5231 High-Pressure Viscosity Measurements of Vegetable Based Biodegradable Oils up to 2.5GPa and Tribological Characteristics

The CO2 is investigated as an alternative refrigerant to replace HFC refrigerant in air conditioning systems due to the environmental concerns. Because new compressors with CO2 are going to be operated under the high pressure, the tribology of sliding surfaces in the compressor becomes very important. To develop new compressor, especially rotary type, the friction and wear characteristics of sliding surfaces between a vane and a roller in the rotary compressor were evaluated in this paper. Several hard coatings, such as TiN, CrN, WC/C and two types of nitridings, were applied on vane surfaces in order to improve the tribological characteristics, and their performances were evaluated experimentally. Two types of lubricants were used, namely POE (polyol ester) oil and PAG (polyalkylene glycol) oil. The vane-on-disk type sliding tests were performed with an exclusive high pressure wear tester. From the tests, coefficient of friction and wear volume of vane surfaces applied various coatings were compared. Test results showed that WC/C coatings showed good tribological properties. TiN and CrN coated vanes showed good wear resistance properties but produced high friction. Also, the results of the sliding tests showed that using PAG oil has an advantage over POE oil in CO2 environment.

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Viscosity Measurements of Two Potential Deepwater Viscosity Standard Reference Fluids at High Temperature and High Pressure

Journal of Chemical & Engineering Data ◽

10.1021/acs.jced.6b00128 ◽

2016 ◽

Vol 61 (8) ◽

pp. 2712-2719 ◽

Cited By ~ 7

Author(s):

Hseen O. Baled ◽

Deepak Tapriyal ◽

Isaac K. Gamwo ◽

Babatunde A. Bamgbade ◽

Mark A. McHugh ◽

...

Keyword(s):

High Pressure ◽

High Temperature ◽

Viscosity Measurements

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The Tribological Characteristics of the Surface Coatings on Rotary Compressor Vane in Carbon Dioxide Environment

Tribology ◽

10.1115/imece2005-80123 ◽

2005 ◽

Author(s):

Se-Doo Oh ◽

Young-Ze Lee

Keyword(s):

Carbon Dioxide ◽

High Pressure ◽

Hard Coatings ◽

Tribological Characteristics ◽

Rotary Compressor ◽

Wear Volume ◽

Test Results ◽

Sliding Surfaces ◽

Air Conditioning Systems ◽

Rotary Type

The carbon dioxide is investigated as an alternative refrigerant to replace HFC refrigerants in refrigerators and air conditioning systems due to the environmental concerns. Because new compressors with the carbon dioxide are going to be operated under the high pressure, the tribology of sliding surfaces in the compressor becomes very important. To develop new compressors, especially rotary type, the friction and wear characteristics of sliding surfaces between a vane and a roller in the rotary compressor were evaluated in this paper. Several hard coatings, such as TiN, CrN, WC/C and two types of nitridings, were applied on vane surfaces in order to improve the tribological characteristics, and their performances were evaluated experimentally. The vane-on-disk type sliding tests were carried out under the various sliding speeds, normal loads, and carbon dioxide pressures with an exclusive high pressure wear tester. From the tests wear volume of vane surfaces applied various coatings were compared. During the tests coefficients of friction and surface temperatures were monitored. Test results showed that WC/C coatings showed good tribological properties. TiN and CrN coated vanes showed good wear resistance properties but produced high friction.

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