A simple method to achieve a uniform flux distribution in a multi-faceted point focus concentrator

Pérez-Enciso, Ricardo Arturo; Gallo, A.; Riveros-Rosas, David; Fuentealba-Vidal, Edward; Pérez-Rábago, Carlos

doi:10.1016/j.renene.2016.02.069

Cited by 29 publications

(5 citation statements)

References 31 publications

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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%

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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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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“…Generally, a conventional method of obtaining a more uniform irradiance distribution is by defocusing the rays by moving the receiver aperture out of the focal plane [26,34]. This causes a spread of the solar image on the receiver aperture.…”

Section: Optimization Of Relative Position Of Receiver Aperture To Focal Plane Of the Parabolic Dishmentioning

confidence: 99%

Design and Three-Dimensional Simulation of a Solar Dish-Stirling Engine

Ghafour¹,

Mikhael²,

Ghandour³

2021

ARFMTS

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Design and three-dimensional simulation of a solar Dish-Stirling (SDS) engine is currently performed. The design starts with the GPU-3 Stirling engine, which is originally built to generate power from the fossil fuel exclusively. The design is conducted through three subsequent phases. Firstly, several parabolic dishes with different rim angles and number of facets are investigated to optimally design the dish concentrator. Secondly, different relative positions of the receiver aperture to the dish focal plane are tested to reach the optimal position. The optical simulation of the solar concentration process is carried out using SolTRACE software. Finally, an optimal design for a cavity receiver that involves a new structure of the heater tubes is performed. The simulation of the engine with the designed receiver is implemented using the commercial CFD code ANSYS FLUENT. Having finished the design, a comprehensive energy analysis of the designed SDS engine is carried out. The results show that a nearly uniform temperature distribution of the heater tubes throughout the cycle is achieved. The overall thermal efficiency of the designed SDS engine is about 31.8 % at a DNI of 1000 W/m2.

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“…Hatwaambo et al [63] used semi-diffuse rolled reflective elements in low concentrating photovoltaic system to improve the system performance. Perez-Enciso et al [64] proposed a method to achieve a uniform flux distribution with a multi-faceted point focus concentrator, which can be used in different types of receiver and no additional device is required to homogenize the flux. Yeh [65] illustrated the solar radiation distribution of a two-stage solar concentrator combining the Fresnel lens (FL) and the compound flat concentrator (CFC), and demonstrated the way that a 2nd stage reflector of right dimension has the function of enhancing flux intensity and uniformity at the same time.…”

Section: Concentrator Choicementioning

confidence: 99%

Effect of non-uniform illumination and temperature distribution on concentrating solar cell - A review

Xuan

Pei

et al. 2018

Energy

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Concentrated photovoltaic (CPV) technology as a typical PV application is becoming popular due to its advantages of high conversion efficiency and low cost etc.However an important issue for CPV technology is the non-uniformity on the illumination and the temperature which can finally influence the overall electrical efficiency of solar cells. This study presents the feature of the non-uniform illumination and temperature, and reviews the cause and harm of the non-uniform illumination and temperature. Then the specific effect on cell parameters of different solar cells is analyzed, and finally the improving methods for reducing this negative effect on concentrating solar cells are proposed. This review will help researchers to learn the effect of the non-uniformity on the illumination and the temperature, and common improvement method, which will benefit CPV design and optimization. *Revised Manuscript with No Changes Marked Click here to view linked References

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A simple method to achieve a uniform flux distribution in a multi-faceted point focus concentrator

Cited by 29 publications

References 31 publications

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

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

Design and Three-Dimensional Simulation of a Solar Dish-Stirling Engine

Effect of non-uniform illumination and temperature distribution on concentrating solar cell - A review

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