An experimental investigation on the performance of a flat-plate solar collector using eco-friendly treated graphene nanoplatelets–water nanofluids

Akram, Naveed; Sadri, Rad; Kazi, S.N.; Ahmed, S. M.; Zubir, Mohd Nashrul Mohd; Ridha, Mohd; Soudagar, Manzoore Elahi M.; Ahmed, Waqar; Arzpeyma, Mazdak; Tong, Goh Boon

doi:10.1007/s10973-019-08153-4

Cited by 89 publications

(23 citation statements)

References 45 publications

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“…Graphene is a single-atom-thick and two-dimensional carbon material of sp 2 hybridised carbon atoms, which possesses large surface area, and high electron carrying capacity [12][13][14][15][16]. Recently, it has attracted extensive attention because of its remarkable electronic, mechanical and thermal properties, and has shown promise for chemical sensing, electronics and molecular assembly [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Studies on binding of single‐stranded DNA with reduced graphene oxide–silver nanocomposites

Yang

Wang

et al. 2020

IET nanobiotechnol.

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The binding reaction of reduced graphene oxide-silver nanocomposites (rGO-AgNCs) with calf thymus singlestranded DNA (ssDNA) was studied by ultraviolet-visible absorption, fluorescence spectroscopy and circular dichroism (CD), using berberine hemisulphate (BR) dye as a fluorescence probe. The absorbance of ssDNA increases, but the fluorescence intensity is quenched with the addition of rGO-AgNCs. The binding of rGO-AgNCs with ssDNA was able to increase the quenching effects of BR and ssDNA, and induce the changes in CD spectra. All of the evidence indicated that there was a relatively strong interaction between ssDNA and rGO-AgNCs. The data obtained from fluorescence experiments revealed that the quenching process of ssDNA caused by rGO-AgNCs is primarily due to complex formation, i.e. static quenching. The increasing trend of the binding equilibrium constant (Ka) with rising temperature indicated that the binding process was an endothermic reaction. The calculated thermodynamic parameters showed that the binding process was thermodynamically spontaneous, and hydrophobic association played predominant roles in the binding of ssDNA to the surface of rGO-AgNCs.

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Section: Introductionmentioning

confidence: 99%

Studies on binding of single‐stranded DNA with reduced graphene oxide–silver nanocomposites

Yang

Wang

et al. 2020

IET nanobiotechnol.

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“…The enhancement of total collector efficiency gained from MgO-MWCNTs hybrid NF was higher by 25.1 % and 16.28 % when compared with the case of water and MgO/water NF, respectively. More investigations on the thermal performance of NFs employed for FPSCs are summarized in Table 2 [61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77].…”

Section: Application Of Nfs To Enhance Performance Of Fpscsmentioning

confidence: 99%

Single and Hybrid Nanofluids to Enhance Performance of Flat Plate Solar Collectors: Application and Obstacles

Al-Yasiri

Szabó

Arıcı

2020

Period. Polytech. Mech. Eng.

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Solar energy represents the best alternative for traditional energy sources used in many thermal energy systems. Among solar thermal systems, Flat Plate Solar Collectors (FPSCs) are the most utilized type implemented in low and medium-level thermal domestic applications. Recently, the usage of nanofluids (NFs) to enhance FPSCs is one of the newest technologies that has drawn the attention of researchers to improve the overall thermal efficiency of solar systems. This paper briefly reviews the recent studies carried on thermal performance enhancement of FPSCs by implementing NFs (single and hybrid NFs) considering the main influential parameters such as particle concentration, particle size, and collector area. Finally, the main obstacles reported by the researchers such as the instability, viscosity, concentration limit, corrosion effect and others are identified, which is believed to be useful for interested newcomers in this research area. Based on the studies investigated in this paper, NFs, even under low concentrations, can remarkably improve the energetic and exergetic efficiency of FPSCs.

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“…Nanofluids are commonly used in heat transfer units for performance enhancement of cooling fluids. Convective heat transfer using nanofluids, like Al 2 O 3 [ 37 , 38 , 39 ], ZrO 2 [ 39 , 40 ], CNT [ 41 , 42 ], CuO [ 38 ], Cu [ 38 ], and TiO 2 [ 43 , 44 ], have been investigated in numerical studies. Williams et al [ 39 ] investigated the heat transfer and pressure drop in horizontal tubes under turbulent flow conditions by performing experimental analysis on setup using alumina-water (Al 2 O 3 )- and zirconia-water (ZrO 2 )-based nanofluids.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Heat Transfer and Pressure Drop in Microchannel Heat Sink Using Al2O3 and ZrO2 Nanofluids

Khan¹,

Uddin²,

Akbar

et al. 2020

Nanomaterials

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A new micro heat exchanger was analyzed using numerical formulation of conjugate heat transfer for single-phase fluid flow across copper microchannels. The flow across bent channels harnesses asymmetric laminar flow and dean vortices phenomena for heat transfer enhancement. The single-channel analysis was performed to select the bent channel aspect ratio by varying width and height between 35–300 μm for Reynolds number and base temperature magnitude range of 100–1000 and 320–370 K, respectively. The bent channel results demonstrate dean vortices phenomenon at the bend for Reynolds number of 500 and above. Thermal performance factor analysis shows an increase of 18% in comparison to straight channels of 200 μm width and height. Alumina nanoparticles at 1% and 3% concentration enhance the Nusselt number by an average of 10.4% and 23.7%, respectively, whereas zirconia enhances Nusselt number by 16% and 33.9% for same concentrations. On the other hand, thermal performance factor analysis shows a significant increase in pressure drop at high Reynolds number with 3% particle concentration. Using zirconia for nanofluid, Nusselt number of the bent multi-channel model is improved by an average of 18% for a 3% particle concentration as compared to bent channel with deionized water.

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An experimental investigation on the performance of a flat-plate solar collector using eco-friendly treated graphene nanoplatelets–water nanofluids

Cited by 89 publications

References 45 publications

Studies on binding of single‐stranded DNA with reduced graphene oxide–silver nanocomposites

Studies on binding of single‐stranded DNA with reduced graphene oxide–silver nanocomposites

Single and Hybrid Nanofluids to Enhance Performance of Flat Plate Solar Collectors: Application and Obstacles

Investigation of Heat Transfer and Pressure Drop in Microchannel Heat Sink Using Al2O3 and ZrO2 Nanofluids

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