基于菲涅尔二次反射塔式太阳能聚光系统的新型吸收器集热性能实验研究  

EXPERIMENTAL INVESTIGATION ON PERFORMANCE OF RECEIVER IN BEAM-DOWN CONCENTRATING SOLAR TOWER WITH LINEAR FRESNEL HELIOSTATS

作　　者：马玄 章代红 代彦军[1] 李显[1] 黄官正 王如竹[1] Ma Xuan;Zhang Daihong;Dai Yanjun;Li Xian;Huang Guanzheng;Wang Ruzhu(Institute of Refrigeration and Cryogenics,Key Laboratory for Power Machinery and Engineering of M.O.E,Shanghai Jiao Tong University,Shanghai 200240,China;Anhui State Grid Energy Equipment Engineering Company,Anqing 246700,China)

机构地区：[1]上海交通大学机械与动力工程学院太阳能发电与制冷教育部工程研究中心,上海200240 [2]安徽国电能源设备工程有限公司,安庆246700

出　　处：《太阳能学报》2019年第7期1823-1831,共9页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51276112)

摘　　要：介绍一种与菲涅尔二次反射塔式太阳能聚光系统匹配的新型吸收器,在吸收器上方固定CPC,以增加其集热效率。首先理论上分析聚光系统的光学效率以及吸收器的集热效率和效率;然后通过实验测定导热油在吸收器不同进口温度和流量下的集热性能。利用最小二乘法拟合得到集热效率和归一化温度T*的线性关系,获得整个聚光集热系统的光学效率η0。最后通过效率确定吸收器在不同流量下的最佳运行温度Topt在流量580 L/h时约为145℃,在流量400 L/h时约为142℃。In this paper,a novel type of receiver cooperated with beam-down concentrating solar tower system with linear Fresnel heliostats is introduced,above which CPC is mounted so that its solar-thermal efficiency is expected to be higher.First,optical efficiency of the system and solar-thermal efficiency of receiver are theoretically analyzed,including receiver’s exergy efficiency and are then measured through corresponding experiments at different inlet temperature and flow rates inside the absorber.By straight regression fitting,the linear relationship between the solarthermal efficiency and the ratio of temperature difference to the DNI is obtained,whereαηo is the value of the point of intersection with y-axis of the straight regression line.Finally,exergy efficiencies under different test conditions are calculated,thus attaining the receiver’s optimal operation temperature at different flow rates:Topt is about 145℃at 580 L/h;Topt is about 142℃at 400 L/h.

关 键 词：太阳能 定日镜 光束追踪 吸收器和CPC 集热效率 最佳运行温度 

分 类 号：TK51[动力工程及工程热物理—热能工程]