A tribological study of refrigeration oils under HFC-134a environment
HFC-134a is a potential alternative material for CFC-12, which depletes the ozone layer. However, problems arise when used together with conventional refrigeration oils due to the extreme polarities of HFC-134a. PAG (polyalkylene glycol) and esters are tested with HFC-134a. This investigation enhanc...
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Published in | Tribology international Vol. 30; no. 9; pp. 707 - 716 |
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Format | Journal Article |
Language | English |
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Oxford
Elsevier Ltd
1997
Elsevier |
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Abstract | HFC-134a is a potential alternative material for CFC-12, which depletes the ozone layer. However, problems arise when used together with conventional refrigeration oils due to the extreme polarities of HFC-134a. PAG (polyalkylene glycol) and esters are tested with HFC-134a. This investigation enhances the testing method by taking the compressor's environment into account. Miscibility and material compatibility are proved with sealed glass tests. A testing environment charged with refrigerant gas more closely simulates the conditions of a compressor. The conventional refrigeration oils (mineral oils, alkylbenzene, PAO (polyalpha olefin)) tested here are immiscible with HFC-134a. However the PAG and ester oils are miscible with HFC-134a. The friction coefficient of the PAG/HFC-134a system is similar to that of the mineral oil/CFC-12 system at operating conditions. Ester oils are preferable at the start and stop condition in the lubricity aspect. PAG shows good lubricity in conditions of extreme contact pressure. Consequently, this test provides reliable results on compressor lubricity and material compatibility of refrigeration oils with HFC-134a. It suggests a methodological way for the proper selection of refrigeration oils that may improve the durability and performance of a compressor. |
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AbstractList | HFC-134a is a potential alternative material for CFC-12, which depletes the ozone layer. However, problems arise when used together with conventional refrigeration oils due to the extreme polarities of HFC-134a. PAG (polyalkylene glycol) and esters are tested with HFC-134a. This investigation enhances the testing method by taking the compressor's environment into account. Miscibility and material compatibility are proved with sealed glass tests. A testing environment charged with refrigerant gas more closely simulates the conditions of a compressor. The conventional refrigeration oils (mineral oils, alkylbenzene, PAO (polyalpha olefin)) tested here are immiscible with HFC-134a. However the PAG and ester oils are miscible with HFC-134a. The friction coefficient of the PAG/HFC-134a system is similar to that of the mineral oil/CFC-12 system at operating conditions. Ester oils are preferable at the start and stop condition in the lubricity aspect. PAG shows good lubricity in conditions of extreme contact pressure. Consequently, this test provides reliable results on compressor lubricity and material compatibility of refrigeration oils with HFC-134a. It suggests a methodological way for the proper selection of refrigeration oils that may improve the durability and performance of a compressor. |
Author | Chul Na, Byung Han, Dong-Chul Jin Chun, Keyoung |
Author_xml | – sequence: 1 givenname: Byung surname: Chul Na fullname: Chul Na, Byung organization: Engine Engineering Lab., Korea Automotive Technology Institute, 74, Yongjong-ri, Pungse-myun, Chonan-si, ChungChongnam-do, 330-910, South Korea – sequence: 2 givenname: Keyoung surname: Jin Chun fullname: Jin Chun, Keyoung organization: Industrial Automation Technology R and D Center, Korea Institute of Industrial Technology, San. 17-1, Hongchon-ri, Ibjang-myun, Chonan-si, ChungChongnam-do, 330-820, South Korea – sequence: 3 givenname: Dong-Chul surname: Han fullname: Han, Dong-Chul organization: Department of Mechanical Design and Production Engineering, Seoul National University, Seoul, 151-742, South Korea |
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Keywords | refrigeration oil close type wear tester alternative refrigerant boundary lubrication friction wear profile Lubricating oil Ester Wear test Miscibility Olefin oxide polymer Friction test Boundary lubrication Material compatibility Experimental study Refrigerant fluid Tribology |
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SubjectTerms | alternative refrigerant Applied sciences boundary lubrication close type wear tester Energy Energy. Thermal use of fuels Exact sciences and technology friction Friction, wear, lubrication Machine components Mechanical engineering. Machine design Refrigerants Refrigerating engineering Refrigerating engineering. Cryogenics. Food conservation refrigeration oil wear profile |
Title | A tribological study of refrigeration oils under HFC-134a environment |
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