槽式集热器集热效率影响因素的分析研究
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摘要
实际应用中槽式太阳能集热器一般采用一维跟踪太阳的方式,一维跟踪的槽式太阳能集热系统由于照射在抛物镜面末端的太阳光线会聚不到集热管上导致末端损失,全年末端损失变化差异较为明显,对集热器集热效率产生一定影响,利用MATLAB软件对不同集热器参数φ、N、ψ、Wa、L、f下吸热管末端损失对集热器集热效率的影响进行计算分析。研究结果表明:存在末端损失的情况下全年集热器集热效率最大值出现在夏至日前后,最小值出现在冬季;一天中ψ=0°时集热器集热效率最小值为85%出现在正午12点,随着方位角增大集热效率最小值逐渐减小同时出现时刻向正午之后推迟;增加集热管长度可以补偿末端损失提升集热效率,但是在集热管长度较短的情况下效果较为明显。
There is an inevitable end loss with a certain impact on heat collection efficiency when parabolic trough collector withone-dimensional tracking in practical application. The impact of the end loss on heat collection efficiency is calculated and analyzed by MATLA Bunder different collector parameters,including φ,N,ψ,Wa,L,f. The results indicate that in the case of the end loss,the maximum value of heat collection efficiency of the whole year appears before and after the summer and the minimum value appears in winter. All day,the minimum value of the heat collection efficiency is 85%appeared at 12 noon when ψ = 0°,the time gradually delayed with the increases of ψ; Increasing the length of the collector tube can compensate for the increase of the collector loss due to the end loss,but the impact is obvious when the collector tube length is short.
There is an inevitable end loss with a certain impact on heat collection efficiency when parabolic trough collector withone-dimensional tracking in practical application. The impact of the end loss on heat collection efficiency is calculated and analyzed by MATLA Bunder different collector parameters,including φ,N,ψ,Wa,L,f. The results indicate that in the case of the end loss,the maximum value of heat collection efficiency of the whole year appears before and after the summer and the minimum value appears in winter. All day,the minimum value of the heat collection efficiency is 85%appeared at 12 noon when ψ = 0°,the time gradually delayed with the increases of ψ; Increasing the length of the collector tube can compensate for the increase of the collector loss due to the end loss,but the impact is obvious when the collector tube length is short.
引文
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[4]杨宾.槽式太阳能直接蒸汽热发电系统性能分析与实验研究[D].天津:天津大学,2011.
[5]许成木.槽式聚光太阳能系统光热能量转换利用理论与实验研究[D].昆明:云南师范大学,2014.
[6]肖杰,何雅玲,程泽东,等.槽式太阳能集热器集热性能分析[J].工程热物理学报,2009,30(5):729-733.
[7]Yanqing Zhu,Jifu Shi,Yujian Li,et al.Design and experimental investigation of a stretched parabolic linear fresnel reflector collecting system[J].Energy Conversion and M anagement,2016,126:89-98.
[8]崔映红,卑振华,赵熙.抛物面槽式太阳能集热器场热损失分析[J].可再生能源,2010,28(5):5-9.
[9]Chengmu Xu,Zhiping Chen,Ming Li,et al.Research on the compensation of the end loss effect for parabolic trough solar collectors[J].Applied Energy,2014,115:128-139.
[10]Ming Li,Chengmu Xu,Xu Ji,et al.A new study on the end loss effect for parabolic trough solar collectors[J].Energy,2015,82:382-394.