Friction and Wear of Lubricated Sliding Surfaces of Coated Vane and Flange in Rotary Compressor with Carbon Dioxide as a Refrigerant

2007 ◽  
Vol 353-358 ◽  
pp. 1785-1788
Author(s):  
Hong Gyu Jeon ◽  
Kyu Sun Lee ◽  
Sung Oug Cho ◽  
Young Ze Lee
Keyword(s):  
Carbon Dioxide ◽  
Friction And Wear ◽  
Hard Coatings ◽  
Rotary Compressor ◽  
Sliding Surfaces ◽  
Natural Refrigerant ◽  
Air Conditioning Systems ◽  
Friction And Wear Characteristics ◽  
Rotary Type ◽  
Lubricated Sliding

Due to the environmental concerns, especially the greenhouse effect and GWP (Global Warming Potential), the carbon dioxide was investigated as an alternative natural refrigerant to replace HFCs (HydroFluoroCarbons) in refrigerator or air conditioning systems. To develop new compressor, especially rotary type, the friction and wear characteristics of sliding surfaces between vane and flange in the rotary compressor were evaluated in this paper. Several hard coatings, such as TiN, CrN and WC/C, were applied on vane surfaces in order to improve the tribological characteristics, and their performances were evaluated experimentally. The vane-on-flange type lubricated sliding tests were performed with a high pressure wear tester using HFC (R410A) and carbon dioxide. From the tests, wear volumes of vane surfaces applied with various coatings were compared each other.

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

Tribology ◽  
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.

The Tribological Behaviors of the Surfaces Lubricated by Polyaklylene Glycol and Polyolester Oils in Carbon Dioxide Environment

2006 ◽  
Vol 321-323 ◽  
pp. 1548-1551
Author(s):  
Se Doo Oh ◽  
Tae Shik Ahn ◽  
Sung Oug Cho ◽  
Young Ze Lee
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Hard Coatings ◽  
Rotary Compressor ◽  
Wear Volume ◽  
Test Results ◽  
Sliding Surfaces ◽  
Carbon Dioxide Co2 ◽  
Air Conditioning Systems ◽  
Rotary Type

The carbon dioxide (CO2) is investigated as an alternative refrigerant to replace HFC (hydro fluorocarbon) 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, and WC/C, 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.

Experimental Investigation on Friction and Wear of Coated Vane under the Environments of Lubricants and CO2 as a Refrigerant

2006 ◽  
Vol 326-328 ◽  
pp. 1185-1188 ◽  
Author(s):  
Se Doo Oh ◽  
Kyu Sun Lee ◽  
Jin Sun Kim ◽  
Sung Oug Cho ◽  
Young Ze Lee
Keyword(s):  
High Pressure ◽  
Friction And Wear ◽  
Hard Coatings ◽  
Rotary Compressor ◽  
Test Results ◽  
Sliding Surfaces ◽  
Polyalkylene Glycol ◽  
Air Conditioning Systems ◽  
Crn Coatings ◽  
Rotary Type

The CO2 was investigated as an alternative refrigerant to replace HFC (hydrofluorocarbons) 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 and WC/C, 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, wear volumes of vane surfaces applied various coatings were compared. Test results showed that WC/C and CrN coatings showed good tribological properties. Also, the results of the sliding tests showed that using PAG oil has an advantage over POE oil in CO2 environment.

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

2006 ◽  
Vol 110 ◽  
pp. 271-0 ◽  
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 ◽  
Natural Refrigerant ◽  
Rotary Type

The tribology of lubricated sliding vanes in the rotary compressor was investigated to replace the HFC refrigerants by the carbon dioxide. The carbon dioxide is a natural refrigerant and very favorable to environment. 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.

Tribological Characteristics of Coated Vane Surfaces Under Mixed Environments of Various Oils and CO2 as a Refrigerant

2005 ◽  
Author(s):  
Se-Doo Oh ◽  
Kyung-Soo Kim ◽  
Sung-Oug Cho ◽  
Young-Ze Lee
Keyword(s):  
High Pressure ◽  
Friction And Wear ◽  
Hard Coatings ◽  
Tribological Characteristics ◽  
Rotary Compressor ◽  
Wear Volume ◽  
Test Results ◽  
Sliding Surfaces ◽  
Polyalkylene Glycol ◽  
Air Conditioning Systems

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.

Friction and Wear of Flange and Shaft in Compressor under the Environments of PAG Oil and Carbon Dioxide as a Refrigerant

2007 ◽  
Vol 345-346 ◽  
pp. 1059-1062 ◽  
Author(s):  
Kyu Sun Lee ◽  
Hong Gyu Jeon ◽  
Sung Oug Cho ◽  
Young Ze Lee
Keyword(s):  
Carbon Dioxide ◽  
Friction And Wear ◽  
Protective Layer ◽  
Tribological Characteristics ◽  
Spheroidal Graphite ◽  
Sliding Surfaces ◽  
Frictional Forces ◽  
Natural Refrigerant ◽  
Pin On Disk ◽  
Rotary Type

In order to protect the global environment, especially on the point of the greenhouse effect, carbon dioxide should be used as a natural refrigerant. Because new compressors with CO2 are going to be operated under the high pressure, the interaction between sliding surfaces in the compressor becomes very important. To develop new compressor, especially rotary type, the friction and wear characteristics of sliding surfaces were very important. In this paper, the surface interactions between a shaft and a flange, which were one of the contacting parts in compressor, were evaluated. The frictional forces and wear amounts in boundary lubricated sliding condition were measured using the pin-on-disk tester. Two types of refrigerants were used, namely R410A and CO2 to compare the tribological characteristics of conventionally used one with new natural refrigerant. It was found that CO2 lead to a bad lubricity as compared with R410A or pure oil due to the formation of relatively thin protective layer on the sliding surface. Smooth surface of shaft produced lower values of friction and wear than rough surfaces. The smooth surfaces represented much more spheroidal graphite, which had very favorable tribological characteristics, on the sliding surfaces.

Friction and Wear of POE and PAG Oils in the Carbon Dioxide Environment

2007 ◽  
Vol 120 ◽  
pp. 163-168 ◽  
Author(s):  
Se Doo Oh ◽  
Sung Oug Cho ◽  
Young Ze Lee
Keyword(s):  
Carbon Dioxide ◽  
Surface Roughness ◽  
Friction And Wear ◽  
Normal Load ◽  
Attractive Alternative ◽  
Friction Forces ◽  
Rotating Speed ◽  
Sliding Surfaces ◽  
Natural Refrigerant ◽  
Air Conditioning Systems

The carbon dioxide (R-744) as a natural refrigerant has been an attractive alternative refrigerant to replace HFC (hydrofluorocarbon) refrigerants currently used 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 scroll type, the friction and wear characteristics of sliding surfaces between a fixed scroll and an orbiting scroll in the scroll compressor were investigated in this paper. The sliding tests of pin-on-disk type were carried out between scroll surfaces under various sliding speeds, normal loads, surface roughness, and refrigerant pressures. Two types of lubricants were used, namely POE (polyol ester) oil and PAG (polyalkylene glycol) oil. The friction forces, wear amounts and surface temperatures were monitored during the tests. Test results showed that the wear amounts increased with increasing normal load and rotating speed, and also decreased with decreasing surface roughness. Also, the results of the sliding tests showed that using PAG oil has an advantage over POE oil in CO2 environment. As the pressure of CO2 refrigerant became higher, the amount of wear and coefficient of friction became larger in CO2/POE mixed environment, but wear and friction remained constant in CO2/PAG mixed environment. The wear coefficients in CO2/PAG and CO2/POE mixed environment were 8.60×10-9 ㎣/N·m and 2.35×10-8 ㎣/N·m, respectively.

Friction and wear characteristics of hard coatings

Wear ◽  
2001 ◽  
Vol 251 (1-12) ◽  
pp. 990-996 ◽  
Author(s):  
Malcolm K Stanford ◽  
Vinod K Jain
Keyword(s):  
Friction And Wear ◽  
Hard Coatings ◽  
Wear Characteristics ◽  
Friction And Wear Characteristics
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