混合工质(R227ea/R245fa)有机朗肯循环的动态特性研究  

Dynamic Study of Organic Rankine Cycle Using Mixtures(R227ea/R245fa) as Working Fluid

作　　者：陈晓雪 刘朝[1,2] 李期斌 徐肖肖[1] CHEN Xiao-Xue;LIU Chao;LI Qi-Bin;XU Xiao-Xiao(Key Laborcitory of low-grcicle Energy Ut ilization Technologies and Systems,Ministry of Education,School of Energy and Power Engineering,Chongqing University,Chongqing 400030,China;Stntc Key Laboratory of Power Transmission Equipment and System Security and New Technology,Chongqing 400030,China)

机构地区：[1]重庆大学能源与动力工程学院,低品位能源利用技术及系统教育部重点实验室,重庆400030 [2]输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《工程热物理学报》2020年第7期1604-1611,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51576019)。

摘　　要：本文以R227ea/R245fa混合物为工质,建立了有机朗肯循环的动态模型,对不同组分混合工质的动态特性表现及稳态性能进行了分析比较。研究发现,系统响应速度与工质的质量流量、换热强度及工质物性都有着密切的联系。工质流量较大及潜热较小的工质系统热惯性更大,其响应时间更长。当混合工质R227ea/R245fa质量配比为0.5/0.5时,系统的净功最大,而最大热效率出现在R227ea/R245fa的质量比为0.4/0.6的工质系统。对于R245fa质量分数较大的工质系统,需要更加注意对蒸发器出口过热度的控制。Dynamic models of Organic Rankine Cycle(ORC)with R227 ea,R245 fa and their mixtures are established.The dynamic and static performance of mixtures with different components are analyzed and compared.It is found that the response speed of the system is closely related to the mass flow rate of working fluid,heat exchange strength and the physical properties of fluid.The system using working fluid with larger flow rate and smaller latent heat has greater thermal inertia and longer response time.When the mass fraction of mixed working fluid R227 ea/R245 fa is 0.5/0.5,the network of system is the largest,and the maximum thermal efficiency occurs at the mass ratio of0.4/0.6.For the system with larger mass fraction of R245 fa,the control of the overheating of working fluid at the evaporator outlet should be paid to more attention.

关 键 词：混合工质 有机朗肯循环 动态特性 

分 类 号：TK115[动力工程及工程热物理—热能工程]