Optimization of a discrete dish concentrator for uniform flux distribution on the cavity receiver of solar concentrator system

Yan, Jian; Peng, Youduo; Cheng, Zi-ran

doi:10.1016/j.renene.2018.06.025

Cited by 60 publications

(13 citation statements)

References 46 publications

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“…The results of the flux distribution of the focal spot in the test plane are shown in Figure 4 through the simulation calculation with the OptisWorks software. The diameter of the spot is approximately 69.8 mm, which is highly consistent with the theoretical calculation result of Equation (9). The simulation results show that the total energy of the test plane is 3436 W, and the error is 0.09% compared with the theoretical results of Equation (11), and the two results are very close to each other.…”

Section: Methodology and Model Validationsupporting

confidence: 82%

“…Chong et al [7,8] proposed a nonimaging planar concentrator and a design method to obtain a uniform flux distribution on a planar receiver. Yan et al [9] proposed a mirror rearranging method for a parabolic dish concentrator and a novel discrete dish concentrator [10], which significantly improved the flux uniformity of the cavity receiver. Evangelos et al [11] proposed cylindrical, rectangular, spherical, conical, and cylindrical-conical receivers, and the research shows that the cylindrical-conical receiver has the best flux uniformity.…”

Section: Introductionmentioning

confidence: 99%

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Improvement in the Flux Uniformity of the Solar Dish Concentrator System through a Concave Quartz Window

Nie

Peng

Yan

et al. 2020

International Journal of Photoenergy

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A nonuniform and high-strength heat flux load would reduce the working efficiency, safety, and in-service life of a cavity receiver. Four types of concave quartz windows, including conical, spherical, sinusoidal, and hyperbolic tangent, were proposed to be used in the cylindrical cavity receiver of a solar dish concentrator system, which can improve the flux uniformity and reduce the peak concentration ratio of the receiver. For each concave quartz window, 36 structural schemes were offered. Based on the Monte Carlo ray-tracing method, the results showed that the nonuniformity coefficient of the receiver was 0.68 and the peak concentration ratio was 1320.21 by using a plane quartz window. At the same time, when the receiver is in the best optical performance, it is the receiver with sinusoidal, conical, spherical, and hyperbolic tangent quartz windows, respectively. The optical efficiency of the receiver with the above four types of quartz windows was basically the same as that of the receiver with the plane quartz window, but their nonuniformity coefficients were reduced to 0.31, 0.35, 0.36, and 0.39, respectively, and the peak concentration ratio was reduced to 806.82, 841.31, 853.23, and 875.89, respectively. Obviously, the concave quartz window was better than the plane quartz window in improving the flux uniformity. Finally, a further study on the sinusoidal quartz window scheme of all of the above optimal parameter schemes showed that when the installation position of the receiver relative to the dish concentrator was changed, the flux uniformity of the receiver could continue to improve. When the surface absorptivity of the receiver was reduced, the optical efficiency would be reduced. For the parabolic dish concentrator with different focal distance, the concave quartz window can also improve the uniformity of the flux distribution of the cylindrical cavity receiver.

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Section: Methodology and Model Validationsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Improvement in the Flux Uniformity of the Solar Dish Concentrator System through a Concave Quartz Window

Nie

Peng

Yan

et al. 2020

International Journal of Photoenergy

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“…Finally, by solving Equations (16) and (17) at the same time using the Newton-Raphson Method [37], and having the same number of the equations and unknown parameters, amounts of the . Q net, n , and T s,n for each element are determined.…”

Section: Methods To Determine the Optimum Structure Of Receivermentioning

confidence: 99%

“…Much research has numerically and experimentally investigated cavity receivers as the solar absorber in solar concentrators. Yan et al [17] optimized a cylindrical cavity receiver as the solar receiver of a dish concentrator. They presented a new type of dish concentrator as the solar concentrator with some discrete mirrors.…”

Section: Introductionmentioning

confidence: 99%

Study of PTC System with Rectangular Cavity Receiver with Different Receiver Tube Shapes Using Oil, Water and Air

et al. 2020

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Today, application of cavity receivers in solar concentrator systems is suggested as an interesting and novelty research subject for increasing thermal performance. In this research, a parabolic trough concentrator (PTC) with a rectangular cavity receiver was energetically investigated. The cavity receiver was studied with smooth and corrugated tubes. Different solar heat transfer fluids were considered, including water, air, and thermal oil. The effect of different operational parameters, as well as structural parameters, was investigated. The results showed that the linear rectangular cavity receiver with corrugated tube showed higher amounts of the absorbed heat and energy performance compared to the smooth tube as the cavity tube. Thermal performance of the rectangular cavity was improved using the application of water as the solar heat transfer fluid, which was followed by thermal oil and, finally, air, as the solar heat transfer fluid. Finally, it could be recommended that the rectangular cavity receiver with smooth tube using air as the solar heat transfer fluid is more appropriate for coupling this system with a Bryton cycle, whereas the rectangular cavity receiver with the corrugated tube using water or oil as the solar heat transfer fluid is recommended for achieving higher outlet temperature of the heat transfer fluid.

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“…Optimizing the optical and the thermal performance of the parabolic trough concentrator is highly important and a concern of several studies. Some of the notable approaches to address these problems created by the nonuniform distribution of solar flux are as follows: integration of inner helical fins into the tube, increased surface roughness and integration of helical swirl generators into the absorber tube, unilateral milt‐longitudinal vortexes enhanced parabolic trough reflector, injection of metal foams into the absorber pipe, replacement of a steel absorber pipe with a copper thermal receiver, a copper and steel bimetallic absorber, and cavity absorber . All of these studies have concentrated on improving the heat transfer between the working fluid and the thermal receiver or replacement of absorber tube with a better one with enhanced thermal properties.…”

Section: Introductionmentioning

confidence: 99%

Design, modeling, and optimization of a dual reflector parabolic trough concentration system

Maatallah

Ammar

2020

Int J Energy Res

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Summary The aim of the present work is to enhance the thermal management avoiding the high‐thermal stress on the outer surface of the parabolic trough receiver (PTR) derived from nonuniform concentrated solar flux distribution. A parabolic trough concentrating (PTC) system with second homogenizing reflector (HR) is numerically designed and optimized to ensure a uniform concentrated solar flux on the PTR walls. For this purpose, a three‐dimensional optical model has been developed to analyze quantitatively the improvement made by the HR using the optical efficiency and qualitatively basing on the uniformity of the solar flux density distribution over the entire surface of the PTR. The validation of the numerical tool is presented, and the algorithm of the design process has been proposed and detailed. As a preliminary trait, it was revealed that the peak of the designed system performance is achieved with a rim angle of 68° avoiding simultaneously the aberration and the blocking effects. Despite the optical efficiency decrease by about 7% compared with the conventional PTC design, the uniformity of the solar flux distribution has been strongly improved such that the maximum local solar flux density gradient is decreased from 80 to 11 kW/m2 equivalent to a decrease of 86.25% with respect to the conventional PTC and the average local density is about 25.5 kW/m2.

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Optimization of a discrete dish concentrator for uniform flux distribution on the cavity receiver of solar concentrator system

Cited by 60 publications

References 46 publications

Improvement in the Flux Uniformity of the Solar Dish Concentrator System through a Concave Quartz Window

Improvement in the Flux Uniformity of the Solar Dish Concentrator System through a Concave Quartz Window

Study of PTC System with Rectangular Cavity Receiver with Different Receiver Tube Shapes Using Oil, Water and Air

Design, modeling, and optimization of a dual reflector parabolic trough concentration system

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