Thermo-physical properties of Al2O3-SiO2/PAG composite nanolubricant for refrigeration system

Zawawi, Nurul Nadia Mohd; Azmi, W.H.; Redhwan, A. A. M.; Sharif, M. Z.; Sharma, K.V.

doi:10.1016/j.ijrefrig.2017.04.024

Cited by 105 publications

(22 citation statements)

References 36 publications

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“…Fig 9(a) &10(a) shows the enhancement comparison of refrigeration effects with the addition of Si3N4 nanoparticles and Si3N4 nanoparticles/surfactant for 0.6% volume concentration. In this work theoretical and actual refrigeration effects were estimated by using the eq (1) & (2). Results found that the refrigeration effect has been enhanced by 8.1%, 8.7%, 14%, 15% and 8.7%, 9.8%, 13.15%, 14.12% for Si3N4 nanolubricant and nanolubricant with surfactant respectively corresponding to the load 1,5,10 and 15 liters in comparison with pure oil.…”

Section: Measurement Of Electrical Conductivity Of Nanolubricantmentioning

confidence: 94%

“…conc. and temperature of 303 K with the addition of composite nanoparticles (Al2O3-SiO2/PAG oil) to the compressor lubricant oil [2].…”

Section: Introductionmentioning

confidence: 99%

“…Experimentation concludes that the maximum dynamic viscosity enhanced with the inclusion of composite nanoparticles (Al2O3-SiO2/PAG oil) to the compressor lubricant oil by 9.71% at 0.1% vol. concentration and temperature of 333 K [2].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance Reseach On Water Cooler With Silicon Nitride/Polyolester Nanolubricant

Ahamed¹,

Basha²,

Prasad³

et al. 2019

IJEAT

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Performance of vapour compression refrigeration depends on refrigeration effect and power utilization of the compressor. The present work focuses on reduction in power utilization of the compressor and enhancement in refrigeration effect with the supplement of silicon nitride (Si3N4) nanoparticles (NP) to the compressor lubricant polyolester (POE) oil. Also the performance of the water cooler has been compared with the addition of tetra butyl ammonia iodide (TBAI) surfactant to the nanolubricant. Thermophysical properties of the modified POE and POE/Si3N4NP/surfactant were found before experimentation to select the optimum concentration for the performance evaluation. Test results showed that the maximum thermal conductivity was improved by 31.06% for nanolubricant and 30.5% for nanolubricant with surfactant at 0.6% vol concentration. It is also seen that the viscosity has been enhanced maximum at 0.6% vol. concentration and for the same concentration the friction coefficient has been reduced by 7% and 11% for nanolubricant and nanolubricant with surfactant. Further the performance was evaluated with nanolubricant and nanolubricant/surfactant and the results were compared. It is found that the coefficient of performance (COP) has been enhanced by 36.39% and 29.6% for nanolubricant and nanolubricant/surfactant. Also the performance of the water cooler was investigated after 30 days and the results were in accordance with the initial results. Hence the experimentation shows that the addition of Si3N4 nanoadditives to the POE oil enhances the working of the water cooler.

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Section: Measurement Of Electrical Conductivity Of Nanolubricantmentioning

confidence: 94%

“…conc. and temperature of 303 K with the addition of composite nanoparticles (Al2O3-SiO2/PAG oil) to the compressor lubricant oil [2].…”

Section: Introductionmentioning

confidence: 99%

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Performance Reseach On Water Cooler With Silicon Nitride/Polyolester Nanolubricant

Ahamed¹,

Basha²,

Prasad³

et al. 2019

IJEAT

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“…The spectral absorbance was then used to correlate the nanoparticles concentration by employing Beer-Lambert's law to develop a linear correlation between colloidal suspension concentration and absorbance intensity as shown in Eq. (1) [38].…”

Section: Experimental Strategymentioning

confidence: 99%

Experimental Investigation on Preparation and Stability of Al2O3 Nanofluid In Deionized Water and Ethylene Glycol

Safiei

Rahman

Hadi

et al. 2020

ARFMTS

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Nanofluid has the potential as a cooling medium for the next generation fluid as it possesses many advantages in many engineering applications. However, one of the main challenges is to establish a well-dispersed nanoparticles system in a base fluid. The preparation technique of nanofluid plays an important part as it influences the measurement of thermal conductivity. Therefore, the objectives of this study are to evaluate the nanoparticle dispersion in different base fluid compositions and to determine the optimized suspension sonication time. In detail, 0.2 wt.% of Al2O3 nanofluid stability in the three ratios of base fluid (deionized water:ethylene glycol) 80:20, 70:30 and 60:40 were studied. The studies were based on a visual inspection and spectral absorbance analysis. It has clearly shown that the nanofluids prepared in 60:40 base fluid within 3 hours sonication time was the most stable suspension compared to other nanofluids. The visual inspection indicated nanofluid condition remains stable after 30 days. The spectral absorbance of nanofluids was recorded at 100 % for 5 days after preparation and remains above 95 % compared to the initial value, reflecting stable suspension. Hence the novelty of this work lies in the nanofluid stability based on sonication time and base fluid compositions.

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“…The COP using both R436A/POE and R436B/POE was found higher compared to R134a/lubricant (POE). Mahbubul et al [15] analysed the thermo-physical characteristic and their effects on COP due to mixing of 5 vol.% of Al 2 O 3 nanoparticles in R134a. They concluded an increase in the thermal conductivity, dynamic viscosity, and density of nanorefrigerant (R134a/ Al 2 O 3 ) by 28.58%, 13.68%, and 11%, respectively, compared to R134a at the same temperature.…”

Section: Introductionmentioning

confidence: 99%

Performance investigation of ice plant working with R134a and different concentrations of POE/TiO2 nanolubricant using experimental method

Chauhan

Kumar

Rajput

2019

J Braz. Soc. Mech. Sci. Eng.

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This paper experimentally investigates the performance of an ice plant test rig for varied volume concentrations (0.1%, 0.2% and 0.3%) of TiO 2 nanoparticles dispersed in polyol ester (POE) lubricating oil using R134a as a working refrigerant. The performance of the test rig is investigated on the basis of parameters including brine temperature in the brine tank (pulldown time), pressure ratio, compressor power input, freezing capacity, COP, thermal conductivity, viscosity, and density at suction and discharge end of compressor. Analysis is based on temperature and pressure readings taken using suitable thermocouples and gauges fitted to the test rig. Refrigerant properties are acquired using REFPROP 9.1 software development by NIST. The concentration of 0.2% is found as the optimum since the lowest compressor power input and the highest COP are achieved at this concentration. The result indicates that the mixture of R134a/nanolubricant (POE/TiO 2) worked safely and efficiently in the rig, and the performance is found better than operated with mixture of R134a/lubricant (POE), with 15.8% less power consumption in the compressor and 29.1% increase in the COP at 0.2% volume concentration of TiO 2 nanoparticles. Moreover, thermal conductivity, viscosity, and density of the mixture of R134a/nanolubricant (POE/TiO 2) are found higher compared to mixture of R134a/lubricant (POE) and are increasing with increasing the TiO 2 concentration.

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Thermo-physical properties of Al2O3-SiO2/PAG composite nanolubricant for refrigeration system

Cited by 105 publications

References 36 publications

Performance Reseach On Water Cooler With Silicon Nitride/Polyolester Nanolubricant

Performance Reseach On Water Cooler With Silicon Nitride/Polyolester Nanolubricant

Experimental Investigation on Preparation and Stability of Al2O3 Nanofluid In Deionized Water and Ethylene Glycol

Performance investigation of ice plant working with R134a and different concentrations of POE/TiO2 nanolubricant using experimental method

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