Lubrication behavior of the POE/R452A mixture at different sliding velocities under starved lubrication conditions
[ 1 ] Instytut Maszyn Roboczych i Pojazdów Samochodowych, Wydział Inżynierii Lądowej i Transportu, Politechnika Poznańska | [ P ] pracownik
PL Właściwości smarne mieszaniny POE/R452A przy różnych prędkościach ślizgania w warunkach skąpego smarowania
2024
artykuł naukowy
angielski
- oil/refrigerant mixture
- lubricating properties
- starved lubrication conditions
- sliding velocity
- mieszanina olej/czynnik chłodniczy
- właściwości smarne
- skąpe smarowanie
- prędkość ślizgania
- czynnik chłodniczy
- olej
- sprężarki chłodnicze
EN There are no international standards guiding tribological testing in oil-refrigerant mixtures. The conditions for tribological tests, including sliding velocity, are chosen arbitrarily. The article presents an attempt to examine the influence of the sliding velocity of friction pair elements on the coefficient of friction and lubricating properties of compressor polyester oil (POE) and its mixture with the R452A refrigerant (POE/R452A) under starved lubrication conditions. The R452A refrigerant is currently widely used in transportation refrigeration. The authors’ original test procedure with the use of a model block-on-ring type friction pair was applied to evaluate the lubricating properties of the oil-refrigerant mixture. Tests were conducted in three operational situations: no lubrication, starved lubrication with POE oil, and starved lubrication with the POE/R452A mixture. In each case, the tests were performed at different sliding velocities and the same sliding distance. A series of tests was also conducted where the load was increased in steps by 20 N to determine the relationship between the coefficient of friction, sliding velocity, and load on the friction pair. The results support the potential use of higher sliding velocities and the reduction in test duration. For starved lubrication with the POE oil and the POE/R452A mixture, the differences in wear at specific velocities for the same sliding distance reached up to 30%, and the rankings of lubricating properties at different velocities remained unchanged.
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