A novel 2-stage dish concentrator with improved optical performance for concentrating solar power plants

Wang, Jun; Yang, Song; Jiang, Chuan; Yan, Qianwen; Lund, Peter

doi:10.1016/j.renene.2017.02.059

Cited by 36 publications

(17 citation statements)

References 29 publications

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“…A series of detailed models were built, such as an optical efficiency model, acceptable solar radiation model, and thermal performance model [30]. Several innovative designs for the internal concentrating tubular absorber CPC have been proposed by [30,35,36]. Yuan et al [37] presented the temperature performance of an internal concentrating CPC with a heat pipe.…”

Section: Internal and External Concentrating Combined Cpcmentioning

confidence: 99%

A Review of the Compound Parabolic Concentrator (CPC) with a Tubular Absorber

Jiang

Yang

et al. 2020

Energies

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The compound parabolic concentrator (CPC) is a highly interesting solar collector technology for different low-concentration applications due to no tracking requirement. The CPC with a tubular absorber is the most common type of CPC. Here, a comprehensive state-of-the-art review of this CPC type is presented, including design features, structure, applications, etc. Key design guidelines, structural improvements, and recent developments are also presented.

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Section: Internal and External Concentrating Combined Cpcmentioning

confidence: 99%

A Review of the Compound Parabolic Concentrator (CPC) with a Tubular Absorber

Jiang

Yang

et al. 2020

Energies

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“…It makes use of variance reduction techniques to reduce the number of rays required to obtain a reliable result [29]. TracePro ® has been validated as a lighting design software, where it has been used in numerous research works as a part of the design process [29][30][31]. In Monte Carlo raytracing, scattering and diffraction are treated as random processes.…”

Section: The Optical Simulation Analysis Of the Fixed-focus Fresnel Lmentioning

confidence: 99%

Simulation and Experimental Study on the Optical Performance of a Fixed-Focus Fresnel Lens Solar Concentrator Using Polar-Axis Tracking

et al. 2018

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Most sun-tracking systems of solar concentrators are expensive, sensitive to operational costs, and complicated in optical design in which the receiver must be free to rotate about the axis. To overcome the aforementioned problems, this study presents a fixed-focus Fresnel lens solar concentrator (FFFSC) using polar-axis tracking which allows the Fresnel lens to concentrate sunlight to a fixed small heat-receiving area and the receiver remained fixed in location and rotation. Experimental research has been conducted to obtain the optical characteristics of the FFFSC for different solar times, tracking errors, and periodical adjustment errors. It has been found that maximum values of the relative optical efficiency loss (η re-opt,loss) and minimum value of the optical efficiency (η opt) of the FFFSC for different solar times are 1.87% and 71.61%, respectively. The mean value and maximum value of the local concentration ratio of the solar flux on the receiver are more than 86.64 and 1319.43, respectively. When the tracking error and periodical adjustment error are within 1 • , the η opt of the FFFSC can reach 70.38% and 68.94%, respectively. The optical characteristics of FFFSC is also verified numerically. Especially, according to the total year simulation of the FFFSC's optical characteristics, maximum value of η re-opt,loss is 0.116%, which means the proposed the FFFSC can achieve fixed-focus.

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“…Five different types of SMs can be identified: (i) Flat mirrors [32], (ii) ellipsoidal mirrors [33], (iii) hyperboloidal mirrors with upper sheet [34] and (iv) lower sheet [35], and (v) paraboloidal mirrors [36]. Based on (iii), a novel TSD with a unique hollow structure was presented to improve optical performance for CST dish systems [37,38].…”

Section: Introductionmentioning

confidence: 99%

Optical Design of a Novel Two-Stage Dish Applied to Thermochemical Water/CO2 Splitting with the Concept of Rotary Secondary Mirror

2020

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In this paper, a novel two-stage dish concentrator (TSD) with a rotary secondary mirror (SM) is presented for solar thermal water/CO2 splitting. An in-house code for ray-tracing simulation of the concentrator was developed and validated. Among all feasible geometries, a hyperboloid with an upper sheet is the most popular option and is widely used as a secondary reflector, which is mainly discussed here. All para-hyperboloid geometric combinations can be categorized into three typical patterns (φ1 < π/2, φ1 = π/2, φ1 > π/2, φ1=field angle of PM). The initial designs of the TSD, respective to different off-axis levels for each combination, were first designed. Then a new mathematical model was introduced to reshape the SM to reach optimal truncated designs. Finally, a new concept of an off-axis primary mirror (PM) combined with the truncated SM was evaluated by using the in-house ray-tracing code. The results include the optical efficiency, concentration ratio and intercepted radiant flux. The best solutions with the highest optical efficiency fall in the range π/2 ≤ φ1 ≤ (π − arcsin 0.8) rads and 0.4 ≤ NA2 ≤ 0.6 (NA2 = sin φ2, φ2=field angle of SM), which vary with the concentration ratio and inclination angle.

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A novel 2-stage dish concentrator with improved optical performance for concentrating solar power plants

Cited by 36 publications

References 29 publications

A Review of the Compound Parabolic Concentrator (CPC) with a Tubular Absorber

A Review of the Compound Parabolic Concentrator (CPC) with a Tubular Absorber

Simulation and Experimental Study on the Optical Performance of a Fixed-Focus Fresnel Lens Solar Concentrator Using Polar-Axis Tracking

Optical Design of a Novel Two-Stage Dish Applied to Thermochemical Water/CO2 Splitting with the Concept of Rotary Secondary Mirror

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