碟式太阳能集热器热流密度分布特性
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摘要
为了研究散射误差对碟式太阳能聚光性能的影响,采用蒙特卡罗光线跟踪法对碟面聚光反射进行了计算;分析反射光聚集到集热器端面的热流密度分布情况;对比了散射误差为1.75、2.50、5.00、10.00 mrad时的热流密度分布差异。结果表明:热流密度在集热器端面分布均匀,中心点密度高且热流密度接近圆形分布;随着碟式抛物面聚光镜散射误差的增大,集热器端面热流密度的分布趋于分散;热流密度与聚光特性成正比,热流密度越小,碟式太阳能聚光器聚光性能越差。
In order to study the effect of scattering error on concentrating performance of dish solar energy collector,the Monte Carlo ray-tracing method was used to calculate the concentrating reflection.The distribution of heat flux of the reflected light to the collector end face is studied,and the heat flow density distribution differences when the scattering error is 1.75 mrad,2.50 mrad,5.00 mrad and 10.00 mrad were compared.The result indicates that,at the collector end,the heat flux density is close to the circular distribution.With the increasing scattering error,the distribution of the heat flux distribution tends to disperse.The lower the heat flux,the worse the condenser performance.
In order to study the effect of scattering error on concentrating performance of dish solar energy collector,the Monte Carlo ray-tracing method was used to calculate the concentrating reflection.The distribution of heat flux of the reflected light to the collector end face is studied,and the heat flow density distribution differences when the scattering error is 1.75 mrad,2.50 mrad,5.00 mrad and 10.00 mrad were compared.The result indicates that,at the collector end,the heat flux density is close to the circular distribution.With the increasing scattering error,the distribution of the heat flux distribution tends to disperse.The lower the heat flux,the worse the condenser performance.
引文
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[3]余长富,阮应君,吴家正.太阳能光伏光热一体化系统性能影响因素[J].热力发电,2015,44(11):20-25.YU Changfu,RUAN Yingjun,WU Jiazheng.Experimental study on performance of hybrid PV/T solar system and its influencing factors[J].Thermal Power Generation,2015,44(11):20-25.
[4]吴晋兰,由世俊,张欢,等.抛物面槽式太阳集热器的性能研究[J].太阳能学报,2016,37(3):794-797.WU Jinlan,YOU Shijun,ZHANG Huan,et al.Performance study of solar heat-transfer mediumparabolic through collector[J].Acta Energiae Solaris Sinica,2016,37(3):794-797.
[5]何雅玲,王坤,杜保存,等.聚光型太阳能热发电系统非均匀辐射能流特性及解决方法的研究进展[J].科学通报,2016,61(30):3208-3237HE Yaling,WANG Kun,DU Baocun,et al.Non-uniform characteristics of solar flux distribution in the concentrating solar power systems and its corresponding solutions[J].Chinese Science Bulletin,2016,61(30):3208-3237.
[6]吴晓楠,张燕平,黄树红.太阳能有机朗肯循环发电系统工质及参数优化[J].热力发电,2015,44(6):31-35.WU Xiaonan,ZHANG Yanping,HUANG Shuhong.Working fluids and optimization of operation conditions for medium-low temperature solar based organic rankine cycle[J].Thermal Power Generation,2015,44(6):31-35.
[7]徐再远,魏毅力,梦玲,等.5 k W碟式太阳能集热器设计及焦斑分析[J].热力发电,2016,45(6):94-99.XU Zaiyuan,WEI Yili,MENG Ling,et al.Design and focal spot analysis for a 5 k W disc type solar collector[J].Thermal Power Generation,2016,45(6):94-99.
[8]马炎,陆海军,钱裕,等.双轴跟踪槽式太阳能集热器性能试验[J].热力发电,2015,44(1):19-24MA Yan,CHEN Haijun,QIAN Yu,et al.Performance test of a two-axis tracking parabolic trough solar collector[J].Thermal Power Generation,2015,44(1):19-24.
[9]SHUAI Y,XIA X L,TAN H P.Radiation performance of dish solar concentrator/cavity receiver systems[J].Solar Energy,2008,82(1):13-21.
[10]SHUAI Y,ZHANG X F,TAN H P.Simulation for concentrating characteristic of parabolic solar collector system[J].Journal of Engineering Thermophysics,2006,27(3):484-486.
[11]黄湘,王志峰,李艳红,等.太阳能热发电技术[M].北京:中国电力出版社,2012:7-49.HUANG Xiang,WANG Zhifeng,LI Yanhong,et al.Solar thermal power generation technology[M].Beijing:China Electric Power Press,2012:7-49.
[12]李俊贤,王辉涛,王华,等.蛇形管平板式太阳能集热器的试验研究[J].科学技术与工程,2011,11(7):1441-1446.LI Junxian,WANG Huitao,WANG Hua,et al.Experimental analysis of serpentine-flow flat-plate solar collector[J].Science Technology and Engineering,2011,11(7):1441-1446.
[13]DALY J C.Solar concentrator flux distributions using backward ray tracing[J].Applied Optics,1979,18(15):2696-2699.
[14]帅永,夏新林,谈和平.碟式抛物面太阳能聚能器焦面特性数值仿真[J].太阳能学报,2007,28(3):263-267.SHUAI Yong,XIA Xinlin,TAN Heping.Numerical simulation for focal region characterization in paraboloidal dish solar concentrators[J].Acta Energiae Solaris Sinica,2016,37(3):794-797.
[15]SHUAI Y,XIA X L,TAN H P.Radiation performance of dish solar concentrator/cavity receiver systems[J].Solar Energy,2008,82(1):13-21.