A review of studies using nanofluids in flat-plate and direct absorption solar collectors

Raj, Pankaj; Subudhi, Sudhakar

doi:10.1016/j.rser.2017.10.012

Cited by 174 publications

(40 citation statements)

References 98 publications

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“…Such systems include flat plate and volumetric absorption solar collectors. Applications of NPs and NFs in flat plate solar collectors are investigated [126][127][128][129][130], including experimental evaluation of flat plate solar collector [127]. Effect of titanium dioxide/water NF use on thermal performance of the flat plate solar collector has been investigated [128].…”

Section: Applications Of Nanoparticles and Nanofluids In Solar Thermamentioning

confidence: 99%

Modeling and analysis of optical properties of nanoparticles and nanofluids for effective absorption of solar radiation and their heating

Pustovalov

2019

SN Appl. Sci.

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This review presents a comprehensive analysis of the recent studies and advances related to optical properties of nanoparticles, their heating under solar irradiation and heat conversion, relevant equations and theoretical modeling approaches and application of nanofluids for direct absorption of solar radiation. A lot of papers including theoretical, numerical and experimental up-to-date works are reviewed and summarized carefully to give a panoramic overview of the role of the nanoparticles. Modern nanotechnology can produce various homogeneous and hybrid (core-shell) nanoparticles from different metals and materials which have unique optical and thermal properties. It was found that the application of nanoparticles selected on the basis of the presented analysis has shown remarkable properties and offers unique advantages over conventional fluids in optical absorption, thermo-physical and heating properties of nanofluids. This fact can play a crucial role in increasing the efficiency of solar energy harvesting.

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Section: Applications Of Nanoparticles and Nanofluids In Solar Thermamentioning

confidence: 99%

Modeling and analysis of optical properties of nanoparticles and nanofluids for effective absorption of solar radiation and their heating

Pustovalov

2019

SN Appl. Sci.

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“…They concluded that the stability and , 0 (201 Web of Conferences https://doi.org/10.1051/e3sconf/2019111010 9) 201 E3S 111 10 CLIMA 9 56 56 thermal conductivity are important performance parameters for solar collectors. Raj and Subudhi [16] reviewed the flat-plate and direct absorption solar collectors using nanofluids to identify optimum working conditions and affecting parameters (surfactant, collector area, particle type, particle size and base-fluid). They have concluded that long-term stability of nanofluid and nanoparticle dispersion affects sunlight absorption and the solar collector efficiency.…”

Section: Solar Collectorsmentioning

confidence: 99%

Carbon-based Nanofluid Applications in Solar Thermal Energy

2019

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Renewable energy sources such as solar, wind and geothermal are proposed as an alternative to fossil fuels whose excessive use causes global warming. The most popular one of the renewable energy sources is considered as solar energy due to the fact that required energy is provided by the sun entire year around the world. Solar energy systems convert the solar radiation to the useful heat or electricity. In order to achieve better performance in solar thermal systems many studies have been conducted. Some of these studies suggest that heat transfer fluid could be changed with the nanofluids which can be defined as new generation heat transfer fluid. Nanofluids are suspensions of nano-sized particles such as metals, metal-oxides, and Carbon-allotropes (C), in the conventional base-fluids (water, ethylene glycol and oil). Using nanofluid enhances the efficiency and thermal performance of solar systems due to their better thermophysical and optical properties. Recently, C-based nanofluids are getting attention due to their enhanced thermal conductivity and absorptivity at even low concentrations. The results show that C-based nanofluids have a potential to use in solar energy systems: solar collectors, solar stills, photovoltaic/thermal systems.

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“…The application of nanofluids in low‐temperature DASCs has been the focus of various experimental and theoretical/numerical studies . A comprehensive review of the subject is found in . Gorji and Ranjbar reviewed the optical properties and application of nanofluids in low and high heat flux DASCs.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of a direct absorption solar collector using copper oxide porous foam and nanofluid

Esmaeili

Karami

Delfani³

2020

Int J Energy Res

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The current research proposes the idea of using water-saturated metal oxide foams and water-based nanofluids as solar absorber in the direct absorption solar collectors (DASCs). Specifically, the novel solar collector design utilizes copper oxide (CuO) porous foam and nanoparticle with high optical properties and is expected to have enhanced thermal performance than the conventional collectors utilizing pure water. The finite volume technique is used to solve the governing equations of flow and heat transfer in the radiative participating media. Also, to establish the reliability and accuracy of numerical solutions, the obtained results are compared with the corresponding numerical and experimental data. The computations are carried out for different nanoparticle volume fractions, foam pore sizes, working fluid mass flow rates, and both porous layer thicknesses and positions (inserted at the lower or upper wall of the collector). It is found that the efficiency of DASC partially/fully filled with metal oxide foam is maximized when the collector is completely filled with it. Compared with the water flow, the numerical results show that the collector efficiency using CuO nanofluid and metal oxide foam is improved by up to 26.8% and 23.8%, respectively. Moreover, considering the second law of thermodynamics, the use of CuO nanofluids in the DASC seems to be more effective than the use of CuO porous foam. K E Y W O R D Sdirect absorption solar collector, efficiency, metal oxide foam, nanofluid, second law of thermodynamics

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A review of studies using nanofluids in flat-plate and direct absorption solar collectors

Cited by 174 publications

References 98 publications

Modeling and analysis of optical properties of nanoparticles and nanofluids for effective absorption of solar radiation and their heating

Modeling and analysis of optical properties of nanoparticles and nanofluids for effective absorption of solar radiation and their heating

Carbon-based Nanofluid Applications in Solar Thermal Energy

Performance enhancement of a direct absorption solar collector using copper oxide porous foam and nanofluid

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