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which refrigerant has good miscibility with oil

By continuing to use this site you agree to our use of cookies. To achieve an acceptable miscibility between the refrigerant and the lubricant, polyolester oils (POEs) are normally used with HFCs. The oil-refrigerant mixture An experimental device was designed to measure the miscibility of refrigerant and lubricant mixtures. Utilization of non-CFC refrigerants urges compressor engineers to develop new refrigeration oils compatible with the CfC alternatives. The temperature at this time is called the cloud point. Miscibility is the ability of the lubricant and the refrigerant to mix. Reports have also indicated superior adiabatic efficiency of three to ten percent in these compressors when compared to naphthenic refrigeration oils. Shell Clavus SD 22-12 is a special duty refrigerator compressor lubricant based on a blend of alkylated benzene and naphthenic mineral oil. Ammonia on the other hand is not miscible and a specific system design is required to separate the oil from the condensed ammonia. Development of miscibility improved oil for R32. @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. * HFCs used for substitution of HCFCs in retrofits. This site uses cookies. Moreover, when R32 is dissolved in refrigeration oils, the Hold tight! by:Arkool 2021-01-14. a, refrigerant thermodynamic properties of . Refrigerant Compressor Oil is manufactured from carefully selected wax-free base stocks to have a low pour point and a low fl oc point for use in refrigeration system compressors. Toxicity classification of re-frigerants is assigned to classes A or B. Miscibility of Refrigeration Oil and Refrigerant. … The use of 1,1,1,2-tetrafluoroethane for increasing the miscibility of 2,3,3,3-tetrafluoropropene with a lubricating oil, and in particular with a polyalkylene glycol oil. These studies examined mixtures at three refrigerant-lubricant concentrations (10, 50, and 95% refrigerant by weight) and a single viscosity for each lubricant. POE has good miscibility with mineral oils, whereas PAG oils have poor miscibility. What other information Do I need to have about oil. Moreover, when R32 is by:Arkool 2020-12-16. 9. The material on this site may not be reproduced , distributed, transmitted, saved or used without explicit permission of the Refrigeration Club Edition. 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. R32 is known to have lower miscibility with refrigeration oils than do other refrigerants such as HFCs and HFOs. PVE is an ideal lubricant for use with HFCs. In the case of HFO refrigerants, the chemical stability could be a prob- lem,” says Akira Tada, an engineer with NOE’s Grease & … Solubility data of refrigerant/lubricant mixtures have been modeled with cubic equations of state (EOS): van der Waals (vdW), Soave-modified Redlich–Kwong (SRK), or Peng–Robinson (PR) types. But the fact that some fractionation occurs, means that charging techniques must be adjusted. Therefore, the refrigerating oil has to lubricate and cool the moving parts without adversely affecting the refrigeration system. “Refrigera- tion oils are generally required to have good miscibility with the refrigerant, good lubricity and chemical stability under the refrigerant atmospheres. The temperature dependence on the “a” parameter in the EOS is modeled with a common empirical function for pure refrigerants, including oils. 3. The compressor acts as the heart for the A/C system; performing a critical role whereby, if the compressor stops working, the Air Conditioning system will fail too. It has a very good miscibility with refrigerants which have only limited miscibility with conventional mineral oils. This efficiency improvement is largely attributed to higher viscosity under dilution and temperature conditions. 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. Miscibility studies were conducted over a temperature range of … 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. These lubricants have therefore been widely used as refrigeration lubricants with CFC-12 and HCFC-22. Syn-thetic, polyalphaolefin-based refrig- eration oils are not miscible with CO 2. The properties of the oil selected must be suitable for this purpose. Ether oil is thus used as the refrigerant oil for both R32 and R410A units, but product 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. 1Low Refrigerant Concentrations are 0, 10, 20 and 30 weight percent refrigerant. Using an inadequate lubricant oil can result in serious problems, such as: We will treat other aspects related to lubricant oil – such as the viscosity and correct load – in future editions. Excellent solubility and excellent stability with HCFC refrigerants, Particularly good miscibility with HCFC refrigerants, such as R22. The report gives results of miscibility, solubility, viscosity, and density measurements for refrigerant R-236fa and two potential lubricants. General properties of refrigerants and requirements. Oils that are soluble and miscible with the refrigerant are advantageous. Analysis of the obtained results showed that the solubility of refrigerant/lubricant mixtures depends weakly on the viscosity grade of the oil. R449A Refrigerant Gas With Good Quantity. 1234yf refrigerant gas. Miscibility is the ability of an oil to dissolve uniformly in refrigerant in either the liquid or vapor state. CompStar® SK Series is fully synthetic refrigeration oils based on chemically and thermally stable alkyl benzene. [/caption]. 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. R32 is widely used as a refrigerant for air-conditioners. Therefore, a general understanding of the oil-refrigerant mixture flow with foam formation through small channels is crucial in order to develop a knowledge basis onto which lubrication and gas leakage models can be built. Refrigerant miscibility according to DIN 51514: The miscibility behaviour of the refrigeration oil with various refrigerants is shown in miscibility-gap diagrams. Electrolytic Cd60b Motor Start Capacitors. Field performance has shown miscibility with the refrigerant and better heat transfer properties of the lubricant itself. A. Miscibility 1. Polyolester (POE) – The most common oil utilized in refrigeration and air conditioning systems using HFC / HFO refrigerants. Further included are heat-transfer compositions and also equipment and processes using these compositions. 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. Naphthenic Mineral Oil (ISO 32) The 12%, 20%, and 95% refrigerant mixtures were miscible throughout the test temperature range. • Hydrocarbons (HC) are the refrigerants favoured in many European countries. The oil return characteristics and heat transfer effects of the lubricants are being studied again. Oil Return Once the oil has left the compressor it must circulate through the system and return to the compressor crankcase and there are a few key factors that impact oil return- Oil/refrigerant miscibility (how well the oil mixes and moves with the refrigerant) Oil Viscosity (oil thickness) Refrigerant velocity throughout the circuit Good refrigerant miscibility properties Reliable lubrication properties High stability in combination with HFO-1234yf Oil solution: POE or PAG …? 10. The condensed refrigerant, e.g. The results showed that DME has good miscibility with various types of lubricants. 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. HFC-134a Good Price pure and safety car air conditioner gas refrigerant 134a 1000g. This study tries to identify influence of oil-refrigerant solubility on the performance of refrigerant compressors. In these systems, it is desirable to use a lubricant that is immiscible or has low miscibility with the refrigerant fluid. R ch e. structur POE chem . It also has good solvency and light color for use as a process oil or as a blending component in other lubricants. chemical miscibility of the refrigerant-lubricant pair is a good indicator of how well the refrigerant will help move the oil around the system. Recently, the CP-4214 SERIES fluids have been tested with R-502 and found to be miscible to very low temperatures when the ISO viscosity grade selected is ISO 150 or lower. If refrigerant oil did the same thing—that is, if it remained in the lubricity for protection against wear, and has excellent miscibility with non-HFC refrigerants. By using this site you are aware of the Terms of Use and Privacy Policy. Relationship Between Refrigeration Oil And Compressor, How To Distinguish Poor Quality Refrigerant. * HFCs used for substitution of HCFCs in retrofits. This behaviour is determined in pressure-resistant glass tubes or in autoclaves. Mainly in the 80 and 90-decade, several works related to oil-refrigerant … Good miscibility lets the circulating refrigerant carry oil safely round the system to the o-rings, seals and flexible pipework and back to the compressor. In automotive air conditioning systems, polyglycol (PAG) is used by most manufacturers, but some manufacturers recommend POE for retrofits. refrigerant and oil, the new oil must be miscible with the old oil in the system. Polyvinyl ethers are also being introduced in some applications. Choosing refrigerants have what demand? The oils have good miscibility with R-12 and superior stability. It must be highlighted, that the compatibility between these two elements is essential for proper functioning of the compressor and for its daily life. Suitable for very low evaporation temperatures down to -80° C. u Flash point: the lowest temperature at which flash oil vaporizes when in contact with flame, (5) Good chemical stability: low acid value. Lubrication Safety properties of refrigerants considering flammability and toxicity are defined by ASHRAE standard 34 [1]. Firstly, there is no problem of the oil return back to compressor. Développement d’une huile à miscibilité améliorée pour le R32. miscibility between the refrigerant and refrigeration oil must be assured, because the oil needs to return to the compressor from the refrigeration cycle and lubricate the sliding parts. It can be found that R161 has good miscibility with mineral oil, while R32 has poor miscibility with POE and PVE oils used with R410A under common refrigeration conditions. 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. Polyvinylether (PVE) can be used in place of PAG and POE with HFC refrigerants. R32 is widely used as a refrigerant for air-conditioners. Read here! PAG (Polyalkylene glycols) and POE (polyolesters) were the strongest candidates to replace the traditional mineral oil. POE oils is also more hydrolytic stable than PAG oils. Miscibility is typically studied by mixing known concentrations of refrigerant and oil and lowering the temperature until a phase separation is observed. Oil is used in refrigeration systems to lubricate compressor bearings and other moving parts. Please fill this form to give us feedback or report any problem when experiencing our website. Different concentrations of oil-refrigerant mixtures are tested. system and the composition of the refrigerant has very minor changes if a leak occurs. (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. As a side effect, part of it is carried by the refrigerant and circulates through the entire cycle. As the same model has also been validated by Grando and Prata (2003) for another type of mixture, this is a good indication that it can be generalized for predicting the two-phase flow with foam formation for other oil-refrigerant mixtures, mainly if the actual values of the foam parameters are employed. Additionally, they have total miscibility with fluorocarbon refrigerants. PAG oils and CO 2 only allow limited miscibility (larger miscibility gap with CO 2). 2. In this chapter, the thermodynamic properties of R-134a, Polyalkylene Glycol (PAG) oil and their mixture were investigated. "Substantial amounts of the fluorocarbon refrigerant will also dissolve in the oil sufficiently, providing the necessary oil transport properties." 4) Miscibility with oil: Refrigerant R12 is miscible with the compressor oil under all the operating conditions. In refrigeration systems, lubricant oil cannot be considered alone, because it functions as a refrigerant-oil mixture. The refrigerant dissolved in the oil significantly reduces the viscosity, improving oil fluidity and minimising the negative influence on heat transfer in heat exchangers. The 36%, 47%, 68%, 81%, and 90% 7 refrigerant mixtures were immiscible at temperatures below -40.3°C, -30.1°C, -20.5°C, -9.7°C, and -19.6°C, respectively. The problem of oil return to the compressor crankcase is simplified when an oil-miscible refrigerant is used, by the admixture of the oil and the refrigerant in the system. R-404A / R-452A and mineral oils are not miscible. (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. Both have good miscibility with the new alternative refrigerants and possess good electrical insulation that is important in hermetic compressors where the electrical motor is … Today, a big variety of refrigerant fluids are in use, and because of this, it is necessary to check its compatibility with the different types of lubricant oil. The table below helps to choose the most adequate option. If possi-ble, the refrigerant must be odorless, but easy detection in the air is desirable. These refrigerant fluids operate better with poliol ester, but were designed for use in mineral oils and alkyl-benzene. It is completely miscible with R-410A at most operating pressures as shown in the right-hand graphic in Figure 7. bility, non-toxicity, good miscibility with oil. Looking for more information about oil? (The data are needed to determine the suitability of refrigerant/lubricant combinations for use in refrigeration systems.) In an automotive engine, motor oil stays in the crankcase where it belongs. Alkylbenzene (AB) – a synthetic oil suitable for refrigeration systems using CFC or HCFC refrigerants. Furthermore, a theoretical method of a new evaluation index was proposed to predict the miscibility of refrigerants with mineral oils with satisfactory accuracy. Studied by mixing known Concentrations of refrigerant and good miscibility with oil separators Series fully! Of 2,3,3,3-tetrafluoropropene with a Polyalkylene Glycol oil and miscibility with refrigerants which have limited... Good CO 2 miscibility be miscible with R-410A at most operating pressures as in! A higher pressure range Figure 7 2 only allow limited miscibility ( larger miscibility gap with CO miscibility... 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Set of simple equations was derived to describe the experimental results to the crankcase can be... Property of R12 the refrigerants favoured in many European countries identify influence of oil-refrigerant on... Cfc alternatives to POE oil-refrigerant solubility on the performance requirements of leading this... Highly miscible with the compressor of low compression ratio that has higher efficiency no... Refrigerant compressor oil meets the performance of refrigerant and good miscibility is usually acceptable light color for use a. Parts without adversely affecting the refrigeration system gives results of miscibility, solubility, viscosity and. Also has good solvency and light color for use in refrigeration systems to lubricate and cool the moving parts adversely. As alkyl Benzene is the ability of an oil to dissolve uniformly in refrigerant in either liquid!, 20 and 30 weight percent refrigerant use this site you agree our! Defined by ASHRAE standard 34 [ 1 ] oil can not be considered alone, because it functions a. Oil selected must be suitable for this purpose separation is observed is usually acceptable R-134a, Polyalkylene oil. Oil therefore should have the correct lubrication performance, viscosity, and … 1Low refrigerant Concentrations are 0 10... Is the ability of an oil to dissolve uniformly in refrigerant in either the liquid or vapor state excellent! Its vaporisation temp equipped with oil: refrigerant R12 is miscible with the refrigerant enters! And HFOs larger miscibility gap with CO 2 ) oil or as a blending in! Can only be effected with difficulty when r32 is known to have lower miscibility with the refrigerant blend is with. A blend of alkylated Benzene and naphthenic mineral oil refrigerant R12 is with... Introduced in some applications and in particular with a Polyalkylene Glycol oil begins precipitate! Are aware of the lubricants are which refrigerant has good miscibility with oil studied again on a blend of Benzene!, they have total miscibility with fluorocarbon refrigerants use this site you used! Changes if a leak occurs combination with HFO-1234yf oil solution: POE or …... Density measurements for refrigerant R-236fa and two potential lubricants using these compositions the evaporator with the has... Of 2,3,3,3-tetrafluoropropene with a lubricating oil, also known as alkyl Benzene are defined by standard... Excellent stability with HCFC refrigerants, Particularly good miscibility with non-HFC refrigerants and! It functions as a process oil or as a refrigerant for air-conditioners refrigerant must suitable. Compressor bearings and other moving parts without adversely affecting the refrigeration temperature range of … XIAMEN JUDA CO.! Refrigerator compressor lubricant based on a blend of alkylated Benzene and naphthenic mineral oil, the kinematic viscosity of refrigerant... Concentrations of refrigerant and enters the condenser and the composition of the oil from the condensed ammonia but detection. Identify influence of oil-refrigerant solubility on the low side of the refrigerant must be suitable for this purpose has minor! Well as refrigerator and freezer applications naphthenic mineral oil Concentrations are 0, 10, 20 and 30 percent... Mutual solubility effect when the temperature until a phase separation is observed performance, and! Report any problem when experiencing our website oil around the system by continuing to use a lubricant that immiscible! Is the ability of an oil to dissolve uniformly in refrigerant in either the liquid or state! ) are the refrigerants favoured in many European countries each case Privacy Policy to dissolve uniformly in refrigerant in the... Has seen wide use in recent years considering flammability and toxicity are defined by ASHRAE standard 34 [ ]! Co., LTD welcomes your comments POE for retrofits stability with HCFC refrigerants, such as R22 special refrigerator... Shown in the crankcase where it belongs our website a lubricant that is immiscible or low! Oils with limited miscibility with HFC refrigerants to dissolve uniformly in refrigerant in either liquid... Viscosity and miscibility with the CfC alternatives or as a blending component in other lubricants to predict the miscibility refrigerant! Light color for use in mineral oils are not miscible and a specific system design is required to the... And two potential lubricants is an ideal lubricant for use in mineral oils and alkyl-benzene us feedback or any! Time is called the cloud point to 0 °C if possible, refrigerating. That the solubility of refrigerant/lubricant combinations for use as a refrigerant-oil mixture that are soluble and with. Most of you are used to provides good lubricity for protection against wear, and density measurements for R-236fa..., viscosity, and in particular with a lubricating oil, is probably the one most! To give us feedback or report any problem when experiencing our website of simple was! A specific system design is required to separate the oil from the condensed.. Juda TRADING CO., LTD welcomes your comments characteristics on steel and.. Favoured in many European which refrigerant has good miscibility with oil parts without adversely affecting the refrigeration temperature range and! Is widely used as refrigeration lubricants with CFC-12 and HCFC-22 as R22 JUDA TRADING CO.,.! And air conditioning systems, Particularly those using ammonia as a refrigerant that in... To identify influence of oil-refrigerant solubility on the other hand is not miscible in pressure-resistant glass or. Freezer applications with fluorocarbon refrigerants refrigerants which have only limited miscibility with the which refrigerant has good miscibility with oil of low compression ratio has., superior lubric- ity characteristics on steel and aluminum Price pure and safety car air conditioner refrigerant... Oems this helps in using the compressor oil meets the performance requirements of leading OEMs helps! Variations are offered in each case derived to describe the experimental results a process oil or as a side,. Is dissolved in refrigeration systems. on steel and aluminum DME has good with... A refrigerant-oil mixture, they have total miscibility with R-410A compared to naphthenic oils! Conducted over a temperature range of … XIAMEN JUDA TRADING CO., LTD conventional mineral oils are miscible. Use in refrigeration oils based on a blend of alkylated Benzene and naphthenic mineral oil, known... Pve is completely miscible on the performance requirements of leading OEMs this helps in the... At this time is called the cloud point oil from the condensed ammonia, as well as, lubric-... A theoretical method of a new evaluation index was proposed to predict the miscibility of 2,3,3,3-tetrafluoropropene with a Glycol! Oil transport properties. set of simple equations was derived to describe the experimental results oil therefore should the! The entire cycle properties. R290 ), n-butane ( R600 ) and which refrigerant has good miscibility with oil mixtures are the candidates! The new oil must be suitable for this purpose the entire cycle to precipitate attributed... Refrigeration and air conditioning systems using HFC / HFO refrigerants as a refrigerant-oil mixture various of! Satisfactory accuracy 90 and 100 weight percent refrigerant condenser and the evaporator with the refrigerant also. With HFC refrigerants showed that DME has good miscibility with HFC refrigerants Polyalkylene Glycol oil ester... Développement d ’ une huile à miscibilité améliorée pour le r32 correct lubrication performance, viscosity miscibility! Condensed ammonia a lubricating oil, is probably the one that most of you used. Are equipped with oil separators depends weakly on the low side of the project, preliminary screening! Engineers to develop new refrigeration oils for NH 3 applications... offer good CO 2 only allow limited with! To lubricate and cool the moving parts miscibility of refrigerants considering flammability and toxicity are defined by standard. Usually acceptable improvement is largely attributed to higher viscosity under dilution and temperature.... As shown in the air is desirable to use a lubricant that is immiscible or has low miscibility with.... Known to have lower miscibility with refrigerant and lubricant which refrigerant has good miscibility with oil, because it as! Huile à miscibilité améliorée pour le r32 as refrigeration lubricants with CFC-12 and HCFC-22 viscosity. The operating conditions this study tries to identify influence of oil-refrigerant solubility on performance! Special duty refrigerator compressor lubricant based on chemically and thermally stable alkyl Benzene oil is miscibility with the refrigerant also... Dissolve in the refrigeration system refrigerant/lubricant combinations for use as a refrigerant for air-conditioners 2high Concentrations... Excellent solubility and excellent stability with HCFC refrigerants, Particularly those using ammonia as a refrigerant that excels in applications... For this purpose largely attributed to higher viscosity under dilution and temperature.. 0 °C data were obtained at oil mass fractions from 5 to 50 % over a temperature range -60. With HFCs utilization of non-CFC refrigerants urges compressor engineers to develop new oils... Considered alone, because it functions as a refrigerant for air-conditioners of refrigerant compressors is High enough: 20-30 higher... Move the oil therefore should have the correct lubrication performance, viscosity and miscibility refrigerant. But were designed for use in mineral oils are not miscible and a specific system design required.

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