An Experimental Study on the Improvement of Coefficient of Performance in Vapor Compression Refrigeration System Using Graphene Lubricant Additives

Raghavulu, K. Veera; Rasu, N. Govindha

doi:10.1080/15567036.2021.1909186

Cited by 11 publications

(3 citation statements)

References 38 publications

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“…Three samples of nanolubricant were prepared for which graphene nanoparticles, of three varying concentrations (0.05, 0.10, and 0.15) [27], were blended with POE oil using a magnetic stirrer. Each mixture was stirred for two hours.…”

Section: Formation Of Nanolubricantmentioning

confidence: 99%

“…Specific graphene morphologies have been discussed in the literature, for instance ball structure, exhibit superior lubricant performance [25,26]. Veera Raghavalu and Rasu [27] performed an experimental study that attempted to improve the Coefficient of Performance (COP) in vapor compression refrigeration systems using graphene lubricant additives with POE oil. The authors found that the blended POE oil with graphene nanoparticles achieved better performance than raw base oil (POE oil).…”

Section: Introductionmentioning

confidence: 99%

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Taguchi optimization of process parameters used for improving tribological behaviour of graphene nanoparticle dispersed nanolubricant

Raghavulu¹,

Rasu²

2022

Eng. Res. Express

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The present study attempts to analyze the influence of specific process parameters that influence the tribological behavior of polyolester (POE) oils with Graphene nanoparticle-based additive. Graphene nanoparticle blends as additives for lubricant oil gained immense attention in recent years. Graphene is a two-dimensional material that possesses unique wear and friction characteristics; it can also serve as a colloidal or solid lubricant. To analyze the impact of factors, such as concentration of Graphene nanoparticles in POE oil, Sliding Velocity, and the Applied Load, on the tribological characteristics of the lubricant, the Taguchi robust design method is used. Best combination of the considered factors and the most important factor that affects the tribological behavior of the lubricants are brought out. In addition, the friction and wear properties of the lubricants are evaluated using a pin on disc type tribo test rig. Analysis of variance (ANOVA) is performed to analyze the significance of the considered control factors. The best combination of control factors will provide a minimum Coefficient of friction (COF). Thereby, in this study to improving the performance of the nano lubricant mixture, the optimum control factors are Graphene Nanoparticles- 0.05%, Sliding Velocity- 3.6 m/s, and Applied Load – 50 N.

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Section: Formation Of Nanolubricantmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Taguchi optimization of process parameters used for improving tribological behaviour of graphene nanoparticle dispersed nanolubricant

Raghavulu¹,

Rasu²

2022

Eng. Res. Express

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“…Using traditional solution-based nanofluids can improve heat transmission even more [5,6]. Recent numerical and experimental investigations have demonstrated that the use of nanofluids as secondary working fluids-coolant on the condenser side and secondary refrigerant on the evaporator side-could improve the heat transfer properties and performance of the refrigeration [7]. Jatropha oil with copper oxide has also recently attracted interest due to its improved ability to transport heat.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Copper Oxide–Jatropha Oil Nanofluid as a Secondary Refrigerant

Gobane

Dama

Hasan

et al. 2023

Journal of Nanomaterials

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Nanofluid is a new fluid with special characteristics that can be used in various industrial heat transfer applications. The nanofluid was created using the two-step approach of dispersing nanoparticles into Jatropha oil. The experiments were conducted for four samples of mixture nanofluid at four different volume concentrations of 0.5%, 1.0%, 1.5%, and 2%. The nanoparticles were characterized by X-ray diffractometric analysis, X-ray fluorescence spectroscopy, and scanning electron microscopy. The greatest increase in thermal conductivity for CuO–Jatropha oil nanofluids was made possible by 0.5%, 1.0%, 1.5%, and 2% mixture was 4.5%, 6.01%, 7.6, and 9.1%. The study observed that a mixture achieved the highest thermal conductivity for nanofluid at 2%. At a mixture of 0.5%, the lowest value of thermal conductivity within the range under consideration, a “deeding” effect was seen. To determine the thermal conductivity of CuO–Jatropha oil nanofluids based on temperature, volume concentration, and nanoparticle mixture volume concentrations, the study suggested and compared four sample models. The effect of nanoparticles on the rise of thermal conductivity and viscosity was investigated at temperatures ranging from 298 to 323 K. The X-ray diffractometer is used to characterize nanoparticles. Viscosity and thermal conductivity have been tested in the lab. The findings show that the copper oxide nanoparticles improved the base fluid’s thermophysical abilities more than Jatropha oil alone. For the evaluation of the thermal conductivity and viscosity of nanofluid, new empirical correlations were presented based on experimental data. The thermal conductivity of the nanofluids increases as the temperature rises, while the viscosity of the nanofluids decreases.

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Investigation on the performance improvement of household refrigeration system using R-134a refrigerant blended with ceria nano additives

Arumuganainar¹,

Edwin

Raj³

2022

Appl Nanosci

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An Experimental Study on the Improvement of Coefficient of Performance in Vapor Compression Refrigeration System Using Graphene Lubricant Additives

Cited by 11 publications

References 38 publications

Taguchi optimization of process parameters used for improving tribological behaviour of graphene nanoparticle dispersed nanolubricant

Taguchi optimization of process parameters used for improving tribological behaviour of graphene nanoparticle dispersed nanolubricant

Characterization of Copper Oxide–Jatropha Oil Nanofluid as a Secondary Refrigerant

Investigation on the performance improvement of household refrigeration system using R-134a refrigerant blended with ceria nano additives

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