The Review of Studies on Scheffler Solar Reflectors

Islam, Qamar Ul; Khozaei, Fatemeh

doi:10.1007/978-3-030-42363-6_69

Cited by 7 publications

(8 citation statements)

References 21 publications

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“…There are various articles discussing how to design and build Scheffler mirrors, for the geometric-mechanical aspects [3][4] or considering the mathematical approach [5]. Some examples of applications could be found in the literature, especially for desalination purposes, solar cooking, agriculture [6], and to produce electricity [7,8]. In a recently published article [9], we have indicated the phases for the optical design of the system considering the deformations that must be implemented in order to be able to use only one parabolic concentrator during the year.…”

Section: Introductionmentioning

confidence: 99%

Design of a Scheffler Mosaic Mirror by Optical Raytracing and CAD Software

Sansoni,

Fontani,

Francini

et al. 2023

SolarPACES Conf Proc

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The Scheffler reflector is a parabolic metal concentrator, typically applied in solar thermal systems with receiver fixed to the ground. The Scheffler mirror is deformed during the year to optimize its solar light collection. For practical reasons it is useful to manufacture such a curve reflector as mosaic mirror. This study develops a configuration of the mosaic mirror type starting from the continuous mirror, trying to indicate how the reflector can be designed. Combining a CAD software tool with raytracing simulations, the optical performance of the Scheffler mosaic mirror is compared with a continuous Scheffler collector. The CAD software reproduces the mechanical deformations of a real Scheffler reflector; while the raytracing software simulates the image that the Scheffler reflector concentrates on the receiver. However, the characteristics of the final composed reflector must be revised depending on the receiver requirements. Moreover, the sizing of the elementary mirrors must be chosen considering the final receiver and it also depends on economic considerations.

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Section: Introductionmentioning

confidence: 99%

Design of a Scheffler Mosaic Mirror by Optical Raytracing and CAD Software

Sansoni,

Fontani,

Francini

et al. 2023

SolarPACES Conf Proc

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“…In the literature there are various examples of applications, especially for desalination purposes, solar cooking, agriculture [6], and for the production of electricity [7,8].…”

Section: Introductionmentioning

confidence: 99%

Optical Raytracing Analysis of a Scheffler Type Concentrator

et al. 2021

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The Scheffler type concentrator is a curved metal reflector particularly suitable for solar thermal systems with a receiver fixed to the ground. Its operating principle is to deform the reflector throughout the year to optimize its performance in collecting sunlight. This study analyses the optical performance of a Scheffler reflector during the year. A CAD software tool is utilized to reproduce the mechanical deformations of a real Scheffler concentrator and the shape of the light spot on the receiver is analyzed by means of raytracing simulations. The starting configuration is the equinoctial paraboloid, which produces a point-like spot on the two equinox days only. On all other days of the year, this paraboloid is deformed in a suitable way in order to keep the spot as small as possible, but, even so, it is no longer a point-like spot. In the present work the simulated light distributions on the receiver, generated by the paraboloids (deformed or original), are compared. The results confirm the working principle of the Scheffler type concentrator and allow correctly sizing the receiver.

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“…Thanks to a tracking system following the solar azimuth and declination, the point of concentration of the solar radiation is at the same place throughout the day [5]. Scheffler concentrators with movable reflectors and fixed focus are mainly used for direct cooking or steaming applications and are capable of increasing the receiver temperature up to 200°C [6]. An average cooking power of 2.2 kW was obtained with an 8 m 2 reflector equipped with single mirrors for a solar irradiance of 700W/m 2 and an optical efficiency of 75% [7].…”

Section: Introductionmentioning

confidence: 99%

“…Concentrators with 0.5 to 2.7 m 2 of reflective surface are suitable for home use. Sizes of 7 m 2 ; 8 m 2 ; 9.7 m 2 ; 12.6 m 2 and 16 m 2 are commonly used for school canteen and industrial applications [6]. The technology has evolved significantly with 16 m 2 to 50 m 2 reflectors installed mostly in India [8].…”

Section: Introductionmentioning

confidence: 99%

“…The technology has evolved significantly with 16 m 2 to 50 m 2 reflectors installed mostly in India [8]. Most of the improvements have been in the form of added functionality, either in the size or shape of the reflectors or in the receivers or tracking mechanisms [6]. The literature review shows that the applications of the technology are quite diverse, including power generation, steam generation, heat storage, distillation, and desalination [9].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of Polyethylene Fusion by Scheffler Solar Concentrator

Dabilgou¹,

Ouédraogo²,

Ouédraogo³

et al. 2021

PSIJ

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Aims: The present work is the use of Scheffler technology to melt plastic waste to produce composite materials using an oven type receiver. The composite material in this study contains polyethylene as a matrix and sand as reinforcement. Study Design: The fusion temperature of polyethylene is about 200°C and is obtained by solar concentration. The experimental plastic melting unit in Saaba (latitude 12.38° N; longitude -1.43° E), Burkina Faso, uses two 8 m² Scheffler concentrators sharing a cubic receiver. Three types of mirrors with a reflectivity of at least 90% are used as reflecting facets to equip the Scheffler dishes at the site. Methodology: The thermal behavior of the receiver is analyzed experimentally. Temperatures are measured on the inner and outer walls as well as the internal air temperature with 5 K-type thermocouples. When the fusion temperature is reached on the inside, we introduce the plastic waste which has been previously washed, crushed, dried and weighed. Results: The installed model obtained an average energy of 1.80 kW at the receiver and an average internal temperature of 251.15°C for an average irradiance of 623 W/m² during the no-load test. During the load test, an average energy of 1.34 kW and an internal temperature of 206.4°C were reached for an average irradiance of 473 W/m² and an optical efficiency of 56%. This test led to the production of two pavers of the composite material matrix with 2.2 kg of plastic waste. Conclusion: These results show that the profiles of the primary reflector, tracking system, and tilt axis are accurate and the maximum concentrated solar flux converges on the absorbing surfaces of the receiver. The tempered panes of the absorbing surfaces is more transparent and less emissive. Thus our device contributes to the valorization of plastic waste by using a non-polluting energy source.

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The Review of Studies on Scheffler Solar Reflectors

Cited by 7 publications

References 21 publications

Design of a Scheffler Mosaic Mirror by Optical Raytracing and CAD Software

Design of a Scheffler Mosaic Mirror by Optical Raytracing and CAD Software

Optical Raytracing Analysis of a Scheffler Type Concentrator

Experimental Study of Polyethylene Fusion by Scheffler Solar Concentrator

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