Experimental study of exfoliated graphite solar thermal coating on a receiver with a Scheffler dish and latent heat storage for desalination

Chandrashekara, M.; Yadav, Avadhesh

doi:10.1016/j.solener.2017.05.027

Cited by 41 publications

(11 citation statements)

References 26 publications

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“…The excited electron will be promoted from the ground state (highest occupied molecular orbital, HOMO) to a higher energy orbital (lowest unoccupied molecular orbital, LUMO) when the photon energy of the incident light matches a possible electronic transition within the molecule, causing heat to be released when the excited electron relaxes back to its ground state (Figure 3C). 7,75 Because of their high light absorption across a wide range of wavelengths, relatively low cost, and high stability, various carbon materials have been investigated as light absorbers for solar evaporation, such as biomass-derived amorphous carbon, 76 graphene, [77][78][79][80][81][82][83][84] graphene oxide (GO)/reduced graphene oxide (rGO), 39,[85][86][87][88][89][90] carbon nanotubes (CNTs), [91][92][93] graphite, 30,[94][95][96] carbon black, 97 etc. In addition, carbon materials can be easily fabricated into various structures desirable for enhanced light absorption and integrated with diverse substrate materials and evaporation structures.…”

Section: Carbonaceous and Polymeric Materialsmentioning

confidence: 99%

Challenges and Opportunities for Solar Evaporation

Chen

Kuang

2019

Joule

1,090

647

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Solar evaporation is an ancient technology that has regained tremendous attention because of the abundance of solar energy, widely available water sources, and facile facilities in combination with substantial improvements of conversion efficiency enabled by improved photothermal materials, thermal management, and interfacial heating system designs in recent years. In this review, we discuss recent developments in photothermal materials, with a focus on their photothermal conversion mechanisms as light absorbers. We also explore the diverse structural design and engineering strategies that are being used to improve evaporation performance, including the design principles for high-efficiency light-to-heat conversion, optimization of thermal management, water transport, interface wettability, and anti-saltblocking structures. We describe the potential applications of this attractive technology in a variety of energy and environmental fields. The current challenges and future research opportunities are also discussed, providing a roadmap for the future development of solar evaporation technology.

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Section: Carbonaceous and Polymeric Materialsmentioning

confidence: 99%

Challenges and Opportunities for Solar Evaporation

Chen

Kuang

2019

Joule

1,090

647

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“…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 author achieved a 140 o C temperature of synthetic oil with a glazed receiver against 125 o C without glazing. Chandrashekara and Yadav [19,20] experimentally studied the effect of exfoliated graphite coating on a receiver with Scheffler concentrator. Exfoliated graphite coating improves the efficiency of the desalination system by 9% and 13% with sensible heat and latent heat storage system respectively.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance Analysis of Glazed and Unglazed Receiver of Scheffler Dish

Malwad

Tungikar

2020

Journal of Thermal Engineering

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The impact of reradiation and convection losses from the receiver is substantial on the performance of solar parabolic dish concentrator. In this paper, an experimental and theoretical study to compare the performance of the glazed and unglazed receiver of Scheffler dish for direct steam generation is presented. Tempered glass cover is provided on aperture to reduce the reradiation and convection losses from the receiver. Improvement in the efficiency of the Scheffler dish is found due to suppressed heat losses from the receiver front surface. Overall heat loss coefficient, useful energy transfer rate to water, steam flow rate, and efficiency of the system with and without glass cover on the receiver are evaluated and compared. The average solar beam intensity during experimentation was 569 W/m 2 and 600 W/m 2 with the glazed and unglazed receiver respectively. The average temperature at the receiver with glazing is recorded as 425 o C, even at low solar beam intensity in comparison with the unglazed receiver. Overall heat loss coefficient at the front surface of the receiver is reduced to 6.04 W/m 2 K. It has been observed that the Scheffler dish with a glazed receiver achieves thermal performance above 50.00% within the solar beam intensity range of 600-650 W/m 2. The enhancement of 8.74% in the average thermal efficiency, with glass cover on the receiver is achieved.

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Experimental study of exfoliated graphite solar thermal coating on a receiver with a Scheffler dish and latent heat storage for desalination

Cited by 41 publications

References 26 publications

Challenges and Opportunities for Solar Evaporation

Challenges and Opportunities for Solar Evaporation

Experimental performance analysis of an improved receiver for Scheffler solar concentrator

Thermal Performance Analysis of Glazed and Unglazed Receiver of Scheffler Dish

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