance analysis of a transcritical organic Rankine cycle system driven by exhaust heat is presented by using 24 organic working fluids.Four parameters,such as the net power output,thermal efficiency,exergy efficiency,and mass flow rate of working fluid,are used to evaluate the performance of this recovery cycle.The results reveal that the maximum net power can be obtained for the saturated ORC,when T1/TC is about 0.98～0.99,and the working fluid with higher critical temperature has more net power output.For the supercritical ORC,the higher expander inlet temperature will benefit the net power output,thermal efficiency,and exergy efficiency,as long as the expander inlet pressure isnnot too low.However,the influences of expander inlet pressure on these performance parameters are linked with the expander inlet temperature and working fluids.The capability of doing power output of supercritical ORC is not always better than that of subcritical ORC.Parameters,such as net power,thermal efficiency,and exergy efficiency,and mass flow rate are discontinuous in the process from subcritical conditions to supercritical conditions.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第12期57-61,67,共6页
Journal of Chongqing University
基金
国家重点基础研究发展计划资助项目(2011CB710701)
关键词
废热
有机朗肯循环
热效率
净功
质量流量
waste heat
organic Rankine cycle
thermal cycle
net power
mass flow rate
