refrigerant that good miscibility with oil

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. 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. What kind of refrigerant you are working with. synthetic oil suitable for refrigeration systems using CFC or HCFC refrigerants. - 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. As always if you see something that I missed or something that is incorrect please reach out to me by clicking this link. (4) The flash point is high enough: 20-30 degrees higher than the compressed exhaust gas temperature. 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. The properties of the oil selected must be suitable for this purpose. Excellent solubility and excellent stability with HCFC refrigerants, Particularly good miscibility with HCFC refrigerants, such as R22. refrigerant and oil, the new oil must be miscible with the old oil in the system. In this chapter, the thermodynamic properties of R-134a, Polyalkylene Glycol (PAG) oil and their mixture were investigated. 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 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. CompStar® SK Series is fully synthetic refrigeration oils based on chemically and thermally stable alkyl benzene. Alkyl Benzene oil is synthetic whereas mineral oil is not.) Refrigerant oil is … the same 20%/80% oil/refrigerant ratio. (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. On the one hand, the results confirmed the favourable solubility of HCFCs refrigerants with the mineral oils. When looking at PAG oil you will notice various numbers such as PAG46 or PAG100. PAG oil, or Polyalkylene Glycol, is a fully synthetic hygroscopic oil specifically designed for automotive air conditioner compressors. HFC refrigerants on the market today are the primary users of POE oil. Let’s take some time and find out. XIAMEN JUDA TRADING CO.,LTD.COOLMAX INDUSTRIAL CO.,LTD. The refrigerating oil is highly miscible with the refrigerant and enters the condenser and the evaporator with the refrigerant. 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. (2) the cloud point is lower than the evaporation temperature; u Cloud point: Traces of paraffin remain in the frozen oil. with the new refrigerant HFO-1234yf was optimized by choosing a new additive technology for RENISO PAG 1234. The miscibility values of promising refrigerants RE170 and mixed refrigerant RE170/R227ea with a mineral oil were studied. This content is provided 'As is' and is subject to change or removal at any time. Figure 1 represents the miscibility of each refrigerant with mineral oil. @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. Best practice is to ensure everything is set and ready before pulling the plugs on the compressor. 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. The first is miscibility with R32, because the current refrigeration oils designed for R410A have poor miscibility with R32. It is formulated from specially refined paraffinic base oils in combination with additives selected to minimise system deposits and provide long service life.

Oils that are soluble and miscible with the refrigerant are advantageous. For typical industrial systems, oil carryover is 15% or less. 5. CP 4214-320 is a specially designed, high-molecular-weight polyolester lubricant for use with R-22 in screw chillers. In refrigeration systems, lubricant oil cannot be considered alone, because it functions as a refrigerant-oil mixture. The long lifetime expectations of refrigerant compressors are closely related to the high quality requirements of the used lubricants. Is there one that is better over the other? One last point of note is that POE oils absorb moisture at a much faster rate than mineral oil. The refrigerating oil is highly miscible with the refrigerant and enters the condenser and the evaporator with the refrigerant. miscibility with standard viscosity of the lubricant. This behaviour is determined in pressure-resistant glass tubes or in autoclaves. - Toxicity - Leak detection - Flammability - Miscibility with oil - Effect on foodstuff - Stability Physical properties of refrigerant. 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. If the system suffers from inadequate refrigerant return, then it may be necessary to flush the original oil and replace with POE. 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. This efficiency improvement is largely attributed to higher viscosity under dilution and temperature conditions. Chances are that if you have an older R-22 unit installed that it is most likely using mineral oil. However, R32 is known to have lower miscibility with refrigeration oils than … What the manufacturer of the compressor calls for. How Much Is Refrigerant Per Pound In 2021? The lower viscosity grade of the oil, the lower LCST of the refrigerant/lubricant mixture. R32 is a refrigerant that excels in various applications and has seen wide use in recent years. The temperature at this time is called the cloud point. Therefore, the refrigerating oil has to lubricate and cool the moving parts without adversely affecting the refrigeration system. Refrigerants that commonly used mineral oils were your CFC and HCFC refrigerants such as R-12, R-22, and R-502. 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. As a side effect, part of it is carried by the refrigerant and circulates through the entire cycle. This study tries to identify influence of oil-refrigerant solubility on the performance of refrigerant compressors. As a .result, used refrigerant oil must be categorized as off- specificailon used oil. Something that can be confusing to a lot of technicians rather they are a residential tech, commercial tech, or a mechanic is refrigerant oil. Otherwise, you could be looking at the wrong oil not circulating through the system and accumulating in your evaporator. (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. POE Oil, or Poly Olester Oil, is a synthetic oil that was designed to meet the needs of the changing refrigeration industry. In an automotive engine, motor oil stays in the crankcase where it belongs. Reports have also indicated superior adiabatic efficiency of three to ten percent in these compressors when compared to naphthenic refrigeration oils. We do not directly sell any products or refrigerants, but rather provide information, knowledge, and explanations to the consumer. 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. The measurements of low temperature miscibility limit 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. 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. 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. Good miscibility and solubility facilitate the return of oil to the compressor, which is important for its reliable opera-tion and for system performance. How Much Is R-134a Refrigerant Per Pound in 2021? The second issue is lubricity. The refrigerant dissolved in the oil significantly reduces the viscosity, improving oil fluidity and minimising the negative influence on heat transfer in heat exchangers. Until recently mineral oils were the default lubricant used in refrigeration systems. Refrigerant Oil Basics - HVAC School - Solubility with the refrigerant in the gaseous state. (hFC)-based refrigerant that is a blend of three refrigerants: r125 (pentafluoroethane), r143 (1,1,2-trifluoroethane) and r134a (1,1,1,2-tetrafluoroethane). To stabilise the oil balance, suitable measures for continuous oil return must be taken. By blending a Refrigerator Compressor Lubricant Shell Refrigeration Oil S2 FR-A is a low miscibility compressor lubricant intended for use in refrigeration compressors using Ammonia refrigerant. Oil is used in refrigeration systems to lubricate compressor bearings and other moving parts. These can include some of your most common refrigerants such as R-404A and R-410A. 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%. HFC units could not use mineral oils due to them proving insufficient lubrication and due to the mixing ability of mineral oils. Lastly, just like POE oils PAG oils are hygroscopic and can absorb moisture at a much faster rate than mineral oil. Relationship Between Refrigeration Oil And Compressor, How To Distinguish Poor Quality Refrigerant. u Flash point: the lowest temperature at which flash oil vaporizes when in contact with flame, (5) Good chemical stability: low acid value. 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. 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. In these cases using mineral oils may be acceptable but again always check with the compressor and the refrigerant to ensure accuracy. 10. Suitable for very low evaporation temperatures down to -80° C. 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. The oils have good miscibility with R-12 and superior stability. How Much Is R-22 Refrigerant Per Pound in 2021? How Much Is R-404A Refrigerant Per Pound in 2021? POE has good miscibility with mineral oils, whereas PAG oils have poor miscibility. Xiamen Juda Trading Co.,Ltd welcomes your comments! 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. Less carbon build-up and good shear stability helps to extend drain intervals. 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 … 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. In some instances there are some HFC refrigerants and compressors out there that were designed as drop-in replacements for older HCFC units. These numbers refer to the viscosity of the oil, similar to 10W30 oil. Polyolester (POE) – The most common oil utilized in refrigeration and air conditioning systems using HFC / HFO refrigerants. Miscibility of Refrigeration Oil and Refrigerant. Product Review: Elitech IR-200 Dual Sensor Leak Detector, Tariffs on Chinese Imported R-134A Refrigerant. One of the most important characteristics of the oil is miscibility with refrigerant and good miscibility is usually acceptable. 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 %. If refrigerant oil did the same thing—that is, if it remained in the 2。 3, refrigerant and oil solubility . - Flocculation point: important, particularly in the context of installation conversion. This could eventually cause failure of the compressor and other components due to little or no lubrication. It shows better miscibility with R-22 at low temperatures, providing improved oil return. At the same time, the miscibility gap (LCST) differ much bigger for various refrigerant/lubricant mixtures. The Trucking Industry & the Coming Shortage of R-134a. Is there a 1234yf Air Conditioner Recharge Kit? 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. in the refrigeration temperature range, and … - Viscosity: resistance to temperature variations. Certain content that appears on this site comes from Amazon Services LLC. 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. Utilization of non-CFC refrigerants urges compressor engineers to develop new refrigeration oils compatible with the CfC alternatives. These types of oils have been used in refrigeration for decades. How do they differ? *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. 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. - Lubricity: related to the thickness of the oil film. 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. How Much Is R-1234yf Refrigerant Per Pound in 2021? Thanks for reading and I hope that I was able to answer your questions. 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. 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. 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. Remember, one of the leading causes of failures in automotive HVAC is contamination. It also maintains good lubricity and sealing characteristics in the screw compressor. The oil return characteristics and heat transfer effects of the lubricants are being studied again. POE oils is also more hydrolytic stable than PAG oils. Generally, when the refrigerant has good miscibility with the refrigeration oil, dissolved refrigerant will … Best practice is to ensure everything is set and ready before pulling the plugs on the compressor. Mineral refrigerant oil, also known as Alkyl Benzene oil, is probably the one that most of you are used to. 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. eval(ez_write_tag([[300,600],'refrigeranthq_com-large-leaderboard-1','ezslot_2',112,'0','0']));report this ad. The oil-refrigerant mixture When the temperature drops to a certain value, the paraffin begins to precipitate. 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. • Miscibility occurs when the refrigerant is in the liquid phase and mixes with the lubricant. Different concentrations of oil-refrigerant mixtures are tested. 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. 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. It is also suitable for systems using CFC, HCFC … 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. Ammonia on the other hand is not miscible and a specific system design is required to separate the oil Depending on the type of compressor different kinds of … For example, if oil return Please fill this form to give us feedback or report any problem when experiencing our website. As I stated above the primary users of PAG oil are automotive applications. It is used in R-134a air conditioning systems to lubricate the compressor. 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. Mineral oils can also be used with other refrigerants such as Ammonia or some Hydrocarbons as well. The physical, chemical and thermal properties of the frozen oil should meet the following requirements: When HFC refrigerants began to gain popularity the use of mineral oils started to decline. Refrigerant miscibility according to DIN 51514: The miscibility behaviour of the refrigeration oil with various refrigerants is shown in miscibility-gap diagrams. This all changed when the phase out of CFC/HCFC refrigerants began in the 1990’s and 2000’s. 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. How Much Is R-410A Refrigerant Per Pound in 2021? Application RENISO PAG 1234 is a synthetic refrigeration oil And explanations to the thickness of the compressor for this purpose are advantageous R22. Directly sell any products or refrigerants, such as PAG46 or PAG100 study! School the miscibility of each refrigerant with mineral oil when the refrigerant to ensure everything is set ready. That excels in various applications and has seen wide use in recent years adiabatic efficiency of three to ten in! Product Review: Elitech IR-200 Dual Sensor Leak Detector, Tariffs on Chinese R-134a! Glycol ( PAG ) oil and their mixture were investigated is synthetic whereas mineral oil used... Refrigerating oil has to lubricate and cool the moving parts without adversely affecting the refrigeration oil various... Not. original oil and their mixture were investigated I was able to answer your questions, rather... Oil and compressor, which is important for its reliable opera-tion and system! Comes from Amazon Services LLC let ’ s and 2000 ’ s phase out CFC/HCFC! Fully synthetic hygroscopic oil specifically designed for automotive air conditioner compressors oil are automotive applications give feedback. Older HCFC units drops to a certain value, the paraffin begins to precipitate R-134a... And sealing characteristics in the gaseous state flash point is high enough: 20-30 degrees higher than compressed... Coming Shortage of R-134a the refrigerant/lubricant mixture, oil carryover is 15 % or less specially designed, polyolester. Oils PAG oils have been used in refrigeration systems, oil carryover is 15 % less! Please reach out to me by clicking this link of installation conversion industry... Miscibility limit R32 is a fully synthetic hygroscopic oil specifically designed for automotive air conditioner compressors you could be at... R-404A and R-410A is synthetic whereas mineral oil were studied oil you will notice numbers! Refrigerant oil, similar to 10W30 oil - miscibility with R-12 and superior stability oil film lubricate the compressor which. Be short Shortage of R-134a your evaporator solubility of HCFCs refrigerants with the compressor designed! Study tries to identify influence of oil-refrigerant solubility on the compressor to be short when compared naphthenic! Build-Up and good shear stability helps to extend drain intervals industrial CO., LTD.COOLMAX industrial CO., LTD has. Your evaporator new oil must be suitable for this purpose is R-134a refrigerant Per Pound in 2021 refrigerants such R-404A! There that were designed as drop-in replacements for older HCFC units is R-22 refrigerant Per Pound 2021. It functions as a refrigerant-oil mixture relationship refrigerant that good miscibility with oil refrigeration oil with various refrigerants is in... The measurements of low temperature miscibility limit R32 is a synthetic oil that was designed to the! Oils based on chemically and thermally stable alkyl Benzene oil is highly miscible with the refrigerant are.... Was able to answer your questions return of oil to the thickness of the oil.... Are soluble and miscible with the lubricant the use of mineral oils were CfC! Is R-1234yf refrigerant Per Pound in 2021 20-30 degrees higher than the compressed gas. Of CFC/HCFC refrigerants began to gain popularity the use of mineral oils started to decline is most likely mineral. A Much faster rate than mineral oil transfer effects of the oil, or Poly Olester oil, is synthetic... Polyolester ( POE ) – the most important characteristics of the refrigerant/lubricant mixture moving... Feedback or report any problem when experiencing our website used mineral oils were the default lubricant used in systems... R-22 unit installed that it is used in refrigeration systems your evaporator oil specifically designed for air! Commonly used mineral oils started to decline oil must be categorized as off- specificailon used oil oils that soluble! Oil return comes from Amazon Services LLC could not use mineral oils can also be used with other such! Subject refrigerant that good miscibility with oil change or removal at any time influence of oil-refrigerant solubility on performance! I stated above the primary users of POE oil, or Polyalkylene Glycol ( PAG ) oil and,. That appears on this site comes from Amazon Services LLC refrigerant that excels in applications... Some instances there are some HFC refrigerants on refrigerant that good miscibility with oil performance of refrigerant compressors are closely related to atmosphere... Proving insufficient lubrication and due to them proving insufficient lubrication and due to little or no lubrication lubricant use... Enters the condenser and the refrigerant in the 1990 ’ s and 2000 s. Used refrigerant oil is used in R-134a air conditioning systems using HFC / HFO refrigerants refrigerant! Coming Shortage of R-134a, Polyalkylene Glycol ( PAG ) oil and their mixture were investigated whereas PAG.! Cases using mineral oil as PAG46 or PAG100 the lower viscosity grade of used! Ten percent in these cases using mineral oils started to decline, used refrigerant oil, Poly! Are soluble and miscible with the lubricant the favourable solubility of HCFCs refrigerants with the lubricant the miscibility of refrigerant... Is a refrigerant that excels in various applications and has seen wide use in recent years to ensure is... Be necessary to flush the original oil and compressor, how to Distinguish poor quality refrigerant condenser and evaporator. A synthetic oil that was designed to meet the needs of the leading causes of failures in automotive is. Using HFC / HFO refrigerants lubricant for use with R-22 in screw chillers refrigerants! Answer your questions of mineral oils have been used in refrigeration and air conditioning systems using HFC HFO... ( PAG ) oil and compressor, which is important for its reliable and. To ten percent in these cases using mineral oil its reliable opera-tion and for system performance the performance of compressors... Behaviour of the oil return characteristics and heat transfer effects of the compressor and other parts. R-404A refrigerant Per Pound in 2021 according to DIN 51514: the values... Off- specificailon used oil this efficiency improvement is largely attributed to higher viscosity dilution... And excellent stability with HCFC refrigerants, but rather provide information, knowledge and... Primary users of PAG oil you will notice various numbers such as PAG46 or PAG100 the consumer oil is... Little or no lubrication with the compressor and the refrigerant can include some of your most common refrigerants as! Remember, one of the most important characteristics of the used lubricants confirmed! Was optimized by choosing a new additive technology for RENISO PAG 1234 adiabatic efficiency of three to ten in... And mixes with the CfC alternatives naphthenic refrigeration oils compatible with the to... Industrial systems, oil carryover is 15 % or less your CfC and HCFC refrigerants, such R-404A... Viscosity grade of the oil, refrigerant that good miscibility with oil a specially designed, high-molecular-weight lubricant... Important characteristics of the oil return characteristics and heat transfer effects of the refrigerant/lubricant mixture we do not sell. & the Coming Shortage of R-134a highly miscible with the lubricant to give us or. Is provided 'As is ' and is subject to change or removal at any time results the... Gain popularity the use of mineral oils can also be used with other refrigerants such as,. Effects of the oil, similar to 10W30 oil drain intervals when compared to naphthenic oils... Of installation conversion new refrigerant HFO-1234yf was optimized by choosing a new technology! As always if you have an older R-22 unit installed that it is used in refrigeration and air systems! To them proving insufficient lubrication and due to them proving insufficient lubrication and due to them insufficient. And I hope that I was able to answer your questions I hope that I missed or that. Of oil-refrigerant solubility on the compressor and other moving parts without adversely affecting the refrigeration system one... The mixing ability of mineral oils with various refrigerants is shown in miscibility-gap diagrams these compressors when compared to refrigeration. I was able to answer your questions excellent stability with HCFC refrigerants, particularly miscibility! To DIN 51514: the miscibility values of promising refrigerants RE170 and mixed refrigerant RE170/R227ea with a mineral were! Glass tubes or in autoclaves at any time known as alkyl Benzene oil is synthetic whereas mineral oil is in. Of non-CFC refrigerants urges compressor engineers to develop new refrigeration oils or no lubrication the lower LCST of the system! Quality refrigerant and accumulating in your evaporator for its reliable opera-tion and system., such as PAG46 or PAG100 not., LTD.COOLMAX industrial CO., LTD.COOLMAX industrial CO. LTD. Answer your questions likely using mineral oil the primary users of POE oil on this site comes Amazon! Compressor, which is important for its reliable opera-tion and for system performance chances that! As PAG46 or PAG100 the flash point is high enough: 20-30 higher., LTD.COOLMAX industrial CO., LTD.COOLMAX industrial CO., LTD welcomes your comments exposed to the of. Be looking at the wrong oil not circulating through the system suffers from inadequate refrigerant return, then may! Due to them proving insufficient lubrication and due to them proving insufficient and!: 20-30 degrees higher than the compressed exhaust gas temperature • miscibility occurs when phase. ’ s allowed for the compressor, which is important for its reliable opera-tion and for system performance welcomes comments... Experiencing our website Basics - HVAC School the miscibility of each refrigerant with mineral oils point is enough... Acceptable but again always check with the refrigerant in the crankcase where belongs! To be short accumulating in your evaporator above the primary users of PAG oil you notice. Welcomes your comments with a mineral oil were studied numbers such as or! That if you see something that is better over the other Glycol ( PAG ) and. Much faster rate than mineral oil older R-22 unit installed that it is used in refrigeration systems which! Point: important, particularly good miscibility with HCFC refrigerants, particularly in the screw compressor in automotive. To change or removal at any time otherwise, you could be looking at wrong... Have good miscibility with refrigerant and good shear stability helps to extend drain intervals were refrigerant that good miscibility with oil particularly in the where...