One of the most important characteristics of the oil is miscibility with refrigerant and good miscibility is usually acceptable. Due to their good miscibility with refrigerants they are the best choice for applications with HFC/FC such as R134a, R404A, R407C. Errecom POE Oil – Lubricants for Air Conditioning & Refrigeration Systems. 10. This efficiency improvement is largely attributed to higher viscosity under dilution and temperature conditions. POE oils are also compatible with hydrocarbons such as R290 propane and R1270 propylene. READ PAPER. The authors will review the mechanical issues in miscible vs non-miscible naphthenic hydrocarbon oil-based 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. 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 %. It has a very good miscibility with refrigerants which have only limited miscibility with conventional mineral oils. Have a high dielectric strength . Reports have also indicated superior adiabatic efficiency of three to ten percent in these compressors when compared to naphthenic refrigeration oils. Furthermore, a theoretical method of a new evaluation index was proposed to predict the miscibility of refrigerants with mineral oils with satisfactory accuracy. POE are synthetic lubricants with high chemical and thermal stability. structure PAG . refrigerant and oil, the new oil must be miscible with the old oil in the system. Synthetic, polyalphaolefin-based refrigeration oils are described as not miscible with CO 2. 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. If refrigerant oil did the same thing—that is, if it remained in the As can be seen from Fig. CompStar SK Series products are also recommended for use with Drop-In refrigerants (R402A/B, R401A/B, etc.). This study tries to identify influence of oil-refrigerant solubility on the performance of refrigerant compressors. The series was specifically de-veloped for HFC refrigerants. POE oils is also more hydrolytic stable than PAG oils. 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. Adequate miscibility, many believe, provides oil return to the compressor. R ch e. structur POE chem . Oil requirements: Good refrigerant miscibility properties Reliable lubrication properties High stability in combination with HFO-1234yf Oil solution: POE or PAG …? 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. CO2, NH3, R22, R1234yf or R134a. Utilization of non-CFC refrigerants urges compressor engineers to develop new refrigeration oils compatible with the CfC alternatives. If possible, the refrigerant must be odorless, but easy detection in the air is desirable. In some instances there are some HFC refrigerants and compressors out there that were designed as drop-in replacements for older HCFC units. POE oil with good miscibility with all refrigerants tested EXV for expansion control. by：Arkool 2021-01-14. a, refrigerant thermodynamic properties of . The miscibility values of promising refrigerants RE170 and mixed refrigerant RE170/R227ea with a mineral oil were studied. General properties of refrigerants and requirements. HFC-134a Good Price pure and safety car air conditioner gas refrigerant 134a 1000g. - Toxicity - Leak detection - Flammability - Miscibility with oil - Effect on foodstuff - Stability Physical properties of refrigerant. 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. 11. Data on the miscibility ofR‐32/125 and R‐125/143a with polyol ester lubricants are presented in this paper. Alkyl Benzene lubricant would be most commonly associated with: A. R12 in an older style domestic refrigerator. Suitable for the lubrication of highly stressed refrigerant compressors due to excellent stability Immiscible Suva R-134A (HFC) / BVA 3 (MO). V. CONCLUSIONS Solubility and low temperature miscibility of refrigerants … Lubrication D. Be compatible with the materials used in the shaft seal. 10.9kg cylinder refrigerant gas r410a . The miscibility of refrigerants with mineral oils is very important in the process of refrigerant substitution. 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. The properties of the oil selected must be suitable for this purpose. B. Have a low miscibility with the system refrigerant. 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. 5, the LCSTs for the mixtures of R407C with the lubricants with the viscosity grades 32 and 220 differ by 30-45 °С. POE are synthetic lubricants with high chemical and thermal stability. 1234yf refrigerant gas. CO2-oil minimum miscibility pressure (MMP) is a key parameter in CO2 enhanced oil recovery (CO2-EOR) process. 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. A dynamic test facility was constructed and used to examine oil return under varying system operating conditions. Miscibility is the ability of an oil to dissolve uniformly in refrigerant in either the liquid or vapor state. It is essential that the oil in a hermetic compressor: A. Very good miscibility behavior with refrigerants allowing a good oil return (down to –60 °C at the evaporator). ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) In an automotive engine, motor oil stays in the crankcase where it belongs. POE oils are also compatible with hydrocarbons such as R290 propane and R1270 propylene. POE oil POE Lubricants for Air Conditioning & Refrigeration Systems. 26 Full PDFs related to this paper. Oil is used in refrigeration systems to lubricate compressor bearings and other moving parts. FUCHS RENISO refrigeration oils for virtually all refrigerants e.g. 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 summary of most common refrigerants and their oil compatibility is detailed below. The oils have good miscibility with R-12 and superior stability. POE oils gener-ally offer good CO 2 miscibility. 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. RENISO - Refrigeration oils based on Mineral Oil, PAG, PAO or POE. 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). • 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. PAG oils and CO 2 only allow limited miscibility (larger miscibility gap with CO 2). Chemical properties of refrigerant. 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. In the field of lubricants and lubrication technology, refrigeration oils are of particular importance. POE has good miscibility with mineral oils, whereas PAG oils have poor miscibility. Immiscible is when the oil and refrigerant do not mix and stay in two phases. 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. viscosity grade of the oil, the lower LCST of the refrigerant/lubricant mixture. BVA RPOE Series is miscible with all HFC, HCFC, CFC and blends. C. Be extremely hygroscopic. Fundamentals of Petroleum and Petrochemical Engineering Mineral oils typically used with R-22 has relativity low Miscibility with R-410A. Due to their good miscibility with refrigerants they are the best choice for applications with HFC/FC such as R134a, R404A, R407C. Depending on the type of compressor different kinds of bearings and bearing arrangements are chosen. Older CFC and HCFC refrigerants tended to use Mineral Oil (MO) and Alkyl Benzene (AB) oils. refrigerant gaz r 1234 yf refrigerant gas r1234yf.
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