A review on the performance of nanoparticles suspended with refrigerants and lubricating oils in refrigeration systems

Saidur, R.; Kazi, S.N.; Hossain, M.S.; Rahman, Mizanur; Mohammed, Hussein A.

doi:10.1016/j.rser.2010.08.018

Cited by 251 publications

(96 citation statements)

References 67 publications

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“…As suggested by Weidman et al [34] , we investigate the stability of the steady flow and heat transfer solution f 0 (η) and θ 0 (η) by setting τ = 0, and hence F = F 0 (η) and G = G 0 (η) in (32) and (33) to identify initial growth or order decay of the solution (31). Thus, we have to solve the corresponding linear eigenvalue problem…”

Section: Stability Analysismentioning

confidence: 99%

Mixed convection boundary layer flow past vertical flat plate in nanofluid: case of prescribed wall heat flux

Pop

Groşan

2015

Appl. Math. Mech.-Engl. Ed.

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An analysis is carried out to investigate the steady mixed convection boundary layer flow of a water based nanofluid past a vertical semi-infinite flat plate. Using an appropriate similarity transformation, the governing partial differential equations are transformed into the coupled, nonlinear ordinary (similar) differential equations, which are then solved numerically for the Prandtl number P r = 6.2. The skin friction coefficient, the local Nusselt number, and the velocity and temperature profiles are presented graphically and discussed. Effects of the solid volume fraction φ and the mixed convection parameter λ on the fluid flow and heat transfer characteristics are thoroughly examined. Different from an assisting flow, it is found that the solutions for an opposing flow are non-unique. In order to establish which solution branch is stable and physically realizable in practice, a stability analysis is performed.

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Section: Stability Analysismentioning

confidence: 99%

Mixed convection boundary layer flow past vertical flat plate in nanofluid: case of prescribed wall heat flux

Pop

Groşan

2015

Appl. Math. Mech.-Engl. Ed.

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“…Nanoparticles are used in refrigeration systems because of their notable improvement on the thermophysical, and heat transfer capabilities of working fluid in refrigeration and air-conditioning systems in relation to an enhanced efficiency and reliability. [4] reported that nanofluids had been shown to possess the following characteristics: High specific surface area and so more heat transfer surfaces between particles and fluids, high dispersion stability with predominant Brownian motion of particles, reduced pumping power as compared to pure liquid to achieve equivalent heat transfer intensification, reduced particle clogging as compared to conventional slurries, thus promoting system miniaturization, adjustable properties, including thermal conductivity and surface wettability, by varying particle concentrations to suit different applications. A mickle of heat is released during the thermodynamic process of vapour compression refrigeration systems to its environment.…”

Section: Introductionmentioning

confidence: 99%

Energy and exergy analysis of vapour compression refrigeration system using selected eco-friendly hydrocarbon refrigerants enhanced with tio2-nanoparticle

Ajuka

Odunfa

Ohunakin

et al. 2017

IJET

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The experimental study investigated the energy and exergy performance of a domestic refrigerator using eco-friendly hydrocarbon refrigerants R600a and LPG (R290/R600a: 50%/50%) at 0, 0.05, 0.15 and 0.3wt % concentrations of 15nm particle size of TiO2 nanolubricant, and R134a. The effects of evaporator temperature on power consumption, coefficients of performance, exergetic efficiency and efficiency defects in the compressor, condenser, capillary tube and evaporator of the system were examined. The results showed that LPG + TiO2 (0.15wt %) and R600a + TiO2 (0. 15wt %) had the best of performances with an average of 27.6% and 14.3% higher coefficient of Performance, 34.6% and 35.15% lower power consumption, 13.8% and 17.53% higher exergetic efficiency, a total exergetic defect of 45.8% and 64.7% lower compared to R134a. The exergetic defects in the evaporator, compressor, condenser, and capillary tube were 38.27% and 35.5%, 49.19% and 55.56%, 29.7% and 33.7%, 39.1% and 73.8% lower in the system when compared to R134a respectively. Generally, the refrigerants with nano-lubricant mixture gave better results with an appreciable reduction in the exergy defect in the compressor than the pure refrigerants, and LPG + TiO2 (0. 15wt %) gave the best result in the refrigeration system based on energy and exergy analysis.

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“…There are two different methods of applying nanofluids in a refrigerating system, namely nanorefrigerants and nanolubricants [19][20][21]. Bi et al [22] performed an experiment on a domestic refrigerator.…”

Section: Introductionmentioning

confidence: 99%

Performance of a domestic refrigerator using nanoparticles-based polyolester oil lubricant

Haque¹,

Bakar²,

Kadirgama³

et al. 2016

J. Mech, Eng, Sci.

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The performance of a domestic refrigerator with the addition of nanoparticles in the lubricant was experimentally investigated. Different sizes of nanoparticles of Al2O3 and TiO2 were added to the polyolester (POE) oil in two different volume concentrations (0.05 and 0.1 vol.%). Energy consumption tests and freeze capacity tests were then performed on the refrigerator. The investigation results showed that the refrigerator worked normally and safely with the nanolubricants. The results of the experiments indicated that the refrigerator performed better with nanolubricants as compared to pure POE oil. The COP of the systems was increased by 19% and 22% when 0.05% and 0.1% Al2O3 nanoparticles were added to the POE oil respectively. The system with 0.1% volume concentration of Al2O3 and TiO2 nanoparticles added to the POE oil consumed 27.73% and 14.19% less energy as compared to the pure POE oil system. Hence, this study showed that the addition of nanoparticles in the lubricant oil of the refrigerator is practical and it enhanced the performance of the refrigerator

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A review on the performance of nanoparticles suspended with refrigerants and lubricating oils in refrigeration systems

Cited by 251 publications

References 67 publications

Mixed convection boundary layer flow past vertical flat plate in nanofluid: case of prescribed wall heat flux

Mixed convection boundary layer flow past vertical flat plate in nanofluid: case of prescribed wall heat flux

Energy and exergy analysis of vapour compression refrigeration system using selected eco-friendly hydrocarbon refrigerants enhanced with tio2-nanoparticle

Performance of a domestic refrigerator using nanoparticles-based polyolester oil lubricant

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