Influence of incident angle on performance of non-tracking compound parabolic concentrator
In order to reduce the requirement of tracking accuracy of compound parabolic concentrator and improve its photo-thermal conversion ability during solar heat collection,it is aimed to explore the influence mechanism of the incident angle on the photothermal performance of the novel compound parabolic concentrator under non-tracking conditions.Firstly,the ener-gy conversion relationship of the concentrator in the heat collection process was analyzed theoretically,and the influence of incident angle on the optical performance of the concentrator was probed with the optical software TracePro.Based on this work,a testing bench for the performance of non-tracking compound parabolic concentrator was built,and the photothermal performance of the concentrator with respect to the radial incidence angle was tested and analyzed under actual weather condi-tions.The results indicate that the optical performance of the concentrator is the best when the incident angle is 0°,the over-all ray̍s receiving rate and concentrating efficiency are 100%and 83.42%,respectively.When the radial incident angle is 16°,the overall ray̍s receiving rate and concentrating efficiency of the concentrator are 53.00%and 44.82%,respective-ly,and these two parameters are 88.74%and 74.42%when the axial incident angle is 30 °,respectively.When the air velocity is 3.7 m/s,the maximum outlet temperature and instantaneous solar heat collection of the concentrator receiving nor-mal solar radiation are 31.3℃and 782.8 W,respectively,which are 3.7℃and 6.1℃respectively,and 131.0 W and 217.9 W respectively higher than those of the concentrator receiving solar radiation with radial incident angle of +10° and-10°.In addition,the average photothermal conversion efficiency of the concentrator receiving normal incident radiation is 77.45%,which is 42.14%and 52.97%higher than that receiving +10° and-10°incident radiation.
solar energyincident anglecompound parabolicnon-trackingconcentration
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NSTL
万方数据
维普
