Rheological Properties of Polyolester Under an EHD Contact in Some Refrigerant Environments

Muraki, Masayoshi; Sano, Takashi; Dong, Darning

doi:10.1115/1.1326443

Cited by 8 publications

(7 citation statements)

References 21 publications

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“…There was a decrease in viscosity reduction with an increase in the ratio of the HFC-134a solubility to the mean molecular weight of the lubricant. HFC-125, HFC-134a and HCFC-22 were used with POE lubricant by [59] to study the rheological properties of polyolester oil under elastohydrodynamic (EHD) contact conditions in refrigerant environments. Analytical work as well as experimentation involving a ball-on-disk EHD tester were used in this study.…”

Section: Hydrofluorocarbons (Hfcs)mentioning

confidence: 99%

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A Historical Review on the Tribological Performance of Refrigerants used in Compressors

Bhutta¹,

Khan²,

Garland³

et al. 2018

Tribol. Ind.

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Refrigerants directly affect the tribological performance of interacting components in a compressor. Since the introduction of artificially formulated refrigerants, the types of refrigerants used in compressors have changed over the years. Apart from evaluating the physical, chemical and thermodynamic properties of refrigerants, the refrigerants have also been studied from a view point of tribology by various researchers worldwide. Changing a refrigerant in a compressor not only has an effect on the thermodynamic cycle but also effects the lubricants viscosity, lubricants pressure-viscosity coefficient, oil film thickness, lubricant/refrigerant miscibility, friction, wear, durability, reliability and overall power consumption. Refrigerants have been studied from a view point of tribology by varying the contact geometries, by using different lubricating oils with and without additives, by altering the environmental pressure/temperature, by changing the phase of the refrigerant, by using different interacting materials and by applying numerous surface treatments. The tribological behavior of refrigerants can be better understood by consolidating the findings in a comprehensive manner. An indepth review on the tribological behavior of refrigerants is missing from the literature. This article reviews the tribological studies carried out on refrigerants, with focus on refrigerants used in domestic appliances, automobile air-conditioning systems and small scale industrial and commercial applications.

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Section: Hydrofluorocarbons (Hfcs)mentioning

confidence: 99%

“…9 indicated that the relation of the viscous volume with the molecular volume can be represented by a single line irrespective of the refrigerants. [60] and the symbols are the measure data (a) at gas pressure of 100 kPa, (b) at gas pressure of 300 kPa [59].…”

Section: Hydrofluorocarbons (Hfcs)mentioning

confidence: 99%

A Historical Review on the Tribological Performance of Refrigerants used in Compressors

Bhutta¹,

Khan²,

Garland³

et al. 2018

Tribol. Ind.

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“…However, as the EHD technique has shown an improvement of the heat transfer on refrigerant side (Muraki et al, 2001), it is believed that magnetic field could have an enhancement effect on heat transfer properties. Several studies have been reported on the use of magnetic elements in enhancing the performance in many applications such as oil, natural gas furnaces, diesel engines, fuel lines and also in water treatment.…”

Section: Introductionmentioning

confidence: 99%

Effect of magnetic field on the performance of new refrigerant mixtures

Sami

Aucoin

2003

Int. J. Energy Res.

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SUMMARYPerformance test results of new alternative refrigerant mixtures such as R-410A, R-507, R-407C, and R-404A under various conditions of magnetic field are discussed, analysed and presented. The test results were obtained using an air-source heat pump set-up with enhanced surface tubing under various magnetic field conditions. Performance tests were conducted according to the ARI/ASHRAE Standards.The test results demonstrated that as magnetic field force increases, compressor head pressure and discharge temperature slightly increase as well as less liquid refrigerant is boiling in the compressor shell. This has a positive effect in protecting the compressor. The effect of magnetic field on mixture behaviour varies from one mixture to another depending upon the mixture's composition and its boiling point. Furthermore, the use of magnetic field appears to have a positive influence on the system COP as well as thermal capacities of condenser and evaporator.

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“…Muraki et al. 5 implemented a ball-on-disk elastohydrodynamic (EHD) test-rig within an autoclave for allowing a gas pressure environment. They measured film thickness and traction generated by mixtures of PE blended with HCFC-22, HFC-125, or HFC-134a: they further derived the averaged mixture rheological properties by fitting the experimental data with traction models.…”

Section: Background and Introductionmentioning

confidence: 99%

An experimental and modeling assessment of the HCFC-R123 refrigerant capabilities for lubricating rolling EHD circular contacts

Vergne

Fillot

Bouscharain

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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This work aims at investigating the capabilities of the hydrochlorofluorocarbon (HCFC)-R123 refrigerant for lubricating rolling elastohydrodynamic circular contacts. The viscosity pressure and temperature dependence of this fluid, used in oil-free compressors, are first studied in its liquid phase. Complementary data like density variations are taken from the thermo-physics literature. Besides, film thickness measurements using a ball-on-disk tribometer equipped with an interferometry facility have been performed under pure rolling conditions. For the same operating conditions, film thickness is then predicted from a numerical elastohydrodynamic model in which the viscosity and density dependencies with pressure and temperature are described using physics-based relationships, allowing a quantitative approach. The results obtained from the full numerical model, from the analytical elastohydrodynamic film-thickness expressions, and from the experiments show an acceptable agreement. They clearly reveal that indeed refrigerants can build up a reasonable film thickness for lubricating elastohydrodynamic rolling point contacts.

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Rheological Properties of Polyolester Under an EHD Contact in Some Refrigerant Environments

Cited by 8 publications

References 21 publications

A Historical Review on the Tribological Performance of Refrigerants used in Compressors

A Historical Review on the Tribological Performance of Refrigerants used in Compressors

Effect of magnetic field on the performance of new refrigerant mixtures

An experimental and modeling assessment of the HCFC-R123 refrigerant capabilities for lubricating rolling EHD circular contacts

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