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

Esmaeili, Mohammad; Karami, Maryam; Delfani, Shahram

doi:10.1002/er.5305

Cited by 28 publications

(10 citation statements)

References 77 publications

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“…In nanofluids, the suspended nanoparticles can boost the absorption coefficient of base fluids if the absorption performance of nanoparticles is substantially higher than that of the base fluid. Water‐based nanofluids have been widely investigated until recently using various nanoparticles, such as metal nanoparticles (eg, gold nanorod 5 and Fe 6 ), metal oxide nanoparticles (eg, WO 3 , 7 Al 2 O 3, 8 and Cu oxide porous foam 9 ), carbon nanoparticles (eg, MWCNT 10 ), hybrid (CuO/MWCNT 11 and Fe 3 O 4 /carbon nanoparticles 12 ), and core‐shell (silica‐gold 13,14 ) nanoparticles. For example, water‐based plasmonic nanofluids were synthesized with three types of nanorods that have different aspect ratios for broadband absorption 5 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of therminol‐graphite nanofluids and photo‐thermal conversion properties

et al. 2021

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Summary Therminol‐based nanofluids with graphite nanopowders (GNs) were proposed as an efficient working fluid in direct‐absorption solar collectors (DASCs), especially for elevated‐temperature applications. In this work, Therminol VP‐1/GN nanofluids (TG nanofluids) were prepared in two steps with surfactant (Triton X‐100). In the synthesis procedure, the vortex generator for coating GN with sticky surfactant (μ = 240 mPa⋅s) and the ultra‐sonicator for diluting GN/Triton X‐100 mixture with Therminol VP‐1 are used. We have demonstrated excellent dispersion stability up to 4 weeks and even after heating over 100°C without any surface modification of nanoparticles. The feasibility of using the synthesized TG nanofluid as a working fluid in DASCs was experimentally demonstrated by measuring its absorption coefficient as well as by characterizing photo‐thermal conversion performance. The absorption coefficient of the TG nanofluid at 0.004 wt.% of GNs was measured to be 1.12 cm−1, which is more than eight times enhanced from that of bare Therminol VP‐1 (ie, 0.13 cm−1) in the wavelengths from 350 to 1600 nm. Finally, the temperature increment of 43°C was achieved after t = 3600 s under the 5‐sun condition in the static photo‐thermal conversion experiment. Moreover, the low viscosity of TG nanofluids (only 2.2% higher than that of the bare Therminol VP‐1) supports the superiority of TG nanofluids to be applied as working fluid in DASCs.

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Section: Introductionmentioning

confidence: 99%

Synthesis of therminol‐graphite nanofluids and photo‐thermal conversion properties

et al. 2021

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“…Therefore, nanofluids are promising alternatives to the commonly used fluids in DASCs. 11,12 Various nanoparticles, ranging from carbon materials (such as graphene, 13,14 carbon black, 15 carbon nanotube, 16,17 and graphite 18 ), metals (such as Cu, 19 Ag, 20 and Au 21 ), metal oxides (such as Fe 3 O 4, 22 CuO, 23,24 and TiO 2 25 ), carbides (such as SiC 26 and ZrC 27 ), and nitrides (such as BN 28 and TiN 29 ), have been evaluated for light absorption enhancement. However, a mono nanoparticle can usually improve the absorption in a certain bandwidth of the solar spectrum, leading to limited performance enhancement.…”

Section: Introductionmentioning

confidence: 99%

Photo‐thermal conversion performance of mono MWCNT and hybrid MWCNT‐TiN nanofluids in direct absorption solar collectors

Zheng

Yan

Long

et al. 2022

Intl J of Energy Research

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Summary Solar energy is being widely investigated due to its abundant, renewable, and clean features. Photo‐thermal conversion in solar collectors is a direct approach for harvesting solar energy. Compared to the commonly used surface‐based solar collectors (SSCs), nanofluid‐based direct absorption solar collectors (DASCs) are more efficient. In this work, water‐based mono MWCNT and hybrid MWCNT‐TiN nanofluids were prepared through a two‐step method, aiming at light absorption enhancement of nanofluids for applications in DASCs. The optical and photo‐thermal conversion performance of the MWCNT nanofluids was firstly evaluated. The results showed that the MWCNT nanofluids presented high solar absorption capability, and the highest photo‐thermal conversion efficiency was obtained at 10 ppm. The TiN nanoparticles were subsequently incorporated to form the hybrid MWCNT‐TiN nanofluids. The absorption performance of the hybrid nanofluids was further enhanced. The highest efficiency of the hybrid MWCNT‐TiN nanofluids was achieved at the TiN mass fraction of 10 ppm, which was about 6.9%, 6.0%, and 3.8% higher than that of the MWCNT nanofluid at 2000, 4000, and 6000 seconds due to the localized surface plasmon resonance (LSPR) effect of TiN nanoparticles. It was also found that the collector efficiency dropped rapidly with the prolonged irradiation time owing to the convection and radiation heat loss at the elevated temperature. Therefore, effective measures should also be taken to reduce heat loss to maintain high photo‐thermal conversion efficiency.

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“…20 Eltaweel et al 21 selected 0.25 wt% multiwalled carbon nanotube/water nanofluid as the heat transfer medium of the solar collector, and found that the heat transfer efficiency was 7% higher than that of pure water. Esmaeili et al 22 compared the effects of different heat transfer medium on the performance of solar collectors. Compared with water, they concluded that the thermal efficiency of using CuO nanofluids and metal oxide foam as heat transfer medium increased by 26.8% and 23.8%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Thermal performances evaluation of a flat‐plate solar collector using microencapsulated phase‐change slurry as heat transfer medium

Ran

Zhang

et al. 2022

Intl J of Energy Research

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Microencapsulated phase-change slurry (MPCS) is composed of microencapsulation phase-change materials (MPCM) and carrying medium (water), which can be used for heat transfer and thermal energy storage. Some theoretical and experimental works have been proposed on the thermal energy storage and flow performance of MPCS. However, there are few studies on the performances of MPCS in the thermal energy devices (eg, solar collector). In present work, the numerical model of a flat-plate solar collector with MPCS as the thermal energy storage fluid was established. Then, the effects of mass fraction of MPCS, latent heat and solar radiation on thermal efficiency, and pumping power consumption of the solar collector model were studied. The simulations indicated that the thermal efficiency of the solar collector model was positively correlated with the mass fraction and latent heat, but decreased with the increase of solar radiation. When the inlet flow rate, mass concentration, latent heat and solar radiation of the MPCS were set to 0.01 m/s, 5.90%, 88 kJ/kg and 300 W/m 2 , respectively, thermal efficiency of the solar collector model was the largest, which was 0.711. Moreover, the pumping power consumption was mainly affected by inlet flow rate and mass fraction of MPCS.

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

Cited by 28 publications

References 77 publications

Synthesis of therminol‐graphite nanofluids and photo‐thermal conversion properties

Synthesis of therminol‐graphite nanofluids and photo‐thermal conversion properties

Photo‐thermal conversion performance of mono MWCNT and hybrid MWCNT‐TiN nanofluids in direct absorption solar collectors

Thermal performances evaluation of a flat‐plate solar collector using microencapsulated phase‐change slurry as heat transfer medium

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