Highly efficient energy harvest via external rotating magnetic field for oil based nanofluid direct absorption solar collector

Wang, Debing; Liang, Wenwen; Zheng, Zhiheng; Jia, Peiyu; Yan, Yunrui; Xie, Huaqing; Wang, Lingling; Yu, Wei

doi:10.1016/j.gee.2020.03.014

Cited by 20 publications

(8 citation statements)

References 36 publications

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“…To estimate the photothermal conversion efficiency η for the three nanofluids, the following formula [ 45,46 ] was used.

η = \frac{false(T_{eq} - T_{am} false) m_{normalw} C_{normalw} B}{A S_{normalm}}

where T eq and T am are the equilibrium temperature and initial temperature of nanofluids, respectively. m w is the mass of the nanofluids (3.5 g), C w is 2.74 × 10 3 J kg −1 K −1 (the specific heat of heat transfer oil), the constant B is obtained by a linear fit of ln[( T ( t ) −T am ) /( T eq −T am )] versus time t , during the cooling phase, A is the upper surface area of the cuvette (4 cm 2 ), and S m is the heat flux of incident light (2000 W m −2 ).…”

Section: Resultsmentioning

confidence: 99%

“…This is due to the excessive concentration of nanocomposites that concentrate the absorption of thermal energy in the upper layer of the nanofluids, similar to the surface absorber of a collector. [44] To estimate the photothermal conversion efficiency η for the three nanofluids, the following formula [45,46] was used.…”

Section: Photothermal Conversion Efficiencymentioning

confidence: 99%

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Photothermal Conversion Characteristics of ZnO/MWCNTs Binary Nanofluids and ZnO/MWCNTs/Au Ternary Hybrid Nanofluids in Direct Absorption Solar Collectors

Dong

Ding

et al. 2022

Energy Tech

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Herein, the oil‐based ZnO/multiwalled carbon nanotubes (MWCNTs) binary nanofluids and ZnO/MWCNTs/Au ternary hybrid nanofluids are proposed. The effects of nanoparticles concentration, and the ratio of ZnO and MWCNTs on the optical properties and photothermal conversion performance are experimentally analyzed. Compared to the base fluid (heat transfer oil), the transmittance of the nanofluids decreases with increasing nanoparticle concentration. The ZnO/MWCNTs nanofluids show slightly higher optical absorption performance than MWCNTs due to the multiple scattering caused by the ZnO hierarchical structure. The ZnO/MWCNTs nanocomposites decorate with gold nanoparticles (Au NPs) to form ZnO/MWCNTs/Au ternary hybrid nanofluids. The ZnO/MWCNTs/Au nanofluids have slightly higher absorption performance in the visible region due to the plasmonic effect exhibited of the Au NPs. The photothermal results show that the maximum value of photothermal conversion efficiency (91.2%) of ZnO/MWCNTs nanofluids is achieved when maintaining the solid content of MWCNTs at 0.01 wt% and the ZnO and MWCNTs ratio of 2:3. The photothermal conversion efficiencies of MWCNTs and ZnO/MWCNTs/Au nanofluids are enhanced by about 35.6% and 42.8%, respectively. This work demonstrates that ZnO/MWCNTs and ZnO/MWCNTs/Au nanofluids have potential application as working fluids for direct absorption solar collectors.

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“…To estimate the photothermal conversion efficiency η for the three nanofluids, the following formula [ 45,46 ] was used.

η = \frac{false(T_{eq} - T_{am} false) m_{normalw} C_{normalw} B}{A S_{normalm}}

Section: Resultsmentioning

confidence: 99%

Section: Photothermal Conversion Efficiencymentioning

confidence: 99%

Photothermal Conversion Characteristics of ZnO/MWCNTs Binary Nanofluids and ZnO/MWCNTs/Au Ternary Hybrid Nanofluids in Direct Absorption Solar Collectors

Dong

Ding

et al. 2022

Energy Tech

Self Cite

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“…However, the coating will degrade during the solar absorbing process, causing damage to the environment . Recently, the nanofluid-based direct absorption solar collector (DASC) has been considered to be an important alternative method to improve the efficiency of solar thermal utilization. − Its heat collecting fluid is not only the working medium for absorbing and converting solar energy but also has the heat transfer function, reducing the heat loss and increasing the rational use of heat energy. The scientists focus on maximizing the conversion of light energy into heat energy in the DASC.…”

Section: Introductionmentioning

confidence: 99%

Electrostatically Assisted Construction Modified MXene-IL-Based Nanofluids for Photothermal Conversion

Xie

et al. 2023

ACS Appl. Mater. Interfaces

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Solar energy, as renewable energy, has paid extensive attention for solar thermal utilization due to its unique characteristics such as rich resources, easy access, clean, and pollution-free. Among them, solar thermal utilization is the most extensive one. Nanofluid-based direct absorption solar collectors (DASCs), as an important alternative method, can further improve the solar thermal efficiency. Notably, the stability of photothermal conversion materials and flowing media is critical to the performance of DASC. Herein, we first proposed novel Ti3C2T x -IL-based nanofluids by the electrostatic interaction, which consists of functional Ti3C2T x modified with PDA and PEI as a photothermal conversion material and ionic liquid with low viscosity as the flow medium. Ti3C2T x -IL-based nanofluids exhibit excellent cycle stability, wide spectrum, and efficient solar energy absorption performance. Besides, Ti3C2T x -IL-based nanofluids maintain liquid state in a range of −80 to 200 °C, and its viscosity was as low as 0.3 Pa·s at 0 °C. Moreover, the equilibrium temperature of Ti3C2T x @PDA-IL at a very low mass fraction of 0.04% reached 73.9 °C under 1 Sun, indicating an excellent photothermal conversion performance. Furthermore, the application of nanofluids in photosensitive inks has been preliminarily explored, which is expected to play a role in the fields of injectable biomedical materials and photo/electric double-generation thermal and hydrophobic anti ice coatings.

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“…At present, the application of nanofluids in a direct absorption solar collector (DASC) can significantly enhance the heat transfer and solar energy absorption capacity and greatly improve the performance of DASC [ 21 , 22 , 23 ]. Researchers have invested in a lot of studies on the application of nanofluids in solar collectors [ 24 , 25 , 26 , 27 , 28 ]. Due to the interaction between light and nanoparticles, local surface plasmon resonance (LSPR) [ 29 ] can be excited in nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Optical Properties of Plasma Dimer Nanoparticles for Solar Energy Absorption

Sun

Qin

Zhai³

et al. 2021

Nanomaterials

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Plasmonic nanofluids have excellent optical properties in solar energy absorption and have been widely studied in solar thermal conversion technology. The absorption of the visible region of solar energy by ordinary metal nanoparticles is usually limited to a narrow resonance band, so it is necessary to enhance the coupling effect of nanoparticles in the visible spectrum region to improve absorption efficiency. However, it is still a difficult task to improve solar energy absorption by adjusting the structure and performance of nanoparticles. In this paper, a plasma dimer Ag nanoparticle is proposed to excite localized surface plasmon resonance (LSPR). Compared with an ordinary Ag nanoparticle in the visible region, the plasmonic Ag dimer nanoparticle produces more absorption peaks and broader absorption bands, which can broaden solar energy absorption. By analyzing the electromagnetic field of the nanoparticle, the resonance mode of the plasma dimer is discussed. The effects of the geometric dimensions of the nanoparticle and the embedding of two spheres on the optical properties are studied. In addition, the effects of a trimer and its special structure on the optical properties are also analyzed. The results show that the proposed plasma dimer Ag nanoparticle has broad prospects for application in solar thermal conversion technology.

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Highly efficient energy harvest via external rotating magnetic field for oil based nanofluid direct absorption solar collector

Cited by 20 publications

References 36 publications

Photothermal Conversion Characteristics of ZnO/MWCNTs Binary Nanofluids and ZnO/MWCNTs/Au Ternary Hybrid Nanofluids in Direct Absorption Solar Collectors

Photothermal Conversion Characteristics of ZnO/MWCNTs Binary Nanofluids and ZnO/MWCNTs/Au Ternary Hybrid Nanofluids in Direct Absorption Solar Collectors

Electrostatically Assisted Construction Modified MXene-IL-Based Nanofluids for Photothermal Conversion

Optical Properties of Plasma Dimer Nanoparticles for Solar Energy Absorption

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