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Abstract

The electrohydrodynamic (EHD) properties of polyolester (POE) in refrigerant environments were determined with a ball-on-sapphire disc-type EHD tester. The film thickness and the traction were both lower for hydrofluoroether HFE-245mc than for hydrofluorocarbon (HFC) at an identical gas pressure. This is because of the higher refrigerant concentration (RC) for HFE-245mc than for HFC, which resulted in a lower atmospheric viscosity and a lower viscosity-pressure coefficient of the refrigerant/POE mixture for HFE-245mc. The boundary lubrication performance was studied with a block-on-ring type tribometer. The coefficient of friction in HFE-245mc was lower than that in HFC, and HFE-245mc was superior to HFC in terms of antiwear performance. X-ray photoelectron spectroscopy (XPS) of the surface film showed the presence of FeF₂ and iron oxide whose concentration was much higher, and the boundary film thickness was much thicker for HFE-245mc than for HFC. Thus, it was inferred that HFE-245mc adsorbed on to the rubbing surface was decomposed to form an effective antiwear film having a low shear resistance which resulted in reduction in the friction and wear.

Keywords

electrohydrodynamic (EHD)polyolester film thickness hydrofluoroether refrigerant

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References

Sekiya

Misaki

Development of hydrofluoroethers as alternative refrigerants and other applications. In Proceedings of International Conference on

Ozone Protection Technologies, Baltimore, 12-13 November 1997, pp. 26–33.

Iizuka

Ishiyama

Hata

Performance and tribology of a refrigerator using alternative refrigerants

J. JAST, 1995, 40 (9), 712–717.

Komatuszaki

Homma

Antiseizure and antiwear properties of lubricating oils under refrigerant gas environments

J. STLE, 1991, 47 (3), 193–198.

Mizuhara

The friction and wear behavior in controlled alternative refrigerant atmosphere

Tribology Trans., 1994, 37, 120–128.

Muraki

Refrigeration lubricants based on polyolester for alternative refrigerants. In Proceedings of International Symposium on

R22 and R502 Alternative Refrigerants, Kobe, 8-9 December 1994, pp. 101–106.

Sunami

Takigawa

Suda

Optimization of POE type refrigeration lubricants. In Proceedings of International Refrigeration Conference, Purdue, 1994, pp. 153–158.

Muraki

Tagawa

Dong

Refrigeration lubricant based on polyolester for use with HFCs and prospect of its application with R-22. Part 1: tribological characteristics. In Proceedings of International Refrigeration Conference, Purdue, 1996, pp. 273–278.

Muraki

Dong

Sano

Friction and wear characteristics of polyolester base lubricants in refrigerants environment

J. JAST, 1998, 43 (1), 43–49.

B. C.

Chun

K. J.

Han

D. C.

A tribological study of refrigeration oils under HFC-134a environment

Tribology Int., 1998, 30 (9), 707–716.

10.

Sundaresan

S. G.

Finkensatad

W. R.

Polyalkylene glycol and polyolester lubricant candidates for use with HFC-134a in refrigeration compressors

ASHRAE Trans., 1992, 5, 796–803.

11.

Tseregounis

S. I.

Wear and galling of 356-T6 aluminum-on-steel in low amplitude reciprocating sliding in the presence of synthetic lubricants in HFC-134a atmosphere

Tribology Trans., 1996, 39 (1), 1–12.

12.

Short

G. D.

Cavestri

R. C.

High-viscosity ester lubricants for alternative refrigerants

ASHRAE Trans., 1992, 5 (2), 789–795.

13.

Yoon

H. K.

Sheiretov

Cusano

Tribological evaluation of some aluminum-based materials in lubricant/ refrigerant mixtures

Wear, 1998, 218 (1), 54–63.

14.

Remigy

J. C.

Nakache

Brechot

P. D.

Structure effect of refrigeration polyolester oils for use in HFC-134a compressors

J. Synth. Lubric., 1997, 14 (3), 237–247.

15.

Yoon

H. K.

Poppe

Cusano

Screening lubricants for refrigerant compressors. A comparison between a pin and block tester and the high pressure tribometer

ASHRAE Trans., 1995, 101 (2), 322–334.

16.

Chao

S. H.

Baek

C. G.

Kim

Y. W.

Hyun

S. K.

A study of overall tribological problems in developing R407C rotary compressor with polyolester oils. In Proceedings of International Compressor Engineering Conference, Purdue, 1996, pp. 269–274.

17.

Tanaka

Kyogoku

Nakahara

Lubrication characteristics of refrigerating/air conditioning rotary compressor-mixed lubrication analysis on vane tip

J. JAST, 1996, 41 (3), 247–254.

18.

Wardle

F. P.

Jacobsson

Dolfsma

Hoglund

Jonsson

The effect of refrigerants on the lubrication of rolling element bearings used in screw compressors. In Proceedings of International Compressor Conference, Purdue, 1992, pp. 523–534.

19.

Jonsson

U. J.

Hoglund

E. B.

Determination of viscosities of oil-refrigerant mixtures at equilibrium by means of film thickness measurements

ASHRAE Trans., 1993, 99 (2), 1129–1136.

20.

Akei

Mizuhara

The elastohydrodynamic properties of lubricants in refrigerant environments

Tribology Trans., 1997, 40 (1), 1–10.

21.

Muraki

Sano

Dong

Determination of EHD film thickness and traction characteristics of polyol ester under an EHD contact in some refrigerant environments

STLE Tribology Trans., 2000, 43 (1), 15–20.

22.

JRA Handbook, Fundamentals, 1993 (Japanese Association of Refrigeration).

23.

Foord

C. A.

Hammann

W. C.

Cameron

Evaluation of lubricants using optical elastohydrodynamics

ASLE Trans., 1968, 11, 31–43.

24.

Dowson

Higginson

G. R.

Elasto-Hydrodynamic Lubrication, SI edition, 1977 (Pergamon Press).

25.

Muraki

Sano

Dong

Rheological properties of polyol ester under an EHD contact in some refrigerant environments

Trans. ASME, 2001, 123 (1), 54–60.

26.

Lide

D. R.

(Ed.) CRC Handbook of Chemistry and Physics, 73rd edition, 1992–1993, pp. 9–145 (CRC Press, Boca Raton, Florida).

Elastohydrodynamic properties and boundary lubrication performance of polyolester in a hydrofluoroether refrigerant environment

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