Performance characteristics of a residential-type direct absorption solar collector using MWCNT nanofluid

Delfani, Shahram; Karami, Maryam; Behabadi, Mohammad Ali Akhavan

doi:10.1016/j.renene.2015.11.004

Cited by 133 publications

(45 citation statements)

References 24 publications

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“…The application of nanofluids in low‐temperature DASCs has been the focus of various experimental and theoretical/numerical studies . A comprehensive review of the subject is found in .…”

Section: Introductionmentioning

confidence: 99%

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

Esmaeili

Karami

Delfani³

2020

Int J Energy Res

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The current research proposes the idea of using water-saturated metal oxide foams and water-based nanofluids as solar absorber in the direct absorption solar collectors (DASCs). Specifically, the novel solar collector design utilizes copper oxide (CuO) porous foam and nanoparticle with high optical properties and is expected to have enhanced thermal performance than the conventional collectors utilizing pure water. The finite volume technique is used to solve the governing equations of flow and heat transfer in the radiative participating media. Also, to establish the reliability and accuracy of numerical solutions, the obtained results are compared with the corresponding numerical and experimental data. The computations are carried out for different nanoparticle volume fractions, foam pore sizes, working fluid mass flow rates, and both porous layer thicknesses and positions (inserted at the lower or upper wall of the collector). It is found that the efficiency of DASC partially/fully filled with metal oxide foam is maximized when the collector is completely filled with it. Compared with the water flow, the numerical results show that the collector efficiency using CuO nanofluid and metal oxide foam is improved by up to 26.8% and 23.8%, respectively. Moreover, considering the second law of thermodynamics, the use of CuO nanofluids in the DASC seems to be more effective than the use of CuO porous foam. K E Y W O R D Sdirect absorption solar collector, efficiency, metal oxide foam, nanofluid, second law of thermodynamics

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“…The application of nanofluids in low‐temperature DASCs has been the focus of various experimental and theoretical/numerical studies . A comprehensive review of the subject is found in .…”

Section: Introductionmentioning

confidence: 99%

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

Esmaeili

Karami

Delfani³

2020

Int J Energy Res

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“…They demonstrated thermal efficiency of solar collector increased 18.75% at 0.05 vol %. Delfani et al [17] investigated the effect of carbon nanotubes in water and ethylene glycol mixture (70:30 vol %) on the efficiency of direct solar collector, both experimentally and numerically. They solved radiative and energy equations, simultaneously.…”

Section: Introductionmentioning

confidence: 99%

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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“…Delfani et al [22] studied the effect of the internal emissivity, the mass flow rate of the nanofluid, and the concentration of the MWCNT nanoparticles on the efficiency when an MWCNT nanofluid was used in a direct absorption solar collector. The thermal performance of the solar collector increased with the increase of the concentration and mass flow rate of the nanofluid.…”

Section: Introductionmentioning

confidence: 99%

Economic Analysis of Flat-Plate and U-Tube Solar Collectors Using an Al2O3 Nanofluid

2017

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Abstract:In this study, the efficiencies of flat-plate and U-tube solar collectors were investigated experimentally when an Al 2 O 3 nanofluid was used as a working fluid and compared to those of solar collectors using water. The energy savings and CO 2 and SO 2 generated were calculated and compared to those of solar collectors using water. In addition, based on the experimental results, an economic analysis of the use of solar collectors in various countries was performed. As the concentration of the Al 2 O 3 nanofluid increased, the performance of the solar collector improved. The highest efficiency for the solar collectors was shown at the concentration of 1.0 vol % with the nanoparticle size of 20 nm. The maximum efficiencies of the flat-plate and U-tube solar collectors using a 1.0 vol %-Al 2 O 3 nanofluid with 20-nm nanoparticles was 74.9% and 72.4%, respectively, when the heat loss parameter was zero. The efficiencies of the flat-plate and U-tube solar collectors using Al 2 O 3 nanofluid were 14.8% and 10.7% higher, respectively, than those using water. When 50 EA (each) flat-plate solar collectors were operated for one year using an Al 2 O 3 nanofluid, the coal use, generated CO 2 , and generated SO 2 were 189.99 kg, 556.69 kg, and 2.03 kg less than those of solar collectors using water, respectively. In addition, the largest electricity cost reduction was in Germany.

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Performance characteristics of a residential-type direct absorption solar collector using MWCNT nanofluid

Cited by 133 publications

References 24 publications

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

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

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

Economic Analysis of Flat-Plate and U-Tube Solar Collectors Using an Al2O3 Nanofluid

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