摘要
为提高有机朗肯循环(ORC)的净输出功率和热效率,提出了双流体有机朗肯循环系统;选择高温循环工质R245fa分别与3种低温循环工质R134a,R152a和R236fa进行组合;采用REFPROP及MATLAB软件进行计算,比较3种组合方式下系统的热力性能。结果表明:高、低温循环工质分别为R245fa和R152a时,系统热力性能优于其他2种组合方案,其所对应系统的最大净输出功率、热效率、火用效率分别为35kW,7.67%和62.53%,高温蒸发温度为417K;系统净输出功率的变化幅度大于热效率和火用效率;系统净输出功率随低温蒸发温度的升高而增大;过热度对系统热力性能的影响较小,说明无需增加过热度来优化系统。
In order to improve the net output power and efficiency of organic Rankine cycles,the dual fluid organic Rankine cycle system was proposed.An organic fluid R245 fa for high temperature cycle and three low temperature cycle fluids,R134 a,R152aand R236 fa,were selected to combine together.The REFPROP and MATLAB software were employed to calculate and compare thermodynamic performance of the system in the above three combinations.The results show that,the thermodynamic performance of the system using R245 fa as the high temperature cycle fluid and R152 aas the low temperature cycle fluid is better than the other two combinations,the maximum net output power,thermal efficiency and exergy efficiency of this system reaches 35 kW,7.67% and 62.53%,and the high temperature evaporation temperature is 417 K.The variation of the system net output power is larger than that of the heat efficiency and exergy efficiency.The net output power increases with the evaporation temperature in low temperature system.The overheat degree affects the system thermodynamic performance little,indicating there＇s no need to increase the overheat degree to optimize the system.
出处
《热力发电》
CAS
北大核心
2016年第6期46-50,共5页
Thermal Power Generation
基金
国家自然科学基金项目(61262048)
关键词
双流体
有机朗肯循环
高温循环
低温循环
工质
净输出功率
热效率
火用效率
dual fluid
organic Rankine cycle
high temperature cycle
low temperature cycle
working fluid
net output power
thermal efficiency
exergy efficiency
作者简介
廖雷（1991-），男，硕士研究生，主要研究方向为发电厂热力设备及系统性能。E-mail：liao_lei66@163．com
