Ray Tracing Study to Determine the Characteristics of the Solar Image in the Receiver for a Scheffler-type Solar Concentrator Coupled with a Stirling Engine

Ruelas, José; Pando, Gabriel; Lucero, Baldomero; Tzab, Juan

doi:10.1016/j.egypro.2014.10.319

Cited by 14 publications

(11 citation statements)

References 5 publications

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“…Considering a perfect concentrator and perfect tracking system, Dib and Fiorelli found that the variations in aperture area reach the limits of +37% and -38% between both solstices, and when the image is smaller, the aperture area is larger and the concentrated ratio is highest. These results are similar to those in Ruelas et al (2014).…”

Section: Introductionsupporting

confidence: 91%

“…The effects of aperture area variations in the focal image size were studied mathematically by Dib and Fiorelli (2015), and by photogrammetry and Ray Tracing by Ruelas, Pando, Lucero, and Tzab (2014) Ruelas, Palomares, and Pando (2015). Considering a perfect concentrator and perfect tracking system, Dib and Fiorelli found that the variations in aperture area reach the limits of +37% and -38% between both solstices, and when the image is smaller, the aperture area is larger and the concentrated ratio is highest.…”

Section: Introductionmentioning

confidence: 99%

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Technical analysis of an oven with coupled receiver for scheffler solar concentrator tested under cloudy weather conditions

Dib¹,

Marques²,

Figueiredo³

et al. 2020

Acta Sci Technol

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Most of the solar collectors experiments are carried out under clear-sky conditions to evaluate the maximum performance of collectors, even though this condition is not critical for some uses, such as cooking. The optical and thermal performance of a solar oven heated by Scheffler concentrator is here analyzed in more adverse weather conditions. The receiver for conversion and heat transfer of the concentrated solar energy is coupled to an oven specially developed for this work. The Scheffler concentrator geometry is a lateral cut angled 43.23° of a paraboloid matrix, and it works in a two-axis tracking system, to always maintain its focal image at the stationary receiver with the progression of the Earth rotation and solar declination movements. A model for distributing the daily radiation over the hours is used to compare the results. The time-constant experimental method is considered. The heating and cooling tests were carried out at the official local time. The maximum temperature achieved by the absorber was 328°C, and the maximum average temperature in the oven was 150°C. The results for heat loss factor were evaluated, and the trends for thermal efficiency and optical efficiency factor were analyzed for the system considered.

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Section: Introductionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Technical analysis of an oven with coupled receiver for scheffler solar concentrator tested under cloudy weather conditions

Dib¹,

Marques²,

Figueiredo³

et al. 2020

Acta Sci Technol

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show abstract

“…The close-range photogrammetry and ray tracing method were used to study the image of concentrated rays on the absorber surfaces. Thermal imaging camera was also used to visualize the temperature distribution on the focus of the receiver [15][16][17]. When an uneven temperature distribution was experienced by the receiver, it lead to higher heat losses as well as thermal stresses on the receiver material and it may reduce the effective life of the receiver considerably by creep and expansion stresses.…”

Section: *mentioning

confidence: 99%

Effect of non-uniform temperature distribution on surface absorption receiver in parabolic dish solar concentrator

Senthil

Cheralathan

2017

THERM SCI

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A flat surface absorption receiver was experimentally investigated with a parabolic dish solar concentrator in order to study the effect of receiver temperature distribution on heat gain and losses. The addition of specially designed metal fins in the inner surface of the receiver surface side the receiver transfers the incident heat flux to heat transfer fluid. The receiver surface temperature increased with increase in concentration ratio, intensity of beam radiation, and ambient temperature, but decrease with wind speed. The absorptivity of black coated mild steel of 0.85 and also the 0.15 emissivity of mild steel reduced the heat loss from the surface and improved heat gain to heat transfer fluid. The temperature gradient between the receiver periphery and centre is around 150 o C. Fluid flow direction like straight and curved paths have been discussed for effective heat absorption and reduced operational duration. The thermal efficiency and operational duration were determined for a flow rate of 80 litres per hour through the receiver. Water flow though the curved path was observed with improved thermal efficiency of 3.8% and 20% reduction in operational duration when compared to the vertical flow through the receiver at same flow rate.

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“…The design of fixed focus solar concentrators was recently investigated in [13,14]. In 2013, the Solar World Congress presented a study about ray-tracing for fixed focus solar concentrators [15]. However, no study or methodology exists that can establish the absorber and receiver dimensions and parameters of a Stirling engine coupled to an STSC based on a solar image in the focal plane.…”

Section: Introductionmentioning

confidence: 99%

Absorber design for a Scheffler-Type Solar Concentrator

2015

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Ray Tracing Study to Determine the Characteristics of the Solar Image in the Receiver for a Scheffler-type Solar Concentrator Coupled with a Stirling Engine

Cited by 14 publications

References 5 publications

Technical analysis of an oven with coupled receiver for scheffler solar concentrator tested under cloudy weather conditions

Technical analysis of an oven with coupled receiver for scheffler solar concentrator tested under cloudy weather conditions

Effect of non-uniform temperature distribution on surface absorption receiver in parabolic dish solar concentrator

Absorber design for a Scheffler-Type Solar Concentrator

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