A review on optical properties and application of nanofluids in direct absorption solar collectors (DASCs)

Gorji, Tahereh B.; Ranjbar, A.A.

doi:10.1016/j.rser.2017.01.015

Cited by 259 publications

(78 citation statements)

References 114 publications

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“…In a DASC, the nanoparticles dispersed in the nanofluids directly interact and absorb the solar energy; thus, the absorber coating is no longer needed. More importantly, due to the volumetric characteristics of solar energy absorption by the well dispersed nanoparticles, the temperature distribution in the receiver is relatively uniform and the resulting surface temperature can be lower, which in turn reduces the heat loss to the environment (ie, leading to an improved thermal efficiency) . In the pioneering DASC work, the nanofluid with aluminum nanoparticles dispersed in water was applied, and the DASC at the particle concentration of 0.8% was shown obtaining a higher thermal efficiency in comparison with a surface‐based solar collector by 10% point when the operating conditions are kept the same.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of direct‐absorption parabolic‐trough solar collectors considering concentric nanofluid segmentation

et al. 2020

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Summary Nanofluids have been actively used in direct‐absorption solar collectors. In a direct‐absorption parabolic‐trough solar collector (DAPTSC) for medium‐high temperature regime, the nanofluids used to be contained in a transparent glass receiver located at the focal line of a parabolic mirror so that the solar radiation is concentrated to the glass receiver and absorbed volumetrically inside the collector. In order to further increase the thermal efficiency of a DAPTSC, we propose to insert an extra glass tube inside the nanofluid so that the nanofluid is separated into two concentric segmentations (ie, an inner section and an outer section), and apply a nanofluid of lower concentration in the outer section while a nanofluid of a higher concentration in the inner section. The proposed idea is numerically tested on four pairs of DAPTSCs (the variants obtained depending on whether there is a vacuum envelope and whether there is a reflective semicylindrical coating on the receiver). The results show that at the same particle concentration parameter, the DAPTSCs with two concentric segmentations of nanofluids outperform those with one uniform nanofluid for all configurations considered in this work. For a transparent case without an envelope, this efficiency increase is as high as 12.5% point when the inlet temperature is 350 K. In addition, parametric studies are performed for this best configuration to evaluate the effect of absorption coefficient, mass flow rate, collector length, solar irradiance, and convection heat transfer coefficient on the collector performance.

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Section: Introductionmentioning

confidence: 99%

Comparative analysis of direct‐absorption parabolic‐trough solar collectors considering concentric nanofluid segmentation

et al. 2020

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“…In recent years, the solar radiation absorption and heating of nanoparticles (NPs) and nanofluids containing NPs, including the steam nanobubbles formation, became an important area of photothermal solar energy conversion [1][2][3][4][5][6][7][8][9][10][11][12]. These phenomena are used in application of NPs and nanofluids in solar energy harvesting, radiation chemistry and catalysis, the use of steam in autoclaves, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Metallic NPs are of special interest for photothermal (PT) and solar energy applications because of their prominent plasmonic and thermo-optical properties [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Also metal oxide core-shell NPs are very interesting due to their solar energy absorption.…”

Section: Introductionmentioning

confidence: 99%

“…They are heat exchangers that are used to absorb and transform solar radiation energy to thermal energy of the transport liquid. It is proposed to directly absorb the solar energy within the fluid volume and to sharply enhance the efficiency of collectors-the so-called direct absorption solar collector (DASC) [6][7][8][9]. DASCs have been used for a variety of applications such as water and air heating.…”

Section: Introductionmentioning

confidence: 99%

“…The results of this article can be used for the solution of this task. The selection of appropriate NPs and nanofluids for the improvement and manipulation of the NP plasmon resonances is very important for solar energy absorption and harvesting [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. On the other side, a comparative analysis of optimal parameters of various metallic and metal-its oxide core-shell NPs for using them as PT agents in solar nanotechnology is still missing.…”

Section: Introductionmentioning

confidence: 99%

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Light-absorption selection of nanoparticles and nanofluids containing nanoparticles for their effective heating by solar radiation

Pustovalov

Astafyeva

Fritzsche

2017

Nanotechnol. Environ. Eng.

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Light-absorption selection of single nanoparticle for solar radiation requires the simultaneous fulfillment of all of the following novel conditions-maximal close (overlap) of the dependence of nanoparticle efficiency absorption factor on wavelength with the dependence solar irradiance, predominant role of nanoparticle absorption over its scattering, the use of maximal values of nanoparticle efficiency absorption factor and its size. These results highlight the possibility for effective application of single homogeneous Ti and core-shell Ti-TiO 2 , Ni-NiO nanoparticles with radii of about 75 nm as perfect absorbers for solar radiation in the complete optical spectrum 250-2500 nm. Light-absorption conditions for nanofluids include dominant radiation absorption by presented nanoparticles with selected properties and concentrations of about 1 9 10 9 , 1 9 10 10 cm -3 under the solar absorption by water in the spectral interval of 250-1000 nm, which includes * 70% of whole solar energy. Presented results can be applied for applications in the development of novel working nanofluids for direct absorption solar collectors. These conditions can be used for the selection of various nanoparticles from different materials and structures for other optical radiation sources.

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Nanofluids in Linear Fresnel Reflector

Bellos

Said

Tzivanidis

2023

Nanotechnology Applications for Solar Energy Systems

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A review on optical properties and application of nanofluids in direct absorption solar collectors (DASCs)

Cited by 259 publications

References 114 publications

Comparative analysis of direct‐absorption parabolic‐trough solar collectors considering concentric nanofluid segmentation

Comparative analysis of direct‐absorption parabolic‐trough solar collectors considering concentric nanofluid segmentation

Light-absorption selection of nanoparticles and nanofluids containing nanoparticles for their effective heating by solar radiation

Nanofluids in Linear Fresnel Reflector

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