An experimental study of the effect of exfoliated graphite solar coating with a sensible heat storage and Scheffler dish for desalination

Chandrashekara, M.; Yadav, Avadhesh

doi:10.1016/j.applthermaleng.2017.05.058

Cited by 40 publications

(11 citation statements)

References 29 publications

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“…Scheffler solar concentrator has gained popularity for water distillation and steam based applications. A study carried out by Chandrashekara and Yadav [23] showed a 9% improvement in desalination efficiency with graphite coating on the receiver. The authors claimed that they have achieved 40.00% efficiency for water desalination.…”

Section: Resultsmentioning

confidence: 99%

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Experimental performance analysis of an improved receiver for Scheffler solar concentrator

Malwad¹,

Tungikar²

2020

SN Appl. Sci.

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Section: Resultsmentioning

confidence: 99%

“…Energy analysis revealed an average thermal efficiency of 56.21% for water heating with average beam radiation 750 W/m 2 . Chandrashekara and Yadav [22,23] have evaluated the thermal performance of exfoliated graphite coated flat receivers. They have carried out experiments using 2.7 m 2 Scheffler reflector for water desalination.…”

Section: Introductionmentioning

confidence: 99%

Experimental performance analysis of an improved receiver for Scheffler solar concentrator

Malwad¹,

Tungikar²

2020

SN Appl. Sci.

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“…The main parameters measured in this study were the solar radiation, tracking angle, and the flux density distribution on the diffuse flat receiver. The main errors were likely to be related to instrumentation issues (sensitivity and measurement inaccuracy), which can be calculated from Equation (1) [23]. Errors associated with the measuring instruments are shown in Table 1.…”

Section: The Optical Experimental Analysis Of a Fixed-focus Fresnel Lmentioning

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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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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“…This system was able to produce 6.5 L of steam per day and per area unit from SSC. Chandrashekara and Yadav (2017) described an improvement of the receiver applied to another desalination system. A selective material (exfoliated graphite) was tested on absorber surface.…”

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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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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An experimental study of the effect of exfoliated graphite solar coating with a sensible heat storage and Scheffler dish for desalination

Cited by 40 publications

References 29 publications

Experimental performance analysis of an improved receiver for Scheffler solar concentrator

Experimental performance analysis of an improved receiver for Scheffler solar concentrator

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

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

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