有机朗肯循环系统蒸发器传热特性分析  

Analysis of heat transfer characteristics of evaporator in organic Rankine cycle system

作　　者：李新禹[1] 陈林[1] 谷操[2] 刘涛 LI Xin-yu;CHEN Lin;GU Cao;LIU Tao(School of Mechanical Engineering,Tianjin Polytechnic University,Tianjin 300387,China;China North Vehicle Research Institute,Beijing 100072,China)

机构地区：[1]天津工业大学机械工程学院,天津300387 [2]中国北方车辆研究所,北京100072

出　　处：《化学工程》2019年第6期42-47,共6页Chemical Engineering(China)

基　　金：天津市自然科学基金资助项目(C16JCZDJC31400)

摘　　要：为了提高有机朗肯循环(ORC)系统中蒸发器换热效率,采用CFD软件FLUENT数值模拟计算方法与试验相结合,选取6种临界温度不同的待选工质,研究了工质进口速度、热空气进口速度、热空气进口温度、工质临界温度对蒸发器[火用]效率、[火用]损失率的影响,得出蒸发器换热效率最高的工质进口速度、热空气进口速度、热空气进口温度,进而得出各种待选工质的换热效果。研究表明:当工质进口速度为系统最小速度、热空气进口速度为系统最大速度时,蒸发器换热效率最高;待选工质临界温度越高,蒸发器换热效率越好;所有待选工质中换热效果:R245fa>正丁烷>异丁烷>R134a>R143a>R125。In order to improve the heat transfer efficiency of evaporator in ORC system,CFD software FLUENT numerical simulation method was used.Selecting six kinds of different critical temperatures for working fluids,the effects of inlet velocity of working fluid,inlet velocity of hot air,inlet temperature of hot air and critical temperature of working fluid on the exergy efficiency and exergy loss rate of evaporator were studied.The inlet velocity of working fluid,inlet velocity of hot air and inlet temperature of hot air with the highest heat transfer efficiency of evaporator were obtained.Furthermore,the heat transfer effects of various selected working fluids were obtained.The research shows that when the inlet speed of working fluid is the minimum and the inlet speed of hot air is the maximum,the heat transfer efficiency of evaporator is the highest and the heat transfer efficiency of evaporator increases with the critical temperature of selected working fluid.The heat transfer effect of all selected working fluids:R245fa>n-butane>isobutane>R134a>R143a>R125.

关 键 词：蒸发器 换热效率 CFD 效率 损失率 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]