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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 대한설비공학회 International Journal of Air-Conditioning and Refrigeration Journal Of Air-Conditioning and Refrigeration Vol.3
- 발행연도
- 1995.8
- 수록면
- 42 - 57 (16page)
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One of the chlorofluorocarbon compounds, R-12 deplete atmospheric ozone. It leads to international agreement to reduce CFC production. R-134a has similar thermodynamic properties to CFC-12. It has zero ODP(Ozone Depletion Potential). This paper focuses on lubricating oils for used with R-134a. PAGs(Polyalkylene Glycol's) and esters are primary refrigeration oils that are now being tested for use with R-134a. Because of the extreme polarity of R-134a, there are many problems in the selection of the lubricating oil. This investigation analyzes the working conditions of the compressor and calculates the experimental conditions of wear parts. Miscibility and material compatibility are proved by sealed glass tests. Friction was tested on the closed type pin-on-disk wear tester. This equipment emulates an actual refrigerating compressor. The environment controlled test made more reliable results than the field test. Conventional oils(mineral oils, Alkylbenzene, PAO(Polyalpha Olefin)) are immiscible with R-134a. PAGs and ester oils are miscible with R-134a. The friction coefficient is similar to the coefficient of mineral oil/R-12 systems at operating conditions. At start & stop condition, PAGs/R-134a system has a high friction coefficient. When the contact pressure is extremely high, ester oil systems occur metal contact which makes failure. PAG is more preferable to the condition of extreme contact pressure. Ester oils are preferable to boundary lubrication.
It provides reliable results on lubricity, miscibility, material compatibility of R-134a with these new oils. It suggests proper selection of oil that may improve compressor durability or performance.
It provides reliable results on lubricity, miscibility, material compatibility of R-134a with these new oils. It suggests proper selection of oil that may improve compressor durability or performance.
목차
Abstract
1. Introduction
2. Experimental Equipment
3. Testing Materials
4. Testing Procedure
5. Results and Discussion
6. Conclusion
References
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