As I stated above the primary users of PAG oil are automotive applications. Certain content that appears on this site comes from Amazon Services LLC. The Trucking Industry & the Coming Shortage of R-134a. (2) the cloud point is lower than the evaporation temperature; u Cloud point: Traces of paraffin remain in the frozen oil. For example, if oil return with the new refrigerant HFO-1234yf was optimized by choosing a new additive technology for RENISO PAG 1234. It is also suitable for systems using CFC, HCFC … 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. Product Review: Elitech IR-200 Dual Sensor Leak Detector, Tariffs on Chinese Imported R-134A Refrigerant. 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? In this chapter, the thermodynamic properties of R-134a, Polyalkylene Glycol (PAG) oil and their mixture were investigated. @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. (hFC)-based refrigerant that is a blend of three refrigerants: r125 (pentafluoroethane), r143 (1,1,2-trifluoroethane) and r134a (1,1,1,2-tetrafluoroethane). The lower viscosity grade of the oil, the lower LCST of the refrigerant/lubricant mixture. Until recently mineral oils were the default lubricant used in refrigeration systems. As always if you see something that I missed or something that is incorrect please reach out to me by clicking this link. (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. Alkyl Benzene oil is synthetic whereas mineral oil is not.) In order to determine the correct PAG viscosity for your vehicle you will need to look up the specifications of your make and model of your vehicle either online or in the instruction manual. Otherwise, you could be looking at the wrong oil not circulating through the system and accumulating in your evaporator. The temperature at this time is called the cloud point. 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. 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. - Solubility with the refrigerant in the gaseous state. Mineral refrigerant oil, also known as Alkyl Benzene oil, is probably the one that most of you are used to. (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. Good miscibility and solubility facilitate the return of oil to the compressor, which is important for its reliable opera-tion and for system performance. CP 4214-320 is a specially designed, high-molecular-weight polyolester lubricant for use with R-22 in screw chillers. - Lubricity: related to the thickness of the oil film. These can include some of your most common refrigerants such as R-404A and R-410A. - Toxicity - Leak detection - Flammability - Miscibility with oil - Effect on foodstuff - Stability Physical properties of refrigerant. To stabilise the oil balance, suitable measures for continuous oil return must be taken. How Much Is R-134a Refrigerant Per Pound in 2021? When the temperature drops to a certain value, the paraffin begins to precipitate. Ammonia on the other hand is not miscible and a specific system design is required to separate the oil The refrigerating oil is highly miscible with the refrigerant and enters the condenser and the evaporator with the refrigerant. R32 is a refrigerant that excels in various applications and has seen wide use in recent years. Relationship Between Refrigeration Oil And Compressor, How To Distinguish Poor Quality Refrigerant. How Much Is R-1234yf Refrigerant Per Pound in 2021? XIAMEN JUDA TRADING CO.,LTD.COOLMAX INDUSTRIAL CO.,LTD. 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. Excellent solubility and excellent stability with HCFC refrigerants, Particularly good miscibility with HCFC refrigerants, such as R22. CompStar® SK Series is fully synthetic refrigeration oils based on chemically and thermally stable alkyl benzene. 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 %. This efficiency improvement is largely attributed to higher viscosity under dilution and temperature conditions. These types of oils have been used in refrigeration for decades. It shows better miscibility with R-22 at low temperatures, providing improved oil return. This behaviour is determined in pressure-resistant glass tubes or in autoclaves. 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. 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. 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. refrigerant and oil, the new oil must be miscible with the old oil in the system. The physical, chemical and thermal properties of the frozen oil should meet the following requirements: (1) Appropriate viscosity: The viscosity is too large, the flow resistance is large, the frictional power consumption and starting resistance of the compressor will increase; the viscosity is too small, the lubricant film is not easily formed, and the sealing property is also affected. - Viscosity: resistance to temperature variations. The oils have good miscibility with R-12 and superior stability. PAG oil, or Polyalkylene Glycol, is a fully synthetic hygroscopic oil specifically designed for automotive air conditioner compressors. 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. It also maintains good lubricity and sealing characteristics in the screw compressor. 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. HFC units could not use mineral oils due to them proving insufficient lubrication and due to the mixing ability of mineral oils. This content is provided 'As is' and is subject to change or removal at any time. At the same time, the miscibility gap (LCST) differ much bigger for various refrigerant/lubricant mixtures. Utilization of non-CFC refrigerants urges compressor engineers to develop new refrigeration oils compatible with the CfC alternatives. https://refrigeranthq.com/ is a participant in the Amazon Services LLC Associates Program and The E-Bay Partner Program, affiliate advertising programs designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com or E-Bay.com. - Flocculation point: important, particularly in the context of installation conversion. Refrigerator Compressor Lubricant Shell Refrigeration Oil S2 FR-A is a low miscibility compressor lubricant intended for use in refrigeration compressors using Ammonia refrigerant. Best practice is to ensure everything is set and ready before pulling the plugs on the compressor. The oil return characteristics and heat transfer effects of the lubricants are being studied again. Chances are that if you have an older R-22 unit installed that it is most likely using mineral oil. Different concentrations of oil-refrigerant mixtures are tested. On the one hand, the results confirmed the favourable solubility of HCFCs refrigerants with the mineral oils. Generally, when the refrigerant has good miscibility with the refrigeration oil, dissolved refrigerant will … The refrigerant dissolved in the oil significantly reduces the viscosity, improving oil fluidity and minimising the negative influence on heat transfer in heat exchangers. These can include some of your most common refrigerants such as R-404A and R-410A. In an automotive engine, motor oil stays in the crankcase where it belongs. How Much Is R-410A Refrigerant Per Pound in 2021? HFC refrigerants on the market today are the primary users of POE oil. The first is miscibility with R32, because the current refrigeration oils designed for R410A have poor miscibility with R32. 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. the same 20%/80% oil/refrigerant ratio. 10. Suitable for very low evaporation temperatures down to -80° C. POE Oil, or Poly Olester Oil, is a synthetic oil that was designed to meet the needs of the changing refrigeration industry. Therefore, the refrigerating oil has to lubricate and cool the moving parts without adversely affecting the refrigeration system. Because of this the time allowed for the compressor to be exposed to the atmosphere has to be short. This study tries to identify influence of oil-refrigerant solubility on the performance of refrigerant compressors. Is there one that is better over the other? Figure 1 represents the miscibility of each refrigerant with mineral oil. In some instances there are some HFC refrigerants and compressors out there that were designed as drop-in replacements for older HCFC units. Recommended for Retrofitting with HCFC Service Blends Because of its exceptional history in working with R-22, due primarily to its excellent miscibility with this refrigerant, Zerol has been identified by compressor and equipment manufacturers as the oil of choice in retrofitting to the One last point of note is that POE oils absorb moisture at a much faster rate than mineral oil. Since the entire automotive market is switching soon over to the HFO 1234yf I would like to also point out that YF refrigerant also takes PAG oil as well. 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. Best practice is to ensure everything is set and ready before pulling the plugs on the compressor. Application RENISO PAG 1234 is a synthetic refrigeration oil 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. However, R32 is known to have lower miscibility with refrigeration oils than … 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. 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. We do not directly sell any products or refrigerants, but rather provide information, knowledge, and explanations to the consumer. Thanks for reading and I hope that I was able to answer your questions. The properties of the oil selected must be suitable for this purpose. • Miscibility occurs when the refrigerant is in the liquid phase and mixes with the lubricant. The second issue is lubricity. When looking at PAG oil you will notice various numbers such as PAG46 or PAG100. In these cases using mineral oils may be acceptable but again always check with the compressor and the refrigerant to ensure accuracy. This could eventually cause failure of the compressor and other components due to little or no lubrication. The refrigerating oil is highly miscible with the refrigerant and enters the condenser and the evaporator with the refrigerant. Remember, one of the leading causes of failures in automotive HVAC is contamination. Xiamen Juda Trading Co.,Ltd welcomes your comments! (4) The flash point is high enough: 20-30 degrees higher than the compressed exhaust gas temperature. 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. 2。 3, refrigerant and oil solubility . It is used in R-134a air conditioning systems to lubricate the compressor. u Flash point: the lowest temperature at which flash oil vaporizes when in contact with flame, (5) Good chemical stability: low acid value. Oils that are soluble and miscible with the refrigerant are advantageous. 5. Also the refrigerant miscibility of RENISO PAG 1234 is favourable: a safe oil transport is guaranteed, no matter if R134 a or HFO-1234yf is used as refrigerant. If refrigerant oil did the same thing—that is, if it remained in the If the system suffers from inadequate refrigerant return, then it may be necessary to flush the original oil and replace with POE. in the refrigeration temperature range, and … POE has good miscibility with mineral oils, whereas PAG oils have poor miscibility. These numbers refer to the viscosity of the oil, similar to 10W30 oil. miscibility with standard viscosity of the lubricant. How Much Is R-404A Refrigerant Per Pound in 2021? Therefore, the refrigerating oil has to lubricate and cool the moving parts without adversely affecting the refrigeration system. Depending on the type of compressor different kinds of … (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. Most of the time new compressors will come prefilled with oil but if they are not or you need to add oil to your system then please please use what the compressor calls for. Less carbon build-up and good shear stability helps to extend drain intervals. Reports have also indicated superior adiabatic efficiency of three to ten percent in these compressors when compared to naphthenic refrigeration oils. Miscibility of Refrigeration Oil and Refrigerant. eval(ez_write_tag([[300,600],'refrigeranthq_com-large-leaderboard-1','ezslot_2',112,'0','0']));report this ad. But the miscible status of the mixed solution tended to be worse as the mass fraction of OMO-2 increased, especially at the range of 17–37%. In refrigeration systems, lubricant oil cannot be considered alone, because it functions as a refrigerant-oil mixture. Refrigerant miscibility according to DIN 51514: The miscibility behaviour of the refrigeration oil with various refrigerants is shown in miscibility-gap diagrams. In order to further improve oil performance, the problem is how to achieve good miscibility with the refrigerant while ensuring sufficient viscosity when the refrigerant is dissolved in the oil. The physical, chemical and thermal properties of the frozen oil should meet the following requirements: This all changed when the phase out of CFC/HCFC refrigerants began in the 1990’s and 2000’s. Lastly, some companies have stated that it is ok to mix oils like Mineral with POE but from what I have found in my research the best advice is to NOT mix oils. The long lifetime expectations of refrigerant compressors are closely related to the high quality requirements of the used lubricants. - Miscibility with the refrigerant in the liquid state. Something that can be confusing to a lot of technicians rather they are a residential tech, commercial tech, or a mechanic is refrigerant oil. How Much Is Refrigerant Per Pound In 2021? Lastly, just like POE oils PAG oils are hygroscopic and can 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. The miscibility values of promising refrigerants RE170 and mixed refrigerant RE170/R227ea with a mineral oil were studied. Refrigerants that commonly used mineral oils were your CFC and HCFC refrigerants such as R-12, R-22, and R-502. What kind of refrigerant you are working with. It is formulated from specially refined paraffinic base oils in combination with additives selected to minimise system deposits and provide long service life.

*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. Mineral oils can also be used with other refrigerants such as Ammonia or some Hydrocarbons as well. 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. As a .result, used refrigerant oil must be categorized as off- specificailon used oil. The oil-refrigerant mixture As a side effect, part of it is carried by the refrigerant and circulates through the entire cycle. Oil is used in refrigeration systems to lubricate compressor bearings and other moving parts. 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. One of the most important characteristics of the oil is miscibility with refrigerant and good miscibility is usually acceptable. 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. Is there a 1234yf Air Conditioner Recharge Kit? POE oils is also more hydrolytic stable than PAG oils. Refrigerant Oil Basics - HVAC School By blending a Polyolester (POE) – The most common oil utilized in refrigeration and air conditioning systems using HFC / HFO refrigerants. 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. synthetic oil suitable for refrigeration systems using CFC or HCFC refrigerants. What the manufacturer of the compressor calls for. Let’s take some time and find out. 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. 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. Refrigerant oil is … 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. 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 … For typical industrial systems, oil carryover is 15% or less. Please fill this form to give us feedback or report any problem when experiencing our website. How Much Is R-22 Refrigerant Per Pound in 2021? How do they differ? 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