不同有机工质对太阳能低温热发电效率的影响  

EFFECT OF WORKING FLUIDS ON THE EFFICIENCY OF LOW-TEMPERATURE SOLAR THERMAL-ELECTRIC POWER GENERATION SYSTEM

作　　者：裴刚[1] 李晶[1] 季杰[1] 

机构地区：[1]中国科学技术大学热科学和能源工程系,合肥230027

出　　处：《太阳能学报》2010年第5期581-587,共7页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(50708105);安徽省自然科学基金(070414161)

摘　　要：建立了带有工质液态区与两相区二级蒸发器的太阳能低温热发电系统模型。研究工质液态区集热器效率随蒸发器中换热流体和工质两者质量流量比变化的函数关系,并在最佳质量流量比条件下比较不同工质对集热器整体效率的影响。研究发现,相同蒸发温度条件下两相区吸热量与液态区吸热量比值越小的工质,对应的集热器整体效率越高。把不同工质对ORC效率的影响进行对比,指出具有最高的ORC效率的工质并不能同时获得最高的集热效率。对该文研究的热发电系统,在750W/m^2的辐照条件下,R113相比于其它工质发电效率最高,系统最大发电效率达到8.0%。The low-temperature solar-thermal-electric power generation system with two-stage evaporators of liquid-area evaporator and saturated-area evaporator was modularized. The relation between the liquid-heat exchanger thermal effi- ciency and the mass ratio of heat transfer fluid to organic fluid was studied. With the optimum mass ratio the influence of each organic fluid on the total thermal efficiency of collectors was shown. The result indicated that when the evaporation temperature for all the organic fluids is kept constant, the fluid with smaller ratio of the latent heat to the heat needed for liquid-temperature increasing can lead to higher thermal efficiency of the collectors. The influence of organic fluids on the efficiency of collectors is not consistent with that on thermal efficiency of ORC and the fluid that achieves the highest ORC efficiency isn＇ t able to gain the highest efficiency of collectors. Among the researched organic fluids, R113 is the most effective one and the maximum efficiency is 8.0% with an insolation of 750W/m^2.

关 键 词：有机工质 太阳能 热发电 发电效率 

分 类 号：TK5[动力工程及工程热物理—热能工程]