The properties of the oil selected must be suitable for this purpose. The refrigerating oil is highly miscible with the refrigerant and enters the condenser and the evaporator with the refrigerant. synthetic oil suitable for refrigeration systems using CFC or HCFC refrigerants. As always if you see something that I missed or something that is incorrect please reach out to me by clicking this link. refrigerant and oil, the new oil must be miscible with the old oil in the system. Chances are that if you have an older R-22 unit installed that it is most likely using mineral oil. Alkyl Benzene oil is synthetic whereas mineral oil is not.) (hFC)-based refrigerant that is a blend of three refrigerants: r125 (pentafluoroethane), r143 (1,1,2-trifluoroethane) and r134a (1,1,1,2-tetrafluoroethane). How Much Is R-410A Refrigerant Per Pound in 2021? Refrigerant Oil Basics - HVAC School R32 has poor miscibility with refrigeration oils relative to R410A, R32 causes a large drop in the viscosity of the oil when dissolved in it. (2) the cloud point is lower than the evaporation temperature; u Cloud point: Traces of paraffin remain in the frozen oil. (4) The flash point is high enough: 20-30 degrees higher than the compressed exhaust gas temperature. Regardless of what I have said above the safest method for when choosing an oil to use in your refrigeration unit is to follow the instructions on the compressor. - Toxicity - Leak detection - Flammability - Miscibility with oil - Effect on foodstuff - Stability Physical properties of refrigerant. As a .result, used refrigerant oil must be categorized as off- specificailon used oil. Due to the miscibility of oil and refrigerant, used refrigerant oil often becomes contaminated with chlorine and fluorine (halogens) at concentrations greater than 4,000 ppm. Mineral oils can also be used with other refrigerants such as Ammonia or some Hydrocarbons as well. u Flash point: the lowest temperature at which flash oil vaporizes when in contact with flame, (5) Good chemical stability: low acid value. It is formulated from specially refined paraffinic base oils in combination with additives selected to minimise system deposits and provide long service life. PAG oil, or Polyalkylene Glycol, is a fully synthetic hygroscopic oil specifically designed for automotive air conditioner compressors. In case of good miscibility between the refrigerant gas and the oil, if the oil is carried into the circuit it will come back easily with refrigerant. For typical industrial systems, oil carryover is 15% or less. This all changed when the phase out of CFC/HCFC refrigerants began in the 1990’s and 2000’s. The lower viscosity grade of the oil, the lower LCST of the refrigerant/lubricant mixture. Excellent solubility and excellent stability with HCFC refrigerants, Particularly good miscibility with HCFC refrigerants, such as R22. Vapor pressure (solubility) is measured using calibrated, constant volume cells at oil mass fractions 30, 50, 70, 80, and 90% over a temperature range from -20 to 100 °C, and pressures up to 5 MPa. If refrigerant oil did the same thing—that is, if it remained in the The oil-refrigerant mixture Investigation Of Low GWP Refrigerant Interaction With Various Lubricant Candidates Roger J. Beattie Roger.firstname.lastname@example.org ... the miscibility of low GWP refrigerants with lubricants that can affect oil ... low oil carry-over and good oil sealing. These can include some of your most common refrigerants such as R-404A and R-410A. As mentioned in our mineral oil section the POE oil was selected for HFC usage to achieve acceptable miscibility between the refrigerant and the oil and also to provide sufficient lubrication to the compressor. Suitable for very low evaporation temperatures down to -80° C. There are many different types of oil that are used in the refrigeration cycle and it all depends mostly on two things: But, what are the different kinds of oils out there? These can include some of your most common refrigerants such as R-404A and R-410A. It revealed that OMO-2 oil possessed the better miscibility with R22 than SUNISO 3GS oil at lower mass fraction (<15%), which was shown in Fig. What kind of refrigerant you are working with. HFC refrigerants on the market today are the primary users of POE oil. CompStar® SK Series is fully synthetic refrigeration oils based on chemically and thermally stable alkyl benzene. As a side effect, part of it is carried by the refrigerant and circulates through the entire cycle. (Please note that while Alkyl Benzene oil can be used as a replacement in most mineral oil applications these two oils are not the exact same. Figure 1 represents the miscibility of each refrigerant with mineral oil. Is there a 1234yf Air Conditioner Recharge Kit? The first is miscibility with R32, because the current refrigeration oils designed for R410A have poor miscibility with R32. 5. Therefore, the refrigerating oil has to lubricate and cool the moving parts without adversely affecting the refrigeration system. Is there one that is better over the other? In addition to the favorable miscibility characteristics with the corresponding refrigerant, good cold flow properties, high aging resistance and high chemical and thermal stability play an important role. These types of oils have been used in refrigeration for decades. Something that can be confusing to a lot of technicians rather they are a residential tech, commercial tech, or a mechanic is refrigerant oil. - Miscibility with the refrigerant in the liquid state. When HFC refrigerants began to gain popularity the use of mineral oils started to decline. 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