Experimental investigation of TiO2-, SiO2- and Al2O3-lubricants for a domestic refrigerator system using LPG as working fluid

Ohunakin, Olayinka S.; Adelekan, Damola S.; Babarinde, T. O.; Leramo, R.O.; Abam, Fidelis I.; Diarra, Charles D.

doi:10.1016/j.applthermaleng.2017.08.153

Cited by 68 publications

(21 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, the uncertainties of the measured parameters were estimated using methodology of measurement uncertainties in Schultz and Cole (1979). Methods described in Schultz and Cole method [30] and Ohunakin et al [31] defined uncertainty of the desired parameter like U F using Eq. 4:…”

Section: Uncertainty Of Measured Parametersmentioning

confidence: 99%

Performance of a domestic refrigerator in varying ambient temperatures, concentrations of TiO2 nanolubricants and R600a refrigerant charges

Adelekan

Ohunakin

Oladeinde

et al. 2021

Heliyon

View full text Add to dashboard Cite

This study investigates the effect of varying test conditions including ambient temperature (19, 22, and 25 C), mass charges of R600a refrigerant (40, 50, 60, and 70 g), and concentrations of TiO 2 nanolubricant (0, 0.2 and 0.4 g/L) on the performance of a slightly modified 100g R134a domestic refrigeration system. The investigated parameters include evaporator air temperature, energy consumption, coefficient of performance, and second law efficiency of the system. The results showed that the performance of the refrigeration system at 0.2 and 0.4 g/L concentrations of TiO 2 nanolubricant, improved at optimum ambient temperature and R600a mass charge conditions. At optimum conditions, the evaporator air temperature and energy consumption reduced within the range 5.26 to 26.32 %, and 0.13 to 14.09 % respectively, while the coefficient of performance and second law efficiency increased within the range 0.05 to 16.32 %, and 2.8 to 16 %, respectively. However, at other conditions (nonoptimum), the energy consumption and evaporator air temperature were higher and within the range 0.28 to 8.26 %, and 5 to 40 % respectively, while the coefficient of performance and second law efficiency reduced within the range 2.99 to 10.94 %, and 0.55 to 13.43 % respectively. In conclusion, we observed variations in the performance of the refrigerator with varying test conditions.

show abstract

Section: Uncertainty Of Measured Parametersmentioning

confidence: 99%

Performance of a domestic refrigerator in varying ambient temperatures, concentrations of TiO2 nanolubricants and R600a refrigerant charges

Adelekan

Ohunakin

Oladeinde

et al. 2021

Heliyon

View full text Add to dashboard Cite

show abstract

“…Thus, by adding nanoparticle to the lubricant improves its thermophysical properties, heat transfer rates, and by which enhances the effectiveness of the system. Performance improvement of the refrigeration system by adopting nanolubricants is also reported in certain research works 22–25 . It is also reported that the pool boiling characteristics of the nanolubricant/nanorefrigerant mixture is prominently affected by the fluid viscosity 26,27 .…”

Section: Introductionmentioning

confidence: 73%

“…SiO 2 nanoparticles were selected for this study as they are less toxic, chemically safe and stable, and cheaper when compared with other oxide nanoparticles of the same shape and size. Also, it has excellent biocompatibility, high‐temperature resistance, and better tribological properties 22–25 . SiO 2 nanoparticles, procured from Sigma‐Aldrich Ltd, USA, with purity 99.5%, with a normal size of 5–20 nm (Transmission electron microscopy, TEM) was taken to synthesize the nanolubricant.…”

Section: Methodsmentioning

confidence: 99%

The effect of silica nanoparticle on thermal, chemical, corrosive, and the nature‐friendly properties of refrigerant compressor lubricants—A comparative study

Narayanasarma

Kuzhiveli

2020

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

Polyolester (POE) oil and mineral (Min) oil are widely used in household refrigerators as compressors lubricants in India. An experimental calculation on the thermal, chemical, corrosion, and nature-friendly properties of POE oil and Min oil suspended with silica nanoparticles is conducted for confirming its practicality to adopt in refrigeration compressors as nanolubricant. No surfactants were used for synthesizing the nanolubricants. The mass fractions from 0.01% to 0.2% and temperatures from 25 C to 85 C are considered. The thermal conductivity and fire point increased as SiO 2 mass proportions increased. The pour and cloud points decreased, and in the corrosive nature, apparently little effect was observed by adding SiO 2 nanoparticles. The total acid number (TAN) and saponification number increased with the increase in SiO 2 nanoparticle concentration. All the synthesized nanolubricants were biodegradable and a little toxic. Refrigerant compressors with long life, with smooth and safe working are expected using POE oil and Min oil with up to 0.2% SiO 2 (without surfactants) because of augmented thermal properties and less influenced corrosive, chemical, and eco-friendly properties.

show abstract

“…In an ice plant test rig, the VCR cycle is considered with an assumption that the cycle is working without pressure drop in the condenser, evaporator and in all refrigerant pipe lines [10,19]. Therefore, the discharged and suction pressures measured by the pressure gauges are assumed to be equivalent to the condensing and evaporating pressures.…”

Section: Performance Analysismentioning

confidence: 99%

“…Power consumption of system has also been reduced by 11%. Ohunakin et al [10] experimentally studied the effect of TiO 2 , SiO 2 , and Al 2 O 3 nanoparticles mixed with mineral oil in a domestic refrigerator using liquefied petroleum gas (LPG) as the refrigerant. Result showed that TiO 2 and SiO 2 reduced 13% and 12% power consumptions, respectively, compared to base refrigerant (LPG).…”

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.

View full text Add to dashboard Cite

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.

show abstract

Experimental investigation of TiO2-, SiO2- and Al2O3-lubricants for a domestic refrigerator system using LPG as working fluid

Cited by 68 publications

References 47 publications

Performance of a domestic refrigerator in varying ambient temperatures, concentrations of TiO2 nanolubricants and R600a refrigerant charges

Performance of a domestic refrigerator in varying ambient temperatures, concentrations of TiO2 nanolubricants and R600a refrigerant charges

The effect of silica nanoparticle on thermal, chemical, corrosive, and the nature‐friendly properties of refrigerant compressor lubricants—A comparative study

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

Contact Info

Product

Resources

About