Solar parabolic dish collector for concentrated solar thermal systems: a review and recommendations

Kumar, K. Harish; Daabo, Ahmed M.; Karmakar, Malay; Hirani, Harish

doi:10.1007/s11356-022-18586-4

Cited by 35 publications

(19 citation statements)

References 111 publications

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“…However, the concurrent evolutionary responses for H 2 and O 2 are difficult because of the reverse reaction. 84 The reverse reaction happens when the acceptor and the donor are able to react with light-produced electrons, thereby decreasing the photocatalyst's quantities of agitated electrons and holes. Semiconductor I and semi- conductor II at the interface include a photocatalytic Z-scheme arrangement utilizing a solid electron mediator.…”

Section: Heterojunction Emergencementioning

confidence: 99%

Nanocomposite Marvels: Unveiling Breakthroughs in Photocatalytic Water Splitting for Enhanced Hydrogen Evolution

Kumar,

Prasad Singh,

Kumar

et al. 2024

ACS Omega

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An overview of the significant innovations in photocatalysts for H 2 development, photocatalyst selection criteria, and photocatalytic modifications to improve the photocatalytic activity was examined in this Review, as well as mechanisms and thermodynamics. A variety of semiconductors have been examined in a structured fashion, such as TiO 2 -, g-C 3 N 4 -, graphene-, sulfide-, oxide-, nitride-, oxysulfide-, oxynitrides, and cocatalyst-based photocatalysts. The techniques for enhancing the compatibility of metals and nonmetals is discussed in order to boost photoactivity within visible light irradiation. In particular, further deliberation has been carried out on the development of heterojunctions, such as type I, type II, and type III, along with Z-systems, and S-scheme systems. It is important to thoroughly investigate these issues in the sense of visible light irradiations to enhance the efficacy of photocatalytic action. In fact, another advancement in this area may include hiring mediators including grapheme oxide and metals to establish indirect Z-scheme montages with a correct band adjustment. The potential consideration of reaction chemology, mass transfer, kinetics of reactions, restriction of light diffusion, and the process and selection of suitable light and photoreactor also will optimize sustainable hydrogen output efficiency and selectivity.

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Section: Heterojunction Emergencementioning

confidence: 99%

Nanocomposite Marvels: Unveiling Breakthroughs in Photocatalytic Water Splitting for Enhanced Hydrogen Evolution

Kumar,

Prasad Singh,

Kumar

et al. 2024

ACS Omega

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“…where ϕ is the local latitude; ω is the solar hour angle; δ is the solar declination angle, which can be calculated by Equation (2).…”

Section: Theoretical Analysismentioning

confidence: 99%

“…1 The solar concentrator is critical equipment for an efficient and economical solar system, which can significantly enhance the power density of sunlight. 2 Among various solar concentrators, the linear-focusing Fresnel lens is expected to be widely used for solar concentration due to its lightweight, high optical efficiency, and cost-effectiveness. 3 However, the existent application scale of the linear-focusing Fresnel lens is tiny.…”

Section: Introductionmentioning

confidence: 99%

“…Solar energy bears the enormous potential to be used worldwide for electricity and heat generation because of its nonpolluting character and inexhaustible supply 1 . The solar concentrator is critical equipment for an efficient and economical solar system, which can significantly enhance the power density of sunlight 2 . Among various solar concentrators, the linear‐focusing Fresnel lens is expected to be widely used for solar concentration due to its lightweight, high optical efficiency, and cost‐effectiveness 3 .…”

Section: Introductionmentioning

confidence: 99%

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Optical and thermal performance of a uniaxial bidirectional tracked linear‐focusing Fresnel lens solar concentrator

Liang

Zheng

et al. 2022

Intl J of Energy Research

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Summary The focal length of linear‐focusing Fresnel lens changing with incident angle is unavoidable, which goes against high‐efficient solar energy collection. This paper proposes a uniaxial bidirectional tracked linear‐focusing Fresnel lens solar concentrator, which maintains the advantage of single‐axis tracking and meanwhile adapts to the focal length change. The uniaxial bidirectional tracker allows the Fresnel lens to track the sun axially and slide up or down to compensate for the focal length change throughout a day timely. A specially designed cylindrical Fresnel lens, which is mass‐produced, is taken for study. Optical simulations are conducted to illustrate the optical characteristics of the Fresnel lens. The results indicate that the concentrator can efficiently collect solar energy when the tilt incident angle is within 45°. Then, a theoretical analysis is conducted to evaluate the concentrator's annual effectiveness with different installation modes (Tacking latitude of N40° as an example). The results indicate that the effective working hours of the concentrator in the horizontal east‐west position reaches 6.8 h. Remarkably, when the concentrator is set in the south‐north orientation, the full daytime solar collection throughout the year can be achieved as its installation angle β reaches 20°. Ultimately, an experimental setup is developed, and the comparative experiments well demonstrate the effectiveness of the uniaxial bidirectional tracked linear‐focusing Fresnel lens solar concentrator.

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“…Both the deterioration of the environment and the benefits of human progress come with high costs that humanity must bear. Now, it is very necessary to make use of alternative or renewable sources of energy to slow the progression of climate change and slow the consumption of fossil fuels [2]. Renewable energy is depleting; solar energy is a solid solution due to its eco-friendly behaviour.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of a Flat Plate Solar Collector with Different Hybrid Nanofluids as Working Medium—A Thermal Modelling Approach

et al. 2023

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In this study, the performance of hybrid nanofluids in a flat plate solar collector was analysed based on various parameters such as entropy generation, exergy efficiency, heat transfer enhancement, pumping power, and pressure drop. Five different base fluids were used, including water, ethylene glycol, methanol, radiator coolant, and engine oil, to make five types of hybrids nanofluids containing suspended CuO and MWCNT nanoparticles. The nanofluids were evaluated at nanoparticle volume fractions ranging from 1% to 3% and flow rates of 1 to 3.5 L/min. The analytical results revealed that the CuO-MWCNT/water nanofluid performed the best in reducing entropy generation at both volume fractions and volume flow rate when compared to the other nanofluids studied. Although CuO-MWCNT/methanol showed better heat transfer coefficients than CuO-MWCNT/water, it generated more entropy and had lower exergy efficiency. The CuO-MWCNT/water nanofluid not only had higher exergy efficiency and thermal performance but also showed promising results in reducing entropy generation.

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Solar parabolic dish collector for concentrated solar thermal systems: a review and recommendations

Cited by 35 publications

References 111 publications

Nanocomposite Marvels: Unveiling Breakthroughs in Photocatalytic Water Splitting for Enhanced Hydrogen Evolution

Nanocomposite Marvels: Unveiling Breakthroughs in Photocatalytic Water Splitting for Enhanced Hydrogen Evolution

Optical and thermal performance of a uniaxial bidirectional tracked linear‐focusing Fresnel lens solar concentrator

Thermodynamic Analysis of a Flat Plate Solar Collector with Different Hybrid Nanofluids as Working Medium—A Thermal Modelling Approach

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