Highly-efficient nanofluid-based direct absorption solar collector enhanced by reverse-irradiation for medium temperature applications

Wang, Kongxiang; He, Yan; Liu, Pengyu; Kan, Ankang; Zheng, Zhiheng; Wang, Lingling; Xie, Huaqing; Yu, Wei

doi:10.1016/j.renene.2020.05.167

Cited by 30 publications

(11 citation statements)

References 39 publications

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“…The collector efficiency is given as, 29

η goodbreak= \frac{{mc}_{P} ((), T_{bulk} goodbreak- T_{initial})}{GAΔt} goodbreak= \frac{italichρ c_{P} ((), T_{bulk} goodbreak- T_{initial})}{GΔt}

where m ,

ρ

and

c_{P}

refer to the nanofluid's mass weight, density, and specific heat capacity. In Equation (), A is the top illumination area of the collector and

h

is the height of the nanofluid;

T_{bulk}

is the bulk temperature of the nanofluid, which is determined as the arithmetic mean temperature at different fluid depths, and

T_{initial}

denotes the initial temperature;

G

and

italicΔt

represent the flux of the solar irradiation and irradiation time, respectively.…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…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%

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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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“…The collector efficiency is given as, 29

η goodbreak= \frac{{mc}_{P} ((), T_{bulk} goodbreak- T_{initial})}{GAΔt} goodbreak= \frac{italichρ c_{P} ((), T_{bulk} goodbreak- T_{initial})}{GΔt}

where m ,

ρ

and

c_{P}

refer to the nanofluid's mass weight, density, and specific heat capacity. In Equation (), A is the top illumination area of the collector and

h

is the height of the nanofluid;

T_{bulk}

is the bulk temperature of the nanofluid, which is determined as the arithmetic mean temperature at different fluid depths, and

T_{initial}

denotes the initial temperature;

G

and

italicΔt

represent the flux of the solar irradiation and irradiation time, respectively.…”

Section: Mathematical Modelingmentioning

confidence: 99%

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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show abstract

“…In order to realize efficient solar thermal energy conversion platforms based on volumetric absorption principle, a detailed investigation into transport mechanisms involved in such systems is warranted. In this direction, to decipher the fundamental performance limits, researchers across the globe have modeled nanofluid based volumetric absorption receivers as nanofluid filled enclosures irradiated from top [3,4,8,9,[14][15][16][17][18][19]. Figure 1 presents a list of selected works pertinent to the analysis of heat transfer mechanisms involved in nanofluid filled enclosures.…”

Section: Introductionmentioning

confidence: 99%

Nanofluid Filled Enclosures: Potential Photo-Thermal Energy Conversion and Sensible Heat Storage Devices

2022

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“…Nanofluids show excellent thermal conductivity 1,2 and they are used in many fields. Such as, CPU cooling, 3,4 heat exchangers, 5‐7 heat pipe, 8 microchannel, 9,10 solar evaporation, 11 and photothermal conversion 12‐14 . Esfe et al 15 reviewed the application of nanofluids in machining processes.…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann simulation on thermal management of electronic components with nonuniform temperature based on nanofluids

Ding

et al. 2021

Int J Energy Res

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Summary In order to conduct thermal management of electronic components with nonuniform temperature, the flow and heat transfer characteristics of nanofluids in four kinds of cavities with inclined nonuniform heating surfaces were simulated by the lattice Boltzmann model. Classified from the two‐dimensional geometry, the influence of parallelogram cavity, inverted parallelogram cavity, trapezoid cavity, and inverted trapezoid cavity was researched. Considering the complex thermal environment in reality, effects of four kinds of heating wall boundary conditions (constant temperature, gradient temperature, piecewise temperature, and normal temperature) are discussed. Results showed that the flow velocity of nanofluid in the inverted trapezoid cavity is the highest. The highest average Nusselt number near the heating wall of the inverted parallelogram cavity can reach 3.97. Among all kinds of wall heating conditions, cavities with constant temperature have the best heat transfer effect, whose Nu number is 33.4% higher than that of cavities with piecewise temperature in average. The average total entropy change of inverted parallelogram cavity is 16.83. According to the simulation results, the best arrangement of natural convection cooling can be determined.

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Highly-efficient nanofluid-based direct absorption solar collector enhanced by reverse-irradiation for medium temperature applications

Cited by 30 publications

References 39 publications

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

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

Nanofluid Filled Enclosures: Potential Photo-Thermal Energy Conversion and Sensible Heat Storage Devices

Lattice Boltzmann simulation on thermal management of electronic components with nonuniform temperature based on nanofluids

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