Improved irradiance distribution on high concentration solar cell using free-form concentrator

Tsai, Chung-Yu

doi:10.1016/j.solener.2015.03.032

Cited by 23 publications

(10 citation statements)

References 22 publications

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“…The concentration could be realized by using optical elements such as reflectors and Fresnel lens, the incident light could be concentrated to the cell by reflection and transmission [31], as shown in Figs. 1 and 2, which were drew by Tsai and Zhuang et al [32,33]. The downconverter materials also could be used to concentrate the incident light to the cell, the incident light was absorbed by the downconverter materials first, and then the light with longer wavelength whose photon energy was close to the bandgap of silicon was emitted by the downconverter materials to the cell.…”

Section: Concentration Systems Using Silicon Solar Cellsmentioning

confidence: 99%

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A review of concentrator silicon solar cells

Xing

Han

Wang

et al. 2015

Renewable and Sustainable Energy Reviews

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Section: Concentration Systems Using Silicon Solar Cellsmentioning

confidence: 99%

“…The schematic of reflector concentrator drawn by Tsai et al[32]. Reprinted from Solar Energy, 115, Tsai CY, Improved irradiance distribution on high concentration solar cell using free-form concentrator, 694-707, Copyright (2015), with permission from Elsevier.…”

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confidence: 99%

A review of concentrator silicon solar cells

Xing

Han

Wang

et al. 2015

Renewable and Sustainable Energy Reviews

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“…At present, it is mainly to improve the flux uniformity of the receiver by designing a new solar dish concentrator with nonparabolic mirror, but it is limited to a simple plane or tubular absorber . There are 3 main types of new dish concentrators, namely, a solar concentrator consisting of multiple planar mirror units, solar concentrator consisting of multiple points focusing mirror unit, and solar concentrator with new reflector mirror surface . For example, Chong et al proposed a nonimaging planar concentrator and its design method to obtain a uniform flux distribution on the plane receiver.…”

Section: Introductionmentioning

confidence: 99%

“…Zhou et al proposed 2 versions of nonimaging dish concentrator designed for providing uniform flux profiles on the plane receiver. A free surface method is also used to design a new reflector surface to improve the flux uniformity …”

Section: Introductionmentioning

confidence: 99%

Mirror rearrangement optimization for uniform flux distribution on the cavity receiver of solar parabolic dish concentrator system

2018

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Summary The nonuniform and high‐gradient solar radiation flux on the absorber surface of solar dish concentrator/cavity receiver (SDCR) system will affect its operational reliability and service lifetime. Therefore, homogenization of the flux distribution is critical and important. In this paper, 2 mirror rearrangement strategies and its optimization method by combining a novel ray tracing method and the genetic algorithm are proposed to optimize the parabolic dish concentrator (PDC) so as to realize the uniform flux distribution on the absorber surface inside the cavity receiver of SDCR system. The mirror rearrangement strategy includes a mirror rotation strategy and mirror translation strategy, which rotate and translate (along the focal axis) each mirror unit of the PDC to achieve multipoint aiming, respectively. Firstly, a correlation model between the focus spot radius and mirror rearrangement parameters is derived as constraint model to optimize the PDC. Secondly, a novel method named motion accumulation ray‐tracing method is proposed to reduce the optical simulation time. The optical model by motion accumulation ray‐tracing method and optimization model of SDCR system are established in detailed, and then, an optimization program by combining a ray‐tracing code and genetic algorithm code in C++ is developed and verified. Finally, 3 typical cavity receivers, namely, cylindrical, conical, and spherical, are taken as examples to fully verify the effectiveness of these proposed methods. The results show that the optimized PDC by mirror rearrangement strategies can not only greatly improve the flux uniformity (ie, reduce the nonuniformity factor) and reduce the peak local concentration ratio of the absorber surface but also obtain excellent optical efficiency and direct useful energy ratio. A better optimization results when the PDC is optimized by mirror rotation strategy at aperture radius of 7.0 m, focal length of 6.00 m, and ring number of 6; the nonuniform factor of the cylindrical, conical, and spherical cavity receivers is greatly reduced from 0.63, 0.67, and 0.45 to 0.18, 0.17, and 0.26, respectively; the peak local concentration ratio is reduced from 1140.00, 1399.00, and 633.30 to 709.10, 794.00, and 505.90, respectively; and the optical efficiency of SDCR system is as high as 92.01%, 92.13%, and 92.71%, respectively. These results also show that the dish concentrator with same focal length can match different cavity receivers by mirror rearrangement and it can obtain excellent flux uniformity.

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“…Canavarro et al (2016) developed a novel compound elliptical-type concentrator for a parabolic primary with a tubular receiver [30]. Tsai (2015 and 2016) adopted free-form surfaces as reflective surfaces [31,32].In the solar PV system, Ricardo Perez-Enciso et al (2016) designed a point focus solar concentrator composed of 18 spherical mirrors mounted on an equatorial solar tracker. Each mirror was 30 cm in diameter and 1.9 cm in thickness with the global reflecting area of 1.274 m 2 .…”

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confidence: 99%

Solar Concentrator Consisting of Multiple Aspheric Reflectors

Cao¹,

Qin

Rajan

et al. 2019

Energies

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This paper presents an off-axis-focused solar concentrator system consisting of 190 aspheric reflectors, where the aperture radius of each reflector is 10 cm, and vertices of all reflectors are orderly arranged in the same plane. The aspheric parameters controlling the curvature of the reflectors are determined using coordinate transformations and the particle swarm optimization (PSO) algorithm. Based on these aspheric parameters, the light distribution of focal plane was calculated by the ray tracing method. The analyses show that the designed concentrator system has a spot radius of less than 1 cm and the concentration ratio over 3300:1 is achieved using only one reflection. The design results have been verified with the optical design software Zemax.Most of the important developments of solar concentrators have been done in the solar thermal and PV systems. In the solar thermal system, the most common method is to increase focusing stages and reflectors. Rodriguez-Sanchez et al. (2015) employed secondary devices to optimize the focusing position and the incidence angle of sunlight [17]. Balaji et al. (2016) employed the combination of multi-stage focusing and multiple reflectors to increase the concentration ratio and also to improve the flux distribution over the circumference of the absorber [18]. Benyakhlef et al. (2016) used multiple rotating curved heliostats instead of flat ones to reflect the sun-rays onto the linear receiver at a fixed position. Primary focusing heliostats were arranged in rows whereas the secondary reflector was only one reflector. Interestingly, the curvature allowed the heliostats to be more precise than in flat ones and offered a higher concentration capacity [19]. Sharma et al. (2015) utilized the line Fresnel reflector (LFR) field consisting of parallel rows of collectors in which each collector-row was composed of parallel rows of reflectors that direct the sun-rays toward linear receivers [20]. Qin et al. (2013) raised the concentration ratio of a trough concentrator to 285:1 in case of off-axis focus by adopting reflective aspheric surfaces [14]. Recently, a prototype of two-stage non-imaging solar concentrator showed a higher concentration ratio at the receiver plane [21]. However, improving the spatial uniformity can efficiently increase the concentration ratio. A new concept of high-flux non-coaxial concentrating solar simulator was introduced to the typical ellipsoidal reflectors [22]. In some cases, multiple reflectors were used to focus the solar beam on the same small area in order to increase the temperature of the focus area [23][24][25][26]. Loni et al. (2016) used parabolic dish concentrators to focus the sun-rays on the receiver for obtaining a high temperature of work fluid. Furthermore, they designed a cylindrical closed-tube open-cavity solar receiver in such a way to absorb the solar energy to the maximum extent [27]. Other methods have also been applied to achieve high concentration ratio. Liang et al. (2015) investigated solar concentrator based on the off-ax...

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Improved irradiance distribution on high concentration solar cell using free-form concentrator

Cited by 23 publications

References 22 publications

A review of concentrator silicon solar cells

A review of concentrator silicon solar cells

Mirror rearrangement optimization for uniform flux distribution on the cavity receiver of solar parabolic dish concentrator system

Solar Concentrator Consisting of Multiple Aspheric Reflectors

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