Heat transfer analysis and the effect of CuO/Water nanofluid on direct absorption concentrating solar collector

Menbari, Amir; Alemrajabi, Ali Akbar; Rezaei, Amin

doi:10.1016/j.applthermaleng.2016.05.064

Cited by 140 publications

(35 citation statements)

References 29 publications

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“…Despite the fact that there is no commercial solar collector available that uses these nanofluids, there are experimental studies that confirm its effectiveness by adding nanoparticle to improve the thermal efficiency, Natarajan et al [13] found that if the nanofluids are used as working fluids, the energy efficiency of solar water heaters increases significantly compared to conventional fluids. On the other hand, the dispersion of the nanoparticles gives an important increase in the heat transfer coefficient [14][15][16][17][18][19]. Hence, they found that it is possible to reduce the exchange surface and improve the efficiency of these devices, which confirms the results of [13].…”

Section: Introductionsupporting

confidence: 75%

Numerical study of nanofluid heat transfer SiO2 through a solar flat plate collector

Maouassi¹,

Baghidja²,

Daoud³

et al. 2017

IJHT

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This paper illustrates how practical application of nanoparticles (SiO2) as working fluid to stimulate solar flat plate collector efficiency with heat transfer modification properties. A numerical study of nanofluids laminar forced convection, permanent and stationary (SiO2), is conducted in a solar flat plate collector. The effectiveness of these nanofluids are compared to conventional working fluid (water), wherein the dynamic and thermal properties are evaluated for four volume concentrations of nanoparticles (1%, 3%, 5% and 10%), and this done for Reynolds number from 25 to 900. Results from the application of those nonfluids are obtained versus average temperature; pressure drop coefficient and Nusselt number are discussed later in this paper. Finally, we concluded that heat transfer increases with increasing both nanoparticles concentration and Reynolds number.

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Section: Introductionsupporting

confidence: 75%

Numerical study of nanofluid heat transfer SiO2 through a solar flat plate collector

Maouassi¹,

Baghidja²,

Daoud³

et al. 2017

IJHT

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“…Furthermore, the comparison between the results of the current numerical study and those of Menbari et al . are shown in Figure . The thermal efficiency is in good agreement with the experimental results for CuO/water at a flow rate of 100 L h −1 .…”

Section: Model Validationmentioning

confidence: 99%

“…Comparison between test results and simulation results in order to validate. [Color figure can be viewed at wileyonlinelibrary.com] Comparison between current numerical study and the existing experimental values[7]. [Color figure can be viewed at wileyonlinelibrary.com]…”

mentioning

confidence: 95%

Numerical investigation of efficiency enhancement in a direct absorption parabolic trough collector occupied by a porous medium and saturated by a nanofluid

Tayebi

Akbarzadeh

Valipour

2018

Env Prog and Sustain Energy

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In this study, a numerical investigation of the solar parabolic trough collector with an area of 0.856 m2 by combination of Monte Carlo Ray‐Trace (MCRT) and finite volume method (FVM) has been carried out using the FLUENT software. The purpose of this study is to investigate the effect of metal foams and nanofluids on the thermal performance of a direct absorption parabolic trough collector (DAPTC). For this purpose, three‐dimensional fully developed laminar convection heat transfer of Al2O3 and TiO2/water nanofluids is examined by 0.1, 0.2, and 0.3 vol %. Furthermore, 64 cm copper‐filled porous media in a volumetric absorbent tube are applied. The obtained results of numerical simulations are compared with the experimental data. The results demonstrate a good agreement between the numerical simulations and experimental data. The results indicate that the maximum efficiency was 34.51% for TiO2/water at 0.3 vol %. Furthermore, using porous media with high absorption coefficient and scattering coefficient that could absorb more incoming radiation and transfer to heat transfer fluid can result in increasing the efficiency of the collector. © 2018 American Institute of Chemical Engineers Environ Prog, 38: 727–740, 2019

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“…Thermal efficiency of 5‐10% point higher than a SBPTSC was achieved with a volume fraction of 0.05%. After that, the effects of different factors including operation temperature, particle volume fraction, and flow rate on the DAPTSC performance were thoroughly investigated, but all considered a transparent glass receiver containing the nanofluids. Recently, a new design was studied for a DAPTSC, where a highly reflective semicylindrical coating on the glass receiver was employed to increase the optical path length and thus reduce the required absorption coefficient of the nanofluids …”

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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Heat transfer analysis and the effect of CuO/Water nanofluid on direct absorption concentrating solar collector

Cited by 140 publications

References 29 publications

Numerical study of nanofluid heat transfer SiO2 through a solar flat plate collector

Numerical study of nanofluid heat transfer SiO2 through a solar flat plate collector

Numerical investigation of efficiency enhancement in a direct absorption parabolic trough collector occupied by a porous medium and saturated by a nanofluid

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

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