Design and experimental analysis of a cylindrical compound Fresnel solar concentrator

Zheng, Hongfei; Cao, Feng; Su, Yuehong; Dai, Jiao; Ma, Xinglong

doi:10.1016/j.solener.2014.05.010

Cited by 40 publications

(15 citation statements)

References 18 publications

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“…where E rec,ref is the total energy received by the receiver in the reference group. The threshold of the proposed FFFSC on the validity of fixed-focus performance that depends on the relative optical efficiency loss of FFFSC is 10%, which meets the general requirements of the solar concentrator [26]. Table 2 indicates experimental optical characteristics of the FFFSC under different apparent solar times measured in this work.…”

Section: Error =mentioning

confidence: 69%

“…The requirement for tracking precision means the maximum acceptance angle that is allowed in tracking, and it is a main factor that influences the performance of the FFFSC. The acceptance angle is defined as the error angle at which the relative optical efficiency loss of the FFFSC is less than 10% [26]. In this experiment, the Fresnel lens was kept fixed for a period, while the change of the focal spot was recorded every minute using the CCD camera.…”

Section: Tracking Precision Requirementmentioning

confidence: 99%

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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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Section: Error =mentioning

confidence: 69%

Section: Tracking Precision Requirementmentioning

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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“…Currently, the technology of linear Fresnel reflectors have attracted many researchers and it is under the process of developing . So numerous investigations have been conducted to evaluate and enhance the performance of LFR . The characteristics’ performance and design of linear Fresnel reflectors with a flat vertical absorber were examined .…”

Section: Solar Thermal Power Generation Systems With Various Solar Comentioning

confidence: 99%

“…25,[55][56][57][58][59][60][61][62][63][64] So numerous investigations have been conducted to evaluate and enhance the performance of LFR. [69][70][71]75 The characteristics' performance and design of linear Fresnel reflectors with a flat vertical absorber were examined. 76 The parameters which included in the analysis are aperture diameter of the concentrator, the effect of changes in the absorber height from the concentrator plane, width of the absorber and the width of the mirror components on the concentration on the absorber surface.…”

Section: Linear Fresnel Reflector Analysismentioning

confidence: 99%

Solar power technology for electricity generation: A critical review

Ahmadi

Ghazvini

Sadeghzadeh

et al. 2018

Energy Science & Engineering

316

111

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Negative environmental impact of fossil fuel consumption highlight the role of renewable energy sources and give them a unique opportunity to grow and improve. Among renewable energy sources solar energy attract more attention and many studies have focused on using solar energy for electricity generation. Here, in this study, solar energy technologies are reviewed to find out the best option for electricity generation. Using solar energy to generate electricity can be done either directly and indirectly. In the direct method, PV modules are utilized to convert solar irradiation into electricity. In the indirect method, thermal energy is harnessed employing concentrated solar power (CSP) plants such as Linear Fresnel collectors and parabolic trough collectors. In this paper, solar thermal technologies including soar trough collectors, linear Fresnel collectors, central tower systems, and solar parabolic dishes are comprehensively reviewed and barriers and opportunities are discussed. In addition, a comparison is made between solar thermal power plants and PV power generation plants. Based on published studies, PV‐based systems are more suitable for small‐scale power generation. They are also capable of generating more electricity in a specific area in comparison with CSP‐based systems. However, based on economic considerations, CSP plants are better in economic return.

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“…Similarly, solar CPV device using LFR concentrator had relatively higher solar concentrating uniformity than that of the parabolic trough concentrator at same geometric concentration ratio [36]. Zheng et al (2014) devised a cylindrical compound Fresnel solar concentrator consisting of an arched Fresnel lens, a Fresnel mirror, and a secondary reflector and achieved up to 84% optical efficiency [37]. Sahin et al (2019) proposed two-stage optical systems composed of a Fresnel lens with an aspherical surface as a primary element and a planar element with a diffractive surface as the second element.…”

mentioning

confidence: 96%

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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Design and experimental analysis of a cylindrical compound Fresnel solar concentrator

Cited by 40 publications

References 18 publications

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

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

Solar power technology for electricity generation: A critical review

Solar Concentrator Consisting of Multiple Aspheric Reflectors

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