Concentrations of the Linear Fresnel Reflector with the Facets Orientated to the Immovable Receiver

Klychev, Sh. I.; Zakhidov, R. A.; Bakhramov, S. A.; Khuzhanov, R.; Klychev, Z. Sh.

doi:10.3103/s0003701x10030138

Appl. Sol. Energy

2010

DOI: 10.3103/s0003701x10030138

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Concentrations of the Linear Fresnel Reflector with the Facets Orientated to the Immovable Receiver

Sh. I. Klychev¹,

R. A. Zakhidov

S. A. Bakhramov

et al.

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Cited by 7 publications

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“…Currently, SES uses a concentrator scheme of linear Fresnel mirrors (LFMs) with sphero cylindrical facets. In [2], the calculation of the param eters and concentrating characteristics of such MFs with parabolic and spherocylindrical facets was carried out, and the possibility of ensuring the uniformity of the concentrated stream was considered.…”

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Optical-geometric parameters of a linear Fresnel mirror with flat facets

2014

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Optical-geometric parameters of a linear Fresnel mirror with flat facets

2014

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Effect of secondary reflector on solar flux intensity and uniformity of a Fresnel concentrator

Minaeian

Alemrajabi

Chavoshi

et al. 2020

Journal of Renewable and Sustainable Energy

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Nowadays, consumption of renewable energies such as solar energies is increasing. Electricity in solar systems is produced using either photovoltaics or concentrated solar power (CSP) systems. Therefore, concentrating technologies are key parts of CSP systems. The lower cost of linear Fresnel collectors makes them attractive for electricity production and thermal energy applications. However, due to partly losing the reflected rays, their optical efficiency is low. By installing a secondary reflector above the absorber tube of Fresnel collectors, lost rays are mostly redirected toward the absorber tube and a higher optical efficiency is achieved. The geometry and configuration of secondary reflectors have an intense influence on the optical efficiency. Therefore, there is a need to determine the most appropriate shape and configuration of secondary reflectors. In this study, four different types and orientations of secondary reflectors including circular, flat, few segmented, and parabolic were investigated and compared optically. All the geometric parameters were optimized for each case individually. To calculate the solar flux intensity and uniformity on the absorber tube, a ray-tracing method was implemented using a mathematical code that was developed based on MATLAB software. All the secondary reflectors were simulated in the code, with variable geometrical parameters. A wide range of geometrical parameters were investigated to obtain the most efficient geometry of every secondary reflector design in flux intensity and flux uniformity in comparison with the other cases. The results showed that few flat segmented collectors increase the flux to 87.9%. In addition, the highest uniformity of solar flux was obtained by using the circular and parabolic secondary reflectors. Considering the manufacturing cost as an important parameter, the flat reflector was the favorable one from the flux quantity point of view. Finally, if all the three criteria, i.e., flux quantity, its distribution, and manufacturing cost, were essential to be considered, the flat reflector might be chosen as the most appropriate secondary reflector.

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Exergy and exergoeconomic investigations of the secondary reflectors effect on the linear Fresnel concentrator applied to an organic Rankine cycle

Chavoshi

Minaeian

2021

Journal of Renewable and Sustainable Energy

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Loss of solar rays in linear Fresnel concentrators (LFCs) through the width difference of primary reflectors and absorber tube led the scientists to add secondary reflectors to these concentrators. This secondary reflector increases the optical efficiency, as it is mentioned in the literature. In this paper, the effect of the secondary reflector on energy and exergy efficiencies was investigated. To find the most efficient design, four orientations of secondary reflectors including circular, flat, few segmented, and parabolic were studied. The reference values for the thermodynamic properties for all types of secondary reflectors were considered, and the systems were simulated in the EES environment by applying the supposed parameters at the base point. The results showed that lack of secondary reflectors decreased the thermal efficiency of the system. It is found that the flat geometry increased the energy and exergy efficiencies, while the cost was increased. However, the low manufacturing cost makes it acceptable as it was appropriate in optical aspects. The energy and exergy efficiencies were enhanced in circular and parabolic designs less than that in the flat design. The few flat segmented model has the most energy efficiency. However, much increment in efficiencies justifies growth in costs. The parabolic secondary reflector had the least cost increment. Effects of the variations of the temperature of the inlet flow to the collector, the pressure of the inlet flow to turbine, and the pressure of the inlet flow to the first pump on the design parameters were investigated. The results demonstrated that the only benefit increasing the temperature of the inlet flow to the collector and the pressure of the inlet flow to the first pump is cost reduction. Also, the increment of the pressure of the inlet flow to the turbine increases the exergy efficiency.

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Concentrations of the Linear Fresnel Reflector with the Facets Orientated to the Immovable Receiver

Cited by 7 publications

References 1 publication

Optical-geometric parameters of a linear Fresnel mirror with flat facets

Optical-geometric parameters of a linear Fresnel mirror with flat facets

Effect of secondary reflector on solar flux intensity and uniformity of a Fresnel concentrator

Exergy and exergoeconomic investigations of the secondary reflectors effect on the linear Fresnel concentrator applied to an organic Rankine cycle

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