Because of this the time allowed for the compressor to be exposed to the atmosphere is much much shorter than what you may be used to for R-22. In some instances the mixed oil doesn’t flow correctly and you could end up with the same result as before of having it pile up in your evaporator instead of circulating and again potentially causing damage to the system. How Much Is R-134a Refrigerant Per Pound in 2021? 5. Because of this the time allowed for the compressor to be exposed to the atmosphere has to be short. Refrigerants that commonly used mineral oils were your CFC and HCFC refrigerants such as R-12, R-22, and R-502. For example, if oil return While these synthetic oils have been around for decades they were always seen as too expensive when it came to using in CFC or HCFC systems. (4) The flash point is high enough: 20-30 degrees higher than the compressed exhaust gas temperature. miscibility with standard viscosity of the lubricant. Is there one that is better over the other? It shows better miscibility with R-22 at low temperatures, providing improved oil return. The oil-refrigerant mixture How Much Is R-1234yf Refrigerant Per Pound in 2021? It also maintains good lubricity and sealing characteristics in the screw compressor. - Viscosity: resistance to temperature variations. However, R32 is known to have lower miscibility with refrigeration oils than … Refrigerant Oil Basics - HVAC School Suitable for very low evaporation temperatures down to -80° C. When the temperature drops to a certain value, the paraffin begins to precipitate. Oils that are soluble and miscible with the refrigerant are advantageous. This could eventually cause failure of the compressor and other components due to little or no lubrication. Something that can be confusing to a lot of technicians rather they are a residential tech, commercial tech, or a mechanic is refrigerant oil. Refrigerant miscibility according to DIN 51514: The miscibility behaviour of the refrigeration oil with various refrigerants is shown in miscibility-gap diagrams. Figure 1 represents the miscibility of each refrigerant with mineral oil. The goal of a refrigerant lubricant is to lubricate the compressor and to also have the appropriate miscibility and solubility characteristics to interact with the refrigerant accordingly. The Trucking Industry & the Coming Shortage of R-134a. It is used in R-134a air conditioning systems to lubricate the compressor. POE Oil, or Poly Olester Oil, is a synthetic oil that was designed to meet the needs of the changing refrigeration industry. HFC units could not use mineral oils due to them proving insufficient lubrication and due to the mixing ability of mineral oils. As a side effect, part of it is carried by the refrigerant and circulates through the entire cycle. This all changed when the phase out of CFC/HCFC refrigerants began in the 1990’s and 2000’s. Systems using R 12 as refrigerant use mineral oil as lubricant and SEETUL RFL grades are found compatible with residual mineral oils and R 12 grades. In refrigeration systems, lubricant oil cannot be considered alone, because it functions as a refrigerant-oil mixture. 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. (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. He said there are those within the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) who are looking at the issue, but \"these are just the beginnings of the investigative process. Thanks for reading and I hope that I was able to answer your questions. The oils have good miscibility with R-12 and superior stability. These numbers refer to the viscosity of the oil, similar to 10W30 oil. The first is miscibility with R32, because the current refrigeration oils designed for R410A have poor miscibility with R32. - Flocculation point: important, particularly in the context of installation conversion. Product Review: Elitech IR-200 Dual Sensor Leak Detector, Tariffs on Chinese Imported R-134A Refrigerant. It is also suitable for systems using CFC, HCFC … (3) The freezing point is sufficiently low; (the freezing point of the R22 system is below 55 degrees below zero), u Freezing point: the temperature at which the frozen oil loses fluidity. For typical industrial systems, oil carryover is 15% or less. How Much Is R-22 Refrigerant Per Pound in 2021? Previous: Relationship Between Refrigeration Oil And Compressor, Next: How To Distinguish Poor Quality Refrigerant, Halocarbon C318 C4F8 Octafluorocyclobutane Used as Propellant in Food industry and Refrigerants, Miscibility Of Refrigeration Oil And Refrigerant. 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. Alkyl Benzene oil is synthetic whereas mineral oil is not.) It is compatible with mineral oil and compared to mineral oil, it has improved refrigerant miscibility at low-temperature conditions which is why it was and is often used with HCFC refrigerants in commercial refrigeration. If the system suffers from inadequate refrigerant return, then it may be necessary to flush the original oil and replace with POE. These can include some of your most common refrigerants such as R-404A and R-410A. If refrigerant oil did the same thing—that is, if it remained in the CompStar® SK Series is fully synthetic refrigeration oils based on chemically and thermally stable alkyl benzene. 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. Please fill this form to give us feedback or report any problem when experiencing our website. Refrigerant blends: Classification and experiences ... R290 (Propane) is added as the third component to R402A/B and R403A/B to improve miscibility with traditional lubricants as hydrocarbons have especially good solubility characteristics. Miscibility charts are specific to lubricant-refrigerant combinations and are read based on the evaporator temperature and the percentage of oil carried over into the evaporator for the application in question. POE oils is also more hydrolytic stable than PAG oils. 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