Enhanced solar thermal conversion and thermal conduction of MWCNT-SiO2/Ag binary nanofluids

Zeng, Jia; Xuan, Yi

doi:10.1016/j.apenergy.2017.12.083

Cited by 163 publications

(48 citation statements)

References 23 publications

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“…The thermal fluids have recommendable thermal properties; such nanofluids which have particularly favorable thermal conductivity compared with other base coolant fluids as oil, water, glycerine, etc. Since the thermohydraulic characteristics of nanofluids are worthy, therefore, different sorts of nanofluids are applied in many engineering applications—traditional and compact HSs, solar energy, heat pipes, thermal energy storage, and free and forced convection . However, these applications using nanofluids have some limitations that cannot be neglected.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional computational comparison of mini‐pinned heat sinks using different nanofluids: Part two—energy and exergy characteristics

Al‐damook

Alfellag

Khalil

2019

Heat Trans. Asian Res.

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The energy and exergy characteristics of 3D-pinned heat sink (HS) designs have been computationally compared as the second part of a three-part investigation. Different pin profiles, such as circular, square, triangular, strip and elliptic pins, and without pin HS are conducted with three different types of nanofluids-Al 2 O 3 -water, SiO 2 -water, and CuO-water for laminar forced convection. The concentrations of nanofluids vary from 0 to 5 vol% with different Reynolds numbers ranging between 100 and 1000. The finite volume method employing the SIMPLE algorithm for a computational solution is applied to solve the Navier-Stokes and energy equations. Four criterions studies are explained-energy efficiency, exergy loss, and exergy efficiency of HSs with pressure drop. The results showed that the highest energy and exergy efficiencies are nearly 76% and 57%, respectively, for elliptic-pinned HSs using pure water, while about 82% and 62% using 5 vol% of SiO 2 -water nanofluids. Besides, the elliptic-pinned HSs have a favorable reduction in the exergy loss, nearly 17% using 5 vol% of SiO 2 -water nanofluids. Subsequently, the elliptic-pinned HS is recommended to apply with pure water considering the development in pressure drop required. However, the elliptic-pinned HSs could be employed with 5 vol% of SiO 2 -water nanofluids regardless of the development in pressure drop required for thermal energy dissipation applications with more exergy efficiency and reduction of exergy loss. K E Y W O R D Sdifferent nanofluids, different pinned heat sinks, energy and exergy characteristics, exergy loss, thermal energy enhancement

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Section: Introductionmentioning

confidence: 99%

Three‐dimensional computational comparison of mini‐pinned heat sinks using different nanofluids: Part two—energy and exergy characteristics

Al‐damook

Alfellag

Khalil

2019

Heat Trans. Asian Res.

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“…Experimental results showed that the optimal pH of the Al 2 O 3 -CuO/water binary nanofluid was pH = 7.5-8.5, and the increase of the volume fraction of nanoparticles improved the extinction coefficient and absorbance spectrum of nanofluid. Zeng and Xuan [23] showed experimentally that the photo-thermal efficiency of MWCNT-SiO 2 /Ag binary nanofluid was more efficient than that of MWCNT and SiO 2 /Ag nanofluids. Besides, the photoconversion efficiency increased with temperature in all nanofluids.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Flat Plate and Vacuum Tube Solar Collectors by Applying a MWCNT/Fe3O4 Binary Nanofluid

2020

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This study experimentally investigated the performance characteristics of water and MWCNT/Fe3O4 binary nanofluid as a working fluid in a flat plate and vacuum tube solar collectors. As a result, the highest efficiency was 80.3% when 0.005 vol.% MWCNT/0.01 vol.% Fe3O4 binary nanofluid was applied to the flat plate solar collector, which was a 17.6% increase in efficiency, compared to that when water was used. In the case of the vacuum tube solar collector, the highest efficiency was 79.8%, which was 24.9% higher than when water was applied. Besides, when the mass flux of MWCNT/Fe3O4 binary nanofluid was changed from 420 to 598 kg/s·m2, the maximum efficiencies of the flat plate and vacuum tube solar collectors were increased by 7.8% and 8.3%, respectively. When the MWCNT/Fe3O4 binary nanofluid was applied to the vacuum tube solar collector, the efficiency improvement was much more significant, and the high performance could be maintained for wide operating conditions, compared with the flat plate solar collector.

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“…They found that the existence of MWCNTs in the working fluid remarkably improves energy transport of the binary nanofluid. The favorable light absorption and heat transfer performance can lead to the higher light absorption efficiency …”

Section: Introductionmentioning

confidence: 99%

Silver Nanowires Contained Nanofluids with Enhanced Optical Absorption and Thermal Transportation Properties

Zhu

Huang

Zhang

et al. 2019

Energy & Environ Materials

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Two kinds of silver nanowires (100 nm in diameter, 20 μm and 100 μm in length) are prepared. The thermo‐physical characteristics, viscosity, and photothermal conversion performance of the silver nanowires (AgNWs) contained ethylene glycol nanofluids are investigated in detail. It is found that thermal conductivity of 100 μm AgNWs contained nanofluids is higher than that of 20 μm AgNWs with the same diameters of 100 nm. Viscosity test shows that the nanofluid is a Newtonian fluid, and the longer silver nanowires, the greater viscosity. In addition, photothermal conversion efficiency of silver nanowires contained nanofluid is studied. We can observe that the 100 μm AgNWs contained nanofluid has a higher photothermal conversion efficiency than that containing 20 μm AgNWs. Moreover, we find that there is a certain correlation between heat transfer and photothermal conversion of nanofluid. It demonstrates that the high heat transfer property of nanofluid will benefit for its photothermal conversion efficiency and the mechanism is proposed. This work provides a new idea to improve photothermal conversion efficiency. We can choose materials with high thermal conductivity and strong light absorption ability to enhance the photothermal conversion performance of nanofluids.

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Enhanced solar thermal conversion and thermal conduction of MWCNT-SiO2/Ag binary nanofluids

Cited by 163 publications

References 23 publications

Three‐dimensional computational comparison of mini‐pinned heat sinks using different nanofluids: Part two—energy and exergy characteristics

Three‐dimensional computational comparison of mini‐pinned heat sinks using different nanofluids: Part two—energy and exergy characteristics

Performance Evaluation of Flat Plate and Vacuum Tube Solar Collectors by Applying a MWCNT/Fe3O4 Binary Nanofluid

Silver Nanowires Contained Nanofluids with Enhanced Optical Absorption and Thermal Transportation Properties

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