About the relevance of particle shape and graphene oxide on the behavior of direct absorption solar collectors using metal based nanofluids under different radiation intensities

Campos, Carlos; Vasco, Diego A.; Angulo, Carolina; Burdiles, Patricio A.; Cardemil, José M.; Palza, Humberto

doi:10.1016/j.enconman.2018.12.007

Cited by 65 publications

(21 citation statements)

References 65 publications

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“…Moreover, they also showed that the optical absorption of metallic NPs could be improved more by merging with graphene. Recently, different research groups synthesized nanofluids based on spherical silver, gold, and copper NPs, covered by graphene oxides (GO) structures and studied their thermal absorption behavior under the sunlight [ 128 ]. These results demonstrated that the new nanostructured materials could convert solar energy to thermal energy under low and high solar irradiation.…”

Section: Resultsmentioning

confidence: 99%

Biosynthesis of Silver Nanoparticles and Their Applications in Harvesting Sunlight for Solar Thermal Generation

et al. 2021

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Silver (Ag) nanoparticles (NPs) have been synthesized through an easy, inexpensive, and ecofriendly method. Petroselinum crispum, parsley, leaf extract was utilized as a reducing, capping, and stabilizing agent, without using any hazardous chemical materials, for producing Ag NPs. The biosynthesized Ag NPs were characterized using different characterization techniques, namely UV-Vis, FT-IR spectroscopy, X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), dynamic light scattering (DLS), zeta potential, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), transmission electron microscope (TEM), field emission scanning electron microscopy (FESEM), and energy-dispersive X-ray (EDX) analysis to investigate the optical, thermal, structural, morphological, and chemical properties of the plant extract and the biosynthesized Ag NPs. After that, the biosynthesized Ag NPs were utilized in harvesting sunlight for solar thermal generation. Surface plasmon resonance (SPR) for the green synthesized Ag NPs with the dark color were adjusted at nearly 450 nm. Once the Ag NPs are excited at the SPR, a large amount of heat is released, which causes a change in the local refractive index surrounding the Ag NPs. The released heat from the Ag NPs under the solar irradiation at the precise wavelength of plasmon resonance significantly increased the temperature of the aqueous medium. Different percentages of Ag NPs were dispersed in water and then exposed to the sunlight to monitor the temperature of the suspension. It was found that the temperature of the aqueous medium reached its highest point when 0.3 wt. % of Ag NPs was utilized. This investigation is rare and unique, and it shows that utilizing a small amount of the biosynthesized Ag NPs can increase the temperature of the aqueous medium remarkably.

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Section: Resultsmentioning

confidence: 99%

Biosynthesis of Silver Nanoparticles and Their Applications in Harvesting Sunlight for Solar Thermal Generation

et al. 2021

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“…Verma [57] evaluated the performance of water-based CuO/MWCNT mixture nanofluids and water-based MgO/MWCNT mixture nanofluids for flat plate collectors. The results show that the optimal operating conditions of the plate collector occur at a mass flow rate of 0.025-0.03 kg/s, and the nanoparticle concentration Nanoparticle shape and type have an effect on the heat transfer of direct absorption solar collectors [54]. At room temperature, the thermal conductivity of nanofluids is 0.4% higher than that of pure water.…”

Section: Nanofluid In the Collectormentioning

confidence: 97%

“…In the case of thermal application, solar devices absorb the solar radiant energy incident on its surface; transform it into heat and transfer the heat to the working fluid flowing through them. Nanoparticle shape and type have an effect on the heat transfer of direct absorption solar collectors [54]. At room temperature, the thermal conductivity of nanofluids is 0.4% higher than that of pure water.…”

Section: Nanofluid In the Collectormentioning

confidence: 99%

Effect of Nanofluids on Boiling Heat Transfer Performance

Yao

Teng

2019

Applied Sciences

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At present, there are many applications of nanofluids whose research results are fruitful. Nanofluids can enhance the critical heat flux, but the effect on boiling heat transfer performance still has disagreement. Base liquids with higher viscosity improve the boiling heat transfer performance of nanofluids. When the base liquid is a multicomponent solution, the relative movement between the different solutions enhances the microscopic movement of the nanoparticles due to the different evaporation order during the boiling process, so that the boiling heat transfer performance is enhanced. Compared with the thermal conductivity of the heated surface, the deposition of the low thermal conductivity nanoparticles reduces the heat dissipation rate of the heated surface and improves the wall superheat. Then the enhancement of the boiling heat transfer coefficient should be attributed to the thermal conductivity improvement of base fluid and the bubble disturbance resulted from the nanoparticle’s microscopic motion.

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“…Reduction in particle size result in enhancement in thermal conductivity. Campos et al [28] studied spherical and non-spherical based nanofluid for direct absorption solar collector. This paper shows that enhancement in thermal conductivity of non-spherical shape nanoparticle is relatively more than spherical nanoparticle.…”

Section: Factors Affecting Heat Transfer Rate Of Nanofluidmentioning

confidence: 99%

Comparison of mathematical models to estimate the thermal conductivity of TiO2-water based nanofluid: A review

Dandoutiya

Kumar

2022

THERM SCI

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Heat transfer is a desirable phenomenon in many industries such as in refrigeration, transportation, power generation, cell preservation, incubator, metallurgy and material processing, health services, etc. Different types of fluids like water, oil, ethylene glycol etc are being used as a heat transfer medium. Water is a commonly used as working fluid for transfer of heat. Nanofluids are developed by adding nano sized particle(s) in existing fluid to improve the heat transfer rate. Thermal conductivity of the nanofluid is an important parameter in estimation of heat transfer rate. Different types of mathematical models were developed by various investigators to predict the thermal conductivity of the nanofluids. In this review paper,the theoretical and mathematical model(s) have been compared to predict the thermal conductivity of nanofluids. The experimental data have been collected from literature and compared with Maxwell model, Hamilton and crosser(H-C) model, Maxwell-Garnetts(MG) model, Pak cho model, Timofeeva et al. model, Li and Peterson model, Bhattacharya et al. model respectively in detail. It has been observed that the prediction wih the help of the mathematical models is good when the value of volume fraction was less than 0.01.

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About the relevance of particle shape and graphene oxide on the behavior of direct absorption solar collectors using metal based nanofluids under different radiation intensities

Cited by 65 publications

References 65 publications

Biosynthesis of Silver Nanoparticles and Their Applications in Harvesting Sunlight for Solar Thermal Generation

Biosynthesis of Silver Nanoparticles and Their Applications in Harvesting Sunlight for Solar Thermal Generation

Effect of Nanofluids on Boiling Heat Transfer Performance

Comparison of mathematical models to estimate the thermal conductivity of TiO2-water based nanofluid: A review

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