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