Theoretical investigation of the efficiency of a U-tube solar collector using various nanofluids

Kim, Hyeongmin; Ham, Jeonggyun; Park, Chasik; Cho, Honghyun

doi:10.1016/j.energy.2015.11.021

Cited by 110 publications

(21 citation statements)

References 35 publications

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“…Kim et al [1] applied thermal energy balance to analyze the thermal performance of a U-tube solar collector using 20% PG (propylene glycol) as the working fluid. In Chen et al [4], Kosuga et al [5], Lenert and Wang [6] and De Boni et al [7] set up test rigs to investigate the absorption of the gold or silver nanoparticles at different specialized wavelength range of 500-1000 nm.…”

Section: Introductionmentioning

confidence: 99%

Photothermal conversion characteristics of gold nanoparticles under different filter conditions

Zhang

Yang

Chen

et al. 2017

Energy

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In this article, plasmonic nanopaerticles (PNP) were used to improve the solar thermal conversion efficiency and the abortion prosperity under eight different wavelength spectrum was compared.Gold nanoparticles (GNP) is synthesized through an improved citrate-reduction method, which was used to illustrate the photo-thermal conversion of PNPs under a solar simulator with eight filters. Experimental results showed that the best light intensities at wavelength of 710 nm could reach 0.004 W/cm 2 when applied to two suns. With the increase of the irradiation time, the GNP temperature increased linearly and the temperature could be increased by 3.5 K within 300 s. In addition, there were no infrared, no visible light, and no UV filters utilized to compare GNP photothermal conversion efficiencies in three main spectrum regions. As eight filters were applied in the current experiment, more specified wavelength spectrum and longer time need to be tested for the purpose of optimisation.

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Section: Introductionmentioning

confidence: 99%

Photothermal conversion characteristics of gold nanoparticles under different filter conditions

Zhang

Yang

Chen

et al. 2017

Energy

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“…Then, some conclusions and recommendations were presented concerning the use of nanofluids. Solar collector efficiency was calculated by Kim et al and energy savings predicted for various nanofluids [1]. As a result, thermal conductivity increased as the concentration of nanofluid increased.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, many researchers have proposed methods of using a nanofluid as the working fluid in solar collectors, including flatplate solar collectors and heat exchangers [1]. It is about two decades that the term of ''Nanofluid'' has been introduced to the scientific society [2].…”

Section: Introductionmentioning

confidence: 99%

Assessment of nanoparticles in thermoeconomic improvement of shell and tube heat exchanger

Hajabdollahi

Hajabdollahi²

2016

Applied Thermal Engineering

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“…The use of carbon nanotube nanofluids not only improve the efficiency of solar collectors they also reduce the CO 2 emissions. Kim et al [13] also compared the efficiency of carbon nanotube nanofluids with Al 2 O 3 , CuO, SiO 2 and TiO 2 nanofluids. Their results indicated that the greatest efficiency was obtained at 62.8% when when carbon nanotube nanofluids are used.…”

Section: Introductionmentioning

confidence: 99%

“…Bellos et al [11] presented that the efficiency of parabolic trough collectors with sine geometry improved by 4.25% if nanofluids are used as operating fluids instead of thermal oil or pressurized water. Recently [12,13] independently used carbon nanotube nanofluids as working fluids to examine the efficiency of Utube thermal solar collectors. The use of carbon nanotube nanofluids not only improve the efficiency of solar collectors they also reduce the CO 2 emissions.…”

Section: Introductionmentioning

confidence: 99%

Mathematical model for thermal and entropy analysis of thermal solar collectors by using Maxwell nanofluids with slip conditions, thermal radiation and variable thermal conductivity

2018

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Abstract:In the present research a simplified mathematical model for the solar thermal collectors is considered in the form of non-uniform unsteady stretching surface. The non-Newtonian Maxwell nanofluid model is utilized for the working fluid along with slip and convective boundary conditions and comprehensive analysis of entropy generation in the system is also observed. The effect of thermal radiation and variable thermal conductivity are also included in the present model. The mathematical formulation is carried out through a boundary layer approach and the numerical computations are carried out for Cuwater and TiO 2 -water nanofluids. Results are presented for the velocity, temperature and entropy generation profiles, skin friction coefficient and Nusselt number. The discussion is concluded on the effect of various governing parameters on the motion, temperature variation, entropy generation, velocity gradient and the rate of heat transfer at the boundary.

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Theoretical investigation of the efficiency of a U-tube solar collector using various nanofluids

Cited by 110 publications

References 35 publications

Photothermal conversion characteristics of gold nanoparticles under different filter conditions

Photothermal conversion characteristics of gold nanoparticles under different filter conditions

Assessment of nanoparticles in thermoeconomic improvement of shell and tube heat exchanger

Mathematical model for thermal and entropy analysis of thermal solar collectors by using Maxwell nanofluids with slip conditions, thermal radiation and variable thermal conductivity

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