State-of-the-art review of nanofluids in solar collectors: A review based on the type of the dispersed nanoparticles

Xiong, Qingang; Hajjar, Ahmad; Alshuraiaan, Bader; Izadi, Mohsen; Altnji, Sam; Shehzad, Sabir Ali

doi:10.1016/j.jclepro.2021.127528

Cited by 129 publications

(19 citation statements)

References 236 publications

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“…The application of nanofluids in solar applications is attracting an increasing number of researchers due to their favourable characteristics in terms of high solar absorbance and good heat transfer performance [19]. Wang et al [20] studied the impact of nanofluids' optical properties (viz., absorption rate and irradiance direction) on the thermal performance of a direct absorption solar collector.…”

Section: Solar-thermal or Pv/t Collectorsmentioning

confidence: 99%

Solar energy utilisation: Current status and roll-out potential

Taylor

et al. 2022

Applied Thermal Engineering

104

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Section: Solar-thermal or Pv/t Collectorsmentioning

confidence: 99%

Solar energy utilisation: Current status and roll-out potential

Taylor

et al. 2022

Applied Thermal Engineering

104

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“…Nanoparticles tend to aggregate due to their high surface area [45,46]. Therefore, investigators recommended a two-step technique for preparing oxide nanofluids over those with metallic nanofluids [47][48][49]. The two-step technique is standard as the most cost-effective procedure for making nanofluids [50].…”

Section: Morphologies Of Spherical Nanoparticlesmentioning

confidence: 99%

Heat Transfer and Hydrodynamic Properties Using Different Metal-Oxide Nanostructures in Horizontal Concentric Annular Tube: An Optimization Study

et al. 2021

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Numerical studies were performed to estimate the heat transfer and hydrodynamic properties of a forced convection turbulent flow using three-dimensional horizontal concentric annuli. This paper applied the standard k–ε turbulence model for the flow range 1 × 104 ≤ Re ≥ 24 × 103. A wide range of parameters like different nanomaterials (Al2O3, CuO, SiO2 and ZnO), different particle nanoshapes (spherical, cylindrical, blades, platelets and bricks), different heat flux ratio (HFR) (0, 0.5, 1 and 2) and different aspect ratios (AR) (1.5, 2, 2.5 and 3) were examined. Also, the effect of inner cylinder rotation was discussed. An experiment was conducted out using a field-emission scanning electron microscope (FE-SEM) to characterize metallic oxides in spherical morphologies. Nano-platelet particles showed the best enhancements in heat transfer properties, followed by nano-cylinders, nano-bricks, nano-blades, and nano-spheres. The maximum heat transfer enhancement was found in SiO2, followed by ZnO, CuO, and Al2O3, in that order. Meanwhile, the effect of the HFR parameter was insignificant. At Re = 24,000, the inner wall rotation enhanced the heat transfer about 47.94%, 43.03%, 42.06% and 39.79% for SiO2, ZnO, CuO and Al2O3, respectively. Moreover, the AR of 2.5 presented the higher heat transfer improvement followed by 3, 2, and 1.5.

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“…Consequently, NFs open the door to the next generation of heat transfer fluids (HTF) with better thermal performance than the traditional fluids such as water, oils, molten salts or ethylene glycol, solving their relatively poor heat transfer characteristics. In the last years, NFs have been incorporated in many applications such as solar energy [ 5 , 6 ], geothermal [ 7 ], heat exchange [ 7 ], oil recovery [ 8 , 9 ], lubricants [ 10 , 11 ], refrigeration [ 12 ], desalination [ 13 ] or CO 2 capture [ 14 ], among others.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanoparticles on the Thermal Stability and Reaction Kinetics in Ionic Nanofluids

et al. 2022

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Nowadays, the incorporation of nanoparticles into thermal fluids has become one of the most suitable strategies for developing high-performance fluids. An unconventional improvement of thermo–physical properties was observed with the addition of 1% wt. of nanoparticles in different types of fluids, such as molten salts, allowing for the design of more thermally efficient systems using nanofluids. Despite this, there is a lack of knowledge about the effect that nanoparticles produce on the thermal stability and the decomposition kinetics of the base fluid. The present study performs IR- and UV-vis spectroscopy along with thermogravimetric analysis (TGA) of pure nitrate and nitrate based nanofluids with the presence of SiO2 and Al2O3 nanoparticles (1% wt.). The results obtained support that nanoparticles accelerate the nitrate to nitrite decomposition at temperatures below 500 °C (up to 4%), thus confirming the catalytic role of nanoparticles in nanofluids.

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State-of-the-art review of nanofluids in solar collectors: A review based on the type of the dispersed nanoparticles

Cited by 129 publications

References 236 publications

Solar energy utilisation: Current status and roll-out potential

Solar energy utilisation: Current status and roll-out potential

Heat Transfer and Hydrodynamic Properties Using Different Metal-Oxide Nanostructures in Horizontal Concentric Annular Tube: An Optimization Study

Effect of Nanoparticles on the Thermal Stability and Reaction Kinetics in Ionic Nanofluids

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