Simulation of Optical Performance for a Solar Cavity Receiver Arranged With Spiral Tubes

doi:10.12096/j.2096-4528.pgt.22120

Abstract

Abstract:

Using TracePro optical software, the differences in optical performance of solar cavity receivers with or without spiral tubes were simulated, and the effects of the reflectivity of inner wall of cavity and the outer diameter and pitch of the spiral tubes on the optical performance of receivers were investigated. Besides, the optical performance of four different receiver shapes were also compared. The results show that it is not proper to approximate the inner wall of the receivers as the outer surface of the spiral tubes, because this approximation cannot truly reflect the heat flux absorbed by the spiral tubes. When the pitch is constant, the reflectivity of the inner wall of the cavity is proportional to the amount of heat flux absorbed by the outer surface of the spiral tubes and the optical efficiency of the system. As the reflectivity is less than 0.8, the increase of the pitch can improve the optical performance of the receiver, while the opposite is true when the reflectivity exceeds 0.8. In addition, the truncated-cylindrical receiver has the best optical performance among the four different shapes of receivers, and its optical efficiency can reach as high as 85.42%. This research can provide theoretical guidance for the design and optimization of receivers, and lay a foundation for the analysis of heat transfer performance of receivers.

Key words: solar energy, cavity receiver, spiral tubes, reflectivity, optical performance

CLC Number:

TK 513.3

Xiaowen WANG, Nan TU, Jiabin FANG, Xiaoqun LIU, Chiyu WANG, Jiachen LIU. Simulation of Optical Performance for a Solar Cavity Receiver Arranged With Spiral Tubes[J]. Power Generation Technology, 2023, 44(2): 221-228.

Figures/Tables 13

Fig. 1 Optical model of dish solar concentrating heat collecting system

Table.1 Simulation conditions

固定量	变量	数量/组
圆柱形腔体	有无螺旋管	2
2 mm螺距	螺旋管外径8~18 mm	21
12 mm螺旋管外径	螺距0~4 mm	33
1、2、3 mm螺距	腔体内壁面反射率0~1	33
0.9、0.1的腔体内壁面反射率	腔体底部无反射锥、圆锥形反射锥和球形反射锥	6
开口大小和螺旋管圈数	4种形状的腔式吸热器	4

Fig. 2 Heat flux distribution in the focal plane

Tab.2 Absorbed energy and optical efficiency of the cavity for different tube diameters

方法	DNI/ (W⋅m^-2)	d=8 mm		d=12 mm		d=18 mm
方法	DNI/ (W⋅m^-2)	Q_ab/W	η_opt/%	Q_ab/W	η_opt/%	Q_ab/W	η_opt/%
文献[19]	650	2 232.12	82.081	2 229.60	81.988	2 221.71	81.698
文献[19]	1 000	3 434.02	82.081	3 430.15	81.988	3 418.17	81.698
本文	650	2 219.41	81.596	2 216.63	81.494	2 198.53	80.828
本文	1 000	3 413.98	81.596	3 409.70	81.494	3 381.86	80.828

Tab.3 Comparison of optical performance of cavity receivers with and without spiral tubes

是否有螺旋管	腔内侧面光通量/W	底面光通量/W	系统光学效率/%
无螺旋管	3 195.3	548.93	76.86
有螺旋管	3 302.1	295.72	79.43

Fig. 3 Effect of outer diameters of spiral tubes on optical performances of cavity receiver

Fig. 4 Effect of pitches on optical performance of cavity receiver

Fig. 5 Effect of inner wall reflectivity on optical performance of cavity receiver under different pitches

Fig. 6 Distribution of solar radiation heat flux on built-in spiral tubes under different reflectivities

Fig. 7 Effect of different measures on optical performance of cavity receiver

Fig. 8 Distribution of solar radiation heat flux on the outer surface of the spiral tubes under three measures

Fig. 9 Cavity receivers with different shapes

Fig. 10 Optical performance of cavity receivers with different shapes

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