Design and ray tracing of multifaceted Scheffler reflector with novel crossbars

Reddy, Desireddy Shashidhar; Khan, Mohd. Kaleem

doi:10.1016/j.solener.2019.04.083

Cited by 16 publications

(11 citation statements)

References 21 publications

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“…Later, Reddy et al 32 generalized these design principles for a Scheffler dish of any arbitrary size and provided simple design charts to aid the manufacturers in quickly estimating the dimensions of the elliptical rim and crossbars. Later, Reddy and Khan 33 proposed a new error-free crossbar design and compared it with the original crossbar design of Munir et al, 31 an approximation of the actual elliptical crossbar. However, the error in the original design was too small to make any impact on ray concentration.…”

Section: Scheffler Reflectormentioning

confidence: 99%

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Stationary point focus solar concentrators—A review

Reddy

Khan

2022

Intl J of Energy Research

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The innovation in concentrated solar power (CSP) systems is one of the many vital solutions to meet the ever-increasing global energy demands. Among various CSP systems, point focus solar concentrators can attain a higher concentration ratio and helps reduce the size of the receiver, resulting in higher operating temperatures, lower thermal losses, and higher system exergy. This article presents a review on a particular class of CSP systems known as stationary point focus solar concentrators, that is, point focus solar concentrators having a stationary receiver. They can be categorized as (a) Scheffler reflector, (b) Scheffler-type concentrator, (c) high temperature concentrator, (d) central tower receiver, and (e) CNRS solar furnace. Having a stationary receiver helps reduce the maintenance and simplifies the plumbing network for heat transfer fluid. However, low maintenance might be a tradeoff on the performance side. This review systematically collates the literature on stationary point focus solar concentrators. Also, the basics of solar angles and various solar tracking systems applicable to this class of CSP systems are covered. K E Y W O R D Scentral tower receiver, fixed focus solar concentrator, high-temperature concentrator, Scheffler reflector, Scheffler-type solar concentrator

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Section: Scheffler Reflectormentioning

confidence: 99%

“…A better concentration can be achieved with smaller mirror sizes as Figure 11 shows the ray tracing in the Soltrace software for a multifaceted Scheffler reflector profile, generated using the published codes of Reddy and Khan. 33…”

Section: Scheffler Reflectormentioning

confidence: 99%

Stationary point focus solar concentrators—A review

Reddy

Khan

2022

Intl J of Energy Research

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“…This effect is achieved by periodically changing the orientation and profile of a paraboloid calculated for the day of the Equinox [1][2]. 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].…”

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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“…A dimensão do corte influencia no tamanho e na curva de fluxo da imagem focal. Quanto maior for a dimensão de cada espelho maior será o tamanho da imagem do foco e maior será o achatamento do pico do fluxo no foco (JOHNSTON, 1998;REDDY;KHAN, 2019). Riveros-Rosas et al (2011) analisaram, por Ray Tracing, a variação do fluxo de energia solar na imagem focal em concentrador tipo prato parabólico com refletor feito de espelhos planos com diferentes dimensões de cortes.…”

Section: O Concentrador Solarunclassified

Análise da formação de imagem focal do concentrador solar paraboloidal tipo scheffler.

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As máximas 'Buscai e achareis' é análoga à 'Ajuda-te, e o céu te ajudará'. É o princípio da lei do trabalho, e, por conseguinte, da lei do progresso, porque o progresso é filho do trabalho, e o trabalho coloca em ação as forças da inteligência." Allan Kardec. AGRADECIMENTOSAgradeço a Deus pela oportunidade, força e condições para a realização deste trabalho.À minha esposa Tatiana e filhas Valentina e Victoria, pelo amor, paciência, compreensão e esperança depositado em mim durante este período.Aos meus pais, pelo amor incondicional direcionado a mim, em forma de educação e ensino dos valores de família e missões de vida.Aos meus avós, que me ensinaram o precioso valor da família e instalaram em minha memória preciosos conselhos: "o estudo é a luz da vida".À minha irmã, Gabriela, que ajudou a viabilizar a bancada deste trabalho.Ao professor Flávio Augusto Sanzovo Fiorelli pelo acolhimento e pela orientação bem direcionada com o objetivo no progresso deste trabalho.Ao professor Raul Gonzalez Lima, pela orientação em momentos críticos apoiando a continuidade deste projeto.Aos professores Guenther Carlos Krieger Filho e Sílvio de Oliveira Júnior pela ótima arguição na banca de qualificação deste trabalho.Ao professor Cláudio Roberto de Freitas Pacheco pelas horas de sábias orientações, não somente de engenharia solar, mas também de vida, pelo seu exemplo.A Isabel Kodama, pelo grande auxílio nos trabalhos experimentais e ajustes no texto da tese.Ao Gustavo Moreira Dias, pela grande ajuda nos trabalhos experimentais durante a pandemia.

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Design and ray tracing of multifaceted Scheffler reflector with novel crossbars

Cited by 16 publications

References 21 publications

Stationary point focus solar concentrators—A review

Stationary point focus solar concentrators—A review

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

Análise da formação de imagem focal do concentrador solar paraboloidal tipo scheffler.

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