In the field of lubricants and lubrication technology, refrigeration oils are of particular importance. 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. POE oils are also compatible with hydrocarbons such as R290 propane and R1270 propylene. refrigerant and oil, the new oil must be miscible with the old oil in the system. PAG oils and CO 2 only allow limited miscibility (larger miscibility gap with CO 2). ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) 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. Oil is used in refrigeration systems to lubricate compressor bearings and other moving parts. 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. FUCHS RENISO refrigeration oils for virtually all refrigerants e.g. Have a low miscibility with the system refrigerant. Fundamentals of Petroleum and Petrochemical Engineering CO2, NH3, R22, R1234yf or R134a. 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. A dynamic test facility was constructed and used to examine oil return under varying system operating conditions. POE oils are also compatible with hydrocarbons such as R290 propane and R1270 propylene. In an automotive engine, motor oil stays in the crankcase where it belongs. The series was specifically de-veloped for HFC refrigerants. Immiscible Suva R-134A (HFC) / BVA 3 (MO). Miscibility is the ability of an oil to dissolve uniformly in refrigerant in either the liquid or vapor state. 26 Full PDFs related to this paper. HFC-134a Good Price pure and safety car air conditioner gas refrigerant 134a 1000g. R ch e. structur POE chem . D. Be compatible with the materials used in the shaft seal. 1234yf refrigerant gas. The authors will review the mechanical issues in miscible vs non-miscible naphthenic hydrocarbon oil-based lubricants. In some instances there are some HFC refrigerants and compressors out there that were designed as drop-in replacements for older HCFC units. If possible, the refrigerant must be odorless, but easy detection in the air is desirable. Older CFC and HCFC refrigerants tended to use Mineral Oil (MO) and Alkyl Benzene (AB) oils. CompStar SK Series products are also recommended for use with Drop-In refrigerants (R402A/B, R401A/B, etc.). CO2-oil minimum miscibility pressure (MMP) is a key parameter in CO2 enhanced oil recovery (CO2-EOR) process. Data on the miscibility ofR‐32/125 and R‐125/143a with polyol ester lubricants are presented in this paper. Very good miscibility behavior with refrigerants allowing a good oil return (down to –60 °C at the evaporator). 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 %. POE oils is also more hydrolytic stable than PAG oils. Errecom POE Oil – Lubricants for Air Conditioning & Refrigeration Systems. B. Presently, synthetic polyol esters have been selected for use with HFC refrigerants, such as R-134a, which are considered appropriate alternatives to CFCs. 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. It has a very good miscibility with refrigerants which have only limited miscibility with conventional mineral oils. 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. 10. Adequate miscibility, many believe, provides oil return to the compressor. Synthetic, polyalphaolefin-based refrigeration oils are described as not miscible with CO 2. RENISO - Refrigeration oils based on Mineral Oil, PAG, PAO or POE. POE oils gener-ally offer good CO 2 miscibility. - Toxicity - Leak detection - Flammability - Miscibility with oil - Effect on foodstuff - Stability Physical properties of refrigerant. This efficiency improvement is largely attributed to higher viscosity under dilution and temperature conditions. POE are synthetic lubricants with high chemical and thermal stability. The miscibility of refrigerants with mineral oils is very important in the process of refrigerant substitution. General properties of refrigerants and requirements. The oils have good miscibility with R-12 and superior stability. Immiscible is when the oil and refrigerant do not mix and stay in two phases. refrigerant gaz r 1234 yf refrigerant gas r1234yf. POE has good miscibility with mineral oils, whereas PAG oils have poor miscibility. POE are synthetic lubricants with high chemical and thermal stability. Lubrication Depending on the type of compressor different kinds of bearings and bearing arrangements are chosen. 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. The long lifetime expectations of refrigerant compressors are closely related to the high quality requirements of the used lubricants. This study tries to identify influence of oil-refrigerant solubility on the performance of refrigerant compressors. The miscibility values of promising refrigerants RE170 and mixed refrigerant RE170/R227ea with a mineral oil were studied. 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