In an automotive engine, motor oil stays in the crankcase where it belongs. For air conditioning and refrigeration systems, new synthetic lubricants having miscibility with HFC refrigerants, similar to that of mineral oils with CFCs, have been developed. Immiscible Suva R-134A (HFC) / BVA 3 (MO). Mineral oils typically used with R-22 has relativity low Miscibility with R-410A. The miscibility of refrigerants with mineral oils is very important in the process of refrigerant substitution. Fundamentals of Petroleum and Petrochemical Engineering Oil requirements: Good refrigerant miscibility properties Reliable lubrication properties High stability in combination with HFO-1234yf Oil solution: POE or PAG …? If possible, the refrigerant must be odorless, but easy detection in the air is desirable. Very good miscibility behavior with refrigerants allowing a good oil return (down to –60 °C at the evaporator). BVA RPOE Series is miscible with all HFC, HCFC, CFC and blends. 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. D. Be compatible with the materials used in the shaft seal. V. CONCLUSIONS Solubility and low temperature miscibility of refrigerants … Have a high dielectric strength . POE has good miscibility with mineral oils, whereas PAG oils have poor miscibility. A summary of most common refrigerants and their oil compatibility is detailed below. For the miscibility of mixed refrigerants, it was found that the mixtures of R227ea/RE170 and R1234ze(E)/RE170 present good miscible performances with mineral oils. 26 Full PDFs related to this paper. C. Be extremely hygroscopic. refrigerant gaz r 1234 yf refrigerant gas r1234yf. 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. Depending on the type of compressor different kinds of bearings and bearing arrangements are chosen. Lubrication Synthetic, polyalphaolefin-based refrigeration oils are described as not miscible with CO 2. This study tries to identify influence of oil-refrigerant solubility on the performance of refrigerant compressors. CO2-oil minimum miscibility pressure (MMP) is a key parameter in CO2 enhanced oil recovery (CO2-EOR) process. It has a very good miscibility with refrigerants which have only limited miscibility with conventional mineral oils. 1, R22 refrigerant compressor usually use mineral oil; R410A refrigerant compressor with organic synthesis oil commonly, common POE ( Ethers) 通过( Ester) 。 R410A cannot miscibility with mineral oil, R410A air conditioning system with mineral oil, R22 with) , which may lead to freezing oil degradation, generate metal salt hydrolysis. Data on the miscibility ofR‐32/125 and R‐125/143a with polyol ester lubricants are presented in this paper. Desirable chemical and safety properties comprise chemical stability within the working conditions in the refrigeration unit in the presence of used materials and lubricating oil, non-flammability, non-toxicity, good miscibility with oil. The authors will review the mechanical issues in miscible vs non-miscible naphthenic hydrocarbon oil-based lubricants. 10. Suitable for the lubrication of highly stressed refrigerant compressors due to excellent stability Shell Clavus Oil SD 22-12 Semi-synthetic Refrigerator Compressor Lubricant Shell Clavus SD 22-12 is a special duty refrigerator compressor lubricant based on a blend of alkylated benzene and naphthenic mineral oil. While HFC refrigerants may have desirable physical properties that make them appropriate long term refrigerant alternates, they lack miscibility with naphthenic mineral oils traditionally used as refrigeration compressor lubricants. This program was aimed at understanding refrigerant/lubricant circulation issues, developing test data and approximate models that can predict operating regimes where good oil management can be assured. R ch e. structur POE chem . The series was specifically de-veloped for HFC refrigerants. READ PAPER. structure PAG . It is essential that the oil in a hermetic compressor: A. Due to their good miscibility with refrigerants they are the best choice for applications with HFC/FC such as R134a, R404A, R407C. The miscibility values of promising refrigerants RE170 and mixed refrigerant RE170/R227ea with a mineral oil were studied. Errecom POE Oil – Lubricants for Air Conditioning & Refrigeration Systems. Complete R-12(CFC) / BVA 3 (MO) R-134a (HFC) and RPOE LT 32 (POE) Partial R-22 (HCFC) / BVA 4 (MO) R-134A (HFC) / RPOE 68 (POE). POE are synthetic lubricants with high chemical and thermal stability. Utilization of non-CFC refrigerants urges compressor engineers to develop new refrigeration oils compatible with the CfC alternatives. POE oils is also more hydrolytic stable than PAG oils. As can be seen from Fig. viscosity grade of the oil, the lower LCST of the refrigerant/lubricant mixture. Adequate miscibility, many believe, provides oil return to the compressor. Alkyl Benzene lubricant would be most commonly associated with: A. R12 in an older style domestic refrigerator. POE are synthetic lubricants with high chemical and thermal stability. Older CFC and HCFC refrigerants tended to use Mineral Oil (MO) and Alkyl Benzene (AB) oils. Furthermore, a theoretical method of a new evaluation index was proposed to predict the miscibility of refrigerants with mineral oils with satisfactory accuracy. B. PAG oils and CO 2 only allow limited miscibility (larger miscibility gap with CO 2). RENISO - Refrigeration oils based on Mineral Oil, PAG, PAO or POE. General properties of refrigerants and requirements. 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 In the field of lubricants and lubrication technology, refrigeration oils are of particular importance. POE oils are also compatible with hydrocarbons such as R290 propane and R1270 propylene. • Share refrigerant/lubricant property data and trends including miscibility, solubility and viscosity date for low GWP refrigerants with lubricants • Describe results for thermodynamic cycle modeling and system performance testing of several low GWP refrigerants in various applications. Chemical properties of refrigerant. POE oil with good miscibility with all refrigerants tested EXV for expansion control. One of the most important characteristics of the oil is miscibility with refrigerant and good miscibility is usually acceptable. Both the considered lubricant oils have of the four refrigerants in mixture with Fomblin lubricant shown a complete miscibility in mixtures with refrigerant are reported. Have a low miscibility with the system refrigerant. FUCHS RENISO refrigeration oils for virtually all refrigerants e.g. POE oil POE Lubricants for Air Conditioning & Refrigeration Systems. Miscibility is the ability of an oil to dissolve uniformly in refrigerant in either the liquid or vapor state. POE oils gener-ally offer good CO 2 miscibility. POE oils are also compatible with hydrocarbons such as R290 propane and R1270 propylene. The long lifetime expectations of refrigerant compressors are closely related to the high quality requirements of the used lubricants. Immiscible is when the oil and refrigerant do not mix and stay in two phases. 5, the LCSTs for the mixtures of R407C with the lubricants with the viscosity grades 32 and 220 differ by 30-45 °С. by:Arkool 2021-01-14. a, refrigerant thermodynamic properties of . Due to their good miscibility with refrigerants they are the best choice for applications with HFC/FC such as R134a, R404A, R407C. Modern HFC and HFO refrigerants tend to use Polyolester (POE) oils, although some HFC blends specifically designed as "drop-in" retrofit gases for CFCs and HCFCs may have some tolerance to MO and AB oils. Oil is used in refrigeration systems to lubricate compressor bearings and other moving parts. 11. The oils have good miscibility with R-12 and superior stability. 1234yf refrigerant gas. refrigerant and oil, the new oil must be miscible with the old oil in the system. HFC-134a Good Price pure and safety car air conditioner gas refrigerant 134a 1000g. CompStar SK Series products are also recommended for use with Drop-In refrigerants (R402A/B, R401A/B, etc.). Presently, synthetic polyol esters have been selected for use with HFC refrigerants, such as R-134a, which are considered appropriate alternatives to CFCs. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) CO2, NH3, R22, R1234yf or R134a. The properties of the oil selected must be suitable for this purpose. 10.9kg cylinder refrigerant gas r410a . In some instances there are some HFC refrigerants and compressors out there that were designed as drop-in replacements for older HCFC units. www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. - Toxicity - Leak detection - Flammability - Miscibility with oil - Effect on foodstuff - Stability Physical properties of refrigerant. 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