圆形吸收体贝壳形复合抛物聚光器模型构建及其性能  

Model construction and the performance of the shell-shaped compound parabolic concentrator with circular absorber

作　　者：陈飞[1,2] 施健鹏 Chen Fei;Shi Jianpeng(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Institute of Solar Energy Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学化学工程学院,昆明650500 [2]昆明理工大学太阳能工程研究所,昆明650500

出　　处：《农业工程学报》2022年第3期173-181,共9页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金(51866005);云南省“万人计划”青年拔尖人才专项(YNWR-QNBJ-2019-173)。

摘　　要：为解决沿东西方向放置的标准复合抛物聚光器(Standard-Compound Parabolic Concentrator,S-CPC)在有效工作时长内南边面形利用率低、遮挡光线、不能有效聚光的问题,该研究基于非成像光学边缘光线原理,构建了圆形吸收体贝壳形复合抛物聚光器(Shell Shaped-Compound Parabolic Concentrator,SS-CPC)的面形结构数学模型,采用可视化激光试验装置对SS-CPC模型聚光过程进行了验证。分析了旋转角对SS-CPC光学性能的影响,研究发现,旋转角β越大,SS-CPC的光学效率越低,但光口宽度、能流分布的均匀度越大。与相同接收半角的S-CPC对比试验结果表明:β值为0°、7°、34°、44°的SS-CPC平均光学效率为0.6398、0.6352、0.6201、0.6093,均高于S-CPC,且在工作时长、能流分布及均匀性方面,SS-CPC都优于S-CPC。SS-CPC有效消除了S-CPC聚光器南边面形拦截光线导致不能聚光的现象,提高了太阳辐射能的利用率。A Standard-Compound Parabolic Concentrator(S-CPC)has been used to collect and/or concentrate the solar radiation from the solar over a relatively wide range of angles.Once the S-CPC has been placed along the east-west direction in the northern hemisphere towards the north,where the solar rays irradiate from the south side,the south-facing panels cannot effectively concentrate to intercept the light directly to the surface of the absorber throughout the year.Particularly,the southern side of the non-concentrating surface absorbs the solar radiation energy after the temperature rises,resulting in the increasing thermal stress for the material aging,where the face shape structure can be more easily damaged.In this study,a novel mathematical model was constructed for the face structure of a Shell-Shape Compound Parabolic Concentrator(SS-CPC)with a circular absorber,according to the non-imaging optical fringe light.The partial light interception by the southern face of the S-CPC was effectively eliminated to run smoothly during the daylight hours from the autumn equinox to the following spring equinox.Meanwhile,a physical prototype of SS-CPC was also fabricated using 3D printing.A visible laser experimental device was then selected to verify the concentrating characteristics.It was found that the light paths from the numerical simulation and experimental measurement were better consistent within a certain difference range,indicating the high accuracy of the theoretically constructed SS-CPC surface structure.Four SS-CPCs were prepared with different rotation anglesβ(0°,7°,34°,and 44°)in the Kunming City,Yunnan Province,southern China at 25°N.The optical performance was determined to compare with the S-CPC with the same acceptable half-angle.The results were as follows.1)The rotation angleβwas negatively correlated with the overall optical efficiency of the SS-CPC.There was a slow decrease and then a gradual increase in the optical efficiency of the SS-CPC within the full incidence angle,with the increase of the

关 键 词：太阳能 模型 复合抛物聚光器 贝壳形 光学效率 均匀度 

分 类 号：O435.1[机械工程—光学工程]