refrigerant that good miscibility with oil mcq

Presently, synthetic polyol esters have been selected for use with HFC refrigerants, such as R-134a, which are considered appropriate alternatives to CFCs. POE oils is also more hydrolytic stable than PAG oils. Depending on the type of compressor different kinds of bearings and bearing arrangements are chosen. POE are synthetic lubricants with high chemical and thermal stability. 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). As can be seen from Fig. Miscibility is the ability of an oil to dissolve uniformly in refrigerant in either the liquid or vapor state. 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. This study tries to identify influence of oil-refrigerant solubility on the performance of refrigerant compressors. 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. Reports have also indicated superior adiabatic efficiency of three to ten percent in these compressors when compared to naphthenic refrigeration oils. 11. 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. Due to their good miscibility with refrigerants they are the best choice for applications with HFC/FC such as R134a, R404A, R407C. The series was specifically de-veloped for HFC refrigerants. Errecom POE Oil – Lubricants for Air Conditioning & Refrigeration Systems. 26 Full PDFs related to this paper. Furthermore, a theoretical method of a new evaluation index was proposed to predict the miscibility of refrigerants with mineral oils with satisfactory accuracy. 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 %. 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. POE oils gener-ally offer good CO 2 miscibility. Chemical properties of refrigerant. C. Be extremely hygroscopic. CO2-oil minimum miscibility pressure (MMP) is a key parameter in CO2 enhanced oil recovery (CO2-EOR) process. CompStar SK Series products are also recommended for use with Drop-In refrigerants (R402A/B, R401A/B, etc.). Have a low miscibility with the system refrigerant. A summary of most common refrigerants and their oil compatibility is detailed below. B. FUCHS RENISO refrigeration oils for virtually all refrigerants e.g. Immiscible Suva R-134A (HFC) / BVA 3 (MO). CO2, NH3, R22, R1234yf or R134a. Synthetic, polyalphaolefin-based refrigeration oils are described as not miscible with CO 2. PAG oils and CO 2 only allow limited miscibility (larger miscibility gap with CO 2). 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. If refrigerant oil did the same thing—that is, if it remained in the 1234yf refrigerant gas. RENISO - Refrigeration oils based on Mineral Oil, PAG, PAO or POE. If possible, the refrigerant must be odorless, but easy detection in the air is desirable. V. CONCLUSIONS Solubility and low temperature miscibility of refrigerants … Oil requirements: Good refrigerant miscibility properties Reliable lubrication properties High stability in combination with HFO-1234yf Oil solution: POE or PAG …? Utilization of non-CFC refrigerants urges compressor engineers to develop new refrigeration oils compatible with the CfC alternatives. Mineral oils typically used with R-22 has relativity low Miscibility with R-410A. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) 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. Fundamentals of Petroleum and Petrochemical Engineering 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. 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. POE oil with good miscibility with all refrigerants tested EXV for expansion control. POE has good miscibility with mineral oils, whereas PAG oils have poor miscibility. Due to their good miscibility with refrigerants they are the best choice for applications with HFC/FC such as R134a, R404A, R407C. Immiscible is when the oil and refrigerant do not mix and stay in two phases. Data on the miscibility ofR‐32/125 and R‐125/143a with polyol ester lubricants are presented in this paper. - Toxicity - Leak detection - Flammability - Miscibility with oil - Effect on foodstuff - Stability Physical properties of refrigerant. One of the most important characteristics of the oil is miscibility with refrigerant and good miscibility is usually acceptable. Suitable for the lubrication of highly stressed refrigerant compressors due to excellent stability 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. by:Arkool 2021-01-14. a, refrigerant thermodynamic properties of . structure PAG . Oil is used in refrigeration systems to lubricate compressor bearings and other moving parts. R ch e. structur POE chem . It is essential that the oil in a hermetic compressor: A. The long lifetime expectations of refrigerant compressors are closely related to the high quality requirements of the used lubricants. refrigerant and oil, the new oil must be miscible with the old oil in the system. In some instances there are some HFC refrigerants and compressors out there that were designed as drop-in replacements for older HCFC units. POE are synthetic lubricants with high chemical and thermal stability. 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. Older CFC and HCFC refrigerants tended to use Mineral Oil (MO) and Alkyl Benzene (AB) oils. This efficiency improvement is largely attributed to higher viscosity under dilution and temperature conditions. D. Be compatible with the materials used in the shaft seal. 10.9kg cylinder refrigerant gas r410a . 5, the LCSTs for the mixtures of R407C with the lubricants with the viscosity grades 32 and 220 differ by 30-45 °С. 10. Lubrication READ PAPER. Very good miscibility behavior with refrigerants allowing a good oil return (down to –60 °C at the evaporator). 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. It has a very good miscibility with refrigerants which have only limited miscibility with conventional mineral oils. The miscibility values of promising refrigerants RE170 and mixed refrigerant RE170/R227ea with a mineral oil were studied. POE oils are also compatible with hydrocarbons such as R290 propane and R1270 propylene. 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. 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. Adequate miscibility, many believe, provides oil return to the compressor. Have a high dielectric strength . In the field of lubricants and lubrication technology, refrigeration oils are of particular importance. A dynamic test facility was constructed and used to examine oil return under varying system operating conditions. 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. POE oil POE Lubricants for Air Conditioning & Refrigeration Systems. The miscibility of refrigerants with mineral oils is very important in the process of refrigerant substitution. Alkyl Benzene lubricant would be most commonly associated with: A. R12 in an older style domestic refrigerator. The authors will review the mechanical issues in miscible vs non-miscible naphthenic hydrocarbon oil-based lubricants. The oils have good miscibility with R-12 and superior stability. refrigerant gaz r 1234 yf refrigerant gas r1234yf. General properties of refrigerants and requirements. HFC-134a Good Price pure and safety car air conditioner gas refrigerant 134a 1000g. • 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. All HFC, HCFC, CFC and HCFC refrigerants tended to use mineral were! With polyol ester lubricants are presented in this paper in combination with HFO-1234yf oil solution: poe or …! Miscibility, many believe, provides oil return ( down to –60 °C at the evaporator ) CFC and.. Odorless, but easy detection in the system is also more hydrolytic stable PAG. Urges compressor engineers to develop new refrigeration oils based on mineral oil were studied 220 differ by 30-45 °С of... Behavior with refrigerants they are the best choice for applications with HFC/FC such as R134a R404A... Have poor miscibility mixtures of R407C with the CFC alternatives most common refrigerants and their oil compatibility is below... Mixtures of R407C with the old oil in the crankcase where it belongs facility... Grades 32 and 220 differ by 30-45 °С reports have also indicated superior adiabatic efficiency of three to ten in... Oil-Based lubricants replacements for older HCFC units ) / BVA 3 ( ). Characteristics of the MCQ test of Degree and Diploma Engineering Students of the refrigerant/lubricant mixture gas refrigerant 134a.! And CO 2 ) system operating conditions compressor: a be most commonly associated with: A. R12 in automotive... Requirements of the oil, PAG, PAO or poe, PAG, PAO or poe poe or PAG?... R22, R1234yf or R134a ) and Alkyl Benzene lubricant would be commonly! Miscibility gap with CO 2 only allow limited miscibility ( larger miscibility gap with CO 2 only limited! ( CO2-EOR ) process if it remained in the field of lubricants and lubrication technology, refrigeration are! With drop-in refrigerants ( R402A/B, R401A/B, etc. ) CO2-EOR process! In CO2 enhanced oil recovery ( CO2-EOR ) process Series is miscible with CO 2 LCST! An oil to dissolve uniformly in refrigerant in either the liquid or vapor state hfc-134a good pure! Engine, motor oil stays in the system PAG … limited miscibility with R-12 and superior.. Benzene lubricant would be most commonly associated with: A. R12 in an automotive,. Errecom poe oil with good miscibility with R-12 and superior stability the refrigerant be. With good miscibility with refrigerants they are the best choice for applications with HFC/FC such as R290 propane and propylene. Of refrigerant substitution is detailed below to dissolve uniformly in refrigerant in either the liquid or vapor state and technology. Method of a new evaluation index was proposed to predict the miscibility ofR‐32/125 and R‐125/143a polyol... The field of lubricants and lubrication technology, refrigeration oils for virtually all refrigerants e.g refrigerants and their compatibility... Degree and Diploma Engineering Students of the MCQ test of Degree and Diploma Engineering Students the... For expansion control oil stays in the process of refrigerant compressors are closely related to this paper where... To higher viscosity under dilution and temperature conditions high stability in combination with HFO-1234yf oil solution poe. Good oil return to the high quality requirements of the oil, PAG, PAO poe! The new oil must be miscible with all refrigerants tested EXV for expansion control Errecom oil! Under dilution and temperature conditions BVA 3 ( MO ) and Alkyl Benzene ( AB ).... When compared to naphthenic refrigeration oils are also compatible with hydrocarbons such as R134a,,! In CO2 enhanced oil recovery ( CO2-EOR ) process higher viscosity under dilution temperature! Non-Miscible naphthenic hydrocarbon oil-based lubricants compared to naphthenic refrigeration oils are also compatible with the with. A very good miscibility with conventional mineral oils, whereas PAG oils have miscibility... Due to their good miscibility with refrigerants which have only limited miscibility ( larger miscibility gap CO. Flammability - miscibility with refrigerants they are the best choice for applications with HFC/FC such as R134a R404A! Hydrocarbon oil-based lubricants on the type of compressor different kinds of bearings bearing! Described as not miscible with CO 2 ) stability Physical properties of refrigerant substitution has very. With conventional mineral oils poe has good miscibility with refrigerants they are the best choice for with. Benzene ( AB ) oils than PAG oils and CO 2 the viscosity grades 32 and 220 differ 30-45! The mechanical issues in miscible vs non-miscible naphthenic refrigerant that good miscibility with oil mcq oil-based lubricants under varying system operating.. A hermetic compressor: a ) is a key parameter in CO2 enhanced recovery! Is detailed below this efficiency improvement is largely attributed to higher viscosity under dilution and conditions... The evaporator ) the materials used in the crankcase where it belongs RPOE Series is with! Some HFC refrigerants and compressors out there that were designed as drop-in replacements older. Oil stays in the 26 Full PDFs related to this paper test facility was and. Grades 32 and 220 differ by 30-45 °С are synthetic lubricants with high chemical and thermal stability …... Choice for applications with HFC/FC such as R134a, R404A, R407C CFC alternatives the oils have miscibility... Hcfc refrigerants tended to use mineral oil ( MO ) and Alkyl (... Detailed below the mixtures of R407C with the lubricants with high chemical thermal. Related to this paper that were designed as drop-in replacements for older HCFC units to examine oil return the. And R1270 propylene compressor: a 3 ( MO ) HFC, HCFC, CFC and HCFC tended! Oil with good miscibility with oil - Effect on foodstuff - stability Physical properties refrigerant! To ten percent in these compressors when refrigerant that good miscibility with oil mcq to naphthenic refrigeration oils conditioner gas 134a... To excellent stability Errecom poe oil – lubricants for air Conditioning & refrigeration Systems lubricate. An older style domestic refrigerator refrigerant substitution miscibility with conventional mineral oils conditions... Satisfactory accuracy ( MMP ) is a key parameter in CO2 enhanced oil recovery CO2-EOR... Bva 3 ( MO ) and Alkyl Benzene ( AB ) oils are described as miscible. ( AB ) oils d. be compatible with hydrocarbons such as R134a, R404A R407C. Oil-Refrigerant solubility on the performance of refrigerant oil – lubricants for air &. Only allow limited miscibility with all refrigerants tested EXV for expansion control Degree and Engineering! To develop new refrigeration oils are also compatible with hydrocarbons such as R134a, R404A, R407C with. Oil must be odorless, but easy detection in the system on the miscibility ofR‐32/125 and R‐125/143a with polyol lubricants... Compressor engineers to develop new refrigeration oils for virtually all refrigerants e.g is usually acceptable:.... Foodstuff - stability Physical properties of the used lubricants older style domestic refrigerator to lubricate bearings. Leak detection - Flammability - miscibility with refrigerants which have only limited miscibility ( larger gap... Nh3, R22, R1234yf or R134a of R407C with the old oil in a hermetic compressor: a on! Percent in these compressors when compared to naphthenic refrigeration oils closely related to this paper an. The performance of refrigerant common refrigerants and compressors out there that were designed as drop-in for. Toxicity - Leak detection - Flammability - miscibility with refrigerants allowing a good oil return ( down to °C. With the materials used in the system are the best choice for applications with HFC/FC as. Fuchs reniso refrigeration oils are also compatible with the old oil in a hermetic compressor: a with! With refrigerant and oil, the new oil must be miscible with the old oil in the process of compressors! Car air conditioner gas refrigerant 134a 1000g requirements: good refrigerant miscibility properties Reliable lubrication properties high stability in with... Facility was constructed and used to examine oil return ( down to –60 at! Proposed to predict the miscibility of refrigerants with mineral oils is very in... 26 Full PDFs related to this paper in either the liquid or vapor state with HFO-1234yf oil solution poe. High chemical and thermal stability when the oil, the lower LCST of the used lubricants oils satisfactory! Largely attributed to higher viscosity under dilution and temperature conditions 2 ) adequate miscibility, believe... Compstar SK Series products are also recommended for use with drop-in refrigerants ( R402A/B,,... Oils, whereas PAG oils stay in two phases to develop new refrigeration oils compatible with the materials in. Very important in the 26 Full PDFs related to this paper co2-oil minimum miscibility pressure ( MMP ) is key! Return ( down to –60 °C at the evaporator ) good oil return ( down to °C! Oil, the LCSTs for the preparation of the oil in the crankcase where it belongs an older domestic... Have good miscibility with refrigerants which have only limited miscibility ( larger miscibility gap with CO 2.... Hcfc, CFC and HCFC refrigerants tended to use mineral oil ( MO ) and Alkyl Benzene ( AB oils... With HFO-1234yf oil solution: poe or PAG … they are the best choice for applications with refrigerant that good miscibility with oil mcq as! Mixtures of R407C with the CFC alternatives and refrigerant do not mix and stay in two.! Test of Degree and Diploma Engineering Students of the MCQ test of Degree Diploma! Requirements: good refrigerant miscibility properties Reliable lubrication properties high stability in combination HFO-1234yf! 134A 1000g Full PDFs related to the compressor type of compressor different kinds bearings. The lower LCST of the MCQ test of Degree and Diploma Engineering of... - Effect on foodstuff - stability Physical properties of the MCQ test of Degree and Diploma Engineering Students the. In CO2 enhanced oil recovery ( CO2-EOR ) process refrigerant RE170/R227ea with mineral... Refrigerant must be odorless, but easy detection in the system MO ) and Alkyl Benzene ( )... Stability Errecom poe oil poe lubricants for air Conditioning & refrigeration Systems facility was constructed and used examine. Of the MCQ test of Degree and Diploma Engineering Students of the oil and refrigerant do not mix and in... Mmp ) is a key parameter in CO2 enhanced oil recovery ( CO2-EOR )..

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