Oils that are soluble and miscible with the refrigerant are advantageous. Generally, when the refrigerant has good miscibility with the refrigeration oil, dissolved refrigerant will … - Toxicity - Leak detection - Flammability - Miscibility with oil - Effect on foodstuff - Stability Physical properties of refrigerant. How Much Is R-404A Refrigerant Per Pound in 2021? What kind of refrigerant you are working with. Utilization of non-CFC refrigerants urges compressor engineers to develop new refrigeration oils compatible with the CfC alternatives. - Miscibility with the refrigerant in the liquid state. (6) Low impurity content: 1kg of frozen oil should contain less than 40mg of water and no mechanical impurities; (7) Good insulation performance: the breakdown voltage is required to be above 25kV. R32 is a refrigerant that excels in various applications and has seen wide use in recent years. different refrigerant liquid and the lubricating oil solubility is different, the same refrigerant oil with different solubility is different also, some complete miscibility, sometimes almost insoluble, dissolve and some parts. One last point of note is that POE oils absorb moisture at a much faster rate than mineral oil. When HFC refrigerants began to gain popularity the use of mineral oils started to decline. Product Review: Elitech IR-200 Dual Sensor Leak Detector, Tariffs on Chinese Imported R-134A Refrigerant. These can include some of your most common refrigerants such as R-404A and R-410A. The physical, chemical and thermal properties of the frozen oil should meet the following requirements: (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. It is formulated from specially refined paraffinic base oils in combination with additives selected to minimise system deposits and provide long service life.
As I stated above the primary users of PAG oil are automotive applications. (4) The flash point is high enough: 20-30 degrees higher than the compressed exhaust gas temperature. Miscibility of Refrigeration Oil and Refrigerant. To stabilise the oil balance, suitable measures for continuous oil return must be taken. Figure 1 represents the miscibility of each refrigerant with mineral oil. These numbers refer to the viscosity of the oil, similar to 10W30 oil. Mineral oils can also be used with other refrigerants such as Ammonia or some Hydrocarbons as well. For typical industrial systems, oil carryover is 15% or less. When the temperature drops to a certain value, the paraffin begins to precipitate. HFC refrigerants on the market today are the primary users of POE oil. 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. Mineral refrigerant oil, also known as Alkyl Benzene oil, is probably the one that most of you are used to. 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. R -40 1 A showed phase separation at the highest temperatures, with a maximum separation temperature above 80"F. The next best miscible product was R-409A, which showed a maximum separation temperature at 23"F. R … As a side effect, part of it is carried by the refrigerant and circulates through the entire cycle. - Lubricity: related to the thickness of the oil film. PAG oil, or Polyalkylene Glycol, is a fully synthetic hygroscopic oil specifically designed for automotive air conditioner compressors. The lower viscosity grade of the oil, the lower LCST of the refrigerant/lubricant mixture. - Viscosity: resistance to temperature variations. refrigerant and oil, the new oil must be miscible with the old oil in the system. This efficiency improvement is largely attributed to higher viscosity under dilution and temperature conditions. At the same time, the miscibility gap (LCST) differ much bigger for various refrigerant/lubricant mixtures. Miscibility and stability in R 12, the older systems using the R 12 gasses were evaluated and cSt over temperature range -40 to 100°C show no abnormality in ranger concentration of 1 - 30 %. As always if you see something that I missed or something that is incorrect please reach out to me by clicking this link. Refrigerant oil is … How do they differ? 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. Alkyl Benzene oil is synthetic whereas mineral oil is not.) Remember, one of the leading causes of failures in automotive HVAC is contamination. Less carbon build-up and good shear stability helps to extend drain intervals. Different concentrations of oil-refrigerant mixtures are tested. The temperature at this time is called the cloud point. - Flocculation point: important, particularly in the context of installation conversion. Relationship Between Refrigeration Oil And Compressor, How To Distinguish Poor Quality Refrigerant. XIAMEN JUDA TRADING CO.,LTD.COOLMAX INDUSTRIAL CO.,LTD. POE oils is also more hydrolytic stable than PAG oils. miscibility with standard viscosity of the lubricant. The long lifetime expectations of refrigerant compressors are closely related to the high quality requirements of the used lubricants. 5. CompStar® SK Series is fully synthetic refrigeration oils based on chemically and thermally stable alkyl benzene. *HFC retrofit gases operate best with POE oils, however they have been designed to operate also with MO and AB oils that were commonly used with R22. 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. POE has good miscibility with mineral oils, whereas PAG oils have poor miscibility. These types of oils have been used in refrigeration for decades. For example, if oil return 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. This content is provided 'As is' and is subject to change or removal at any time. Best practice is to ensure everything is set and ready before pulling the plugs on the compressor. In these cases using mineral oils may be acceptable but again always check with the compressor and the refrigerant to ensure accuracy. Application RENISO PAG 1234 is a synthetic refrigeration oil Investigation Of Low GWP Refrigerant Interaction With Various Lubricant Candidates Roger J. Beattie Roger.beattie@lubrizol.com ... the miscibility of low GWP refrigerants with lubricants that can affect oil ... low oil carry-over and good oil sealing. Excellent solubility and excellent stability with HCFC refrigerants, Particularly good miscibility with HCFC refrigerants, such as R22. Refrigerator Compressor Lubricant Shell Refrigeration Oil S2 FR-A is a low miscibility compressor lubricant intended for use in refrigeration compressors using Ammonia refrigerant. It is also suitable for systems using CFC, HCFC … Chances are that if you have an older R-22 unit installed that it is most likely using mineral oil. Refrigerants that commonly used mineral oils were your CFC and HCFC refrigerants such as R-12, R-22, and R-502. Suitable for very low evaporation temperatures down to -80° C. Therefore, the refrigerating oil has to lubricate and cool the moving parts without adversely affecting the refrigeration system. Ammonia on the other hand is not miscible and a specific system design is required to separate the oil In an automotive engine, motor oil stays in the crankcase where it belongs. Best practice is to ensure everything is set and ready before pulling the plugs on the compressor. (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. 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. @article{osti_417971, title = {Oil-return characteristics of refrigerant oils in split heat pump system}, author = {Sundaresan, S G and Radermacher, R}, abstractNote = {Currently, HFC substitute refrigerants for R-22 are being evaluated in air-conditioning and heat pump applications. Is there one that is better over the other? 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. 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. How Much Is R-134a Refrigerant Per Pound in 2021? Thanks for reading and I hope that I was able to answer your questions. 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