Furthermore, a theoretical method of a new evaluation index was proposed to predict the miscibility of refrigerants with mineral oils with satisfactory accuracy. R32 is a refrigerant that excels in various applications and has seen wide use in recent years. In case of good miscibility between the refrigerant gas and the oil, if the oil is carried into the circuit it will come back easily with refrigerant. Moreover, when R32 is dissolved in refrigeration oils, the The 36%, 47%, 68%, 81%, and 90% 7 refrigerant mixtures were immiscible at temperatures below -40.3°C, -30.1°C, -20.5°C, -9.7°C, and -19.6°C, respectively. It also has excellent chemi-cal and thermal stability, as well as, superior lubric- ity characteristics on steel and aluminum. Recently, the CP-4214 SERIES fluids have been tested with R-502 and found to be miscible to very low temperatures when the ISO viscosity grade selected is ISO 150 or lower. A set of simple equations was derived to describe the experimental results. R32 is widely used as a refrigerant for air-conditioners. 3. Additionally, they have total miscibility with fluorocarbon refrigerants. Alternative oils with good miscibility with HFCs have been developed, because mineral oil, the primary oil used with R-22, has low miscibility with HFC. By continuing to use this site you agree to our use of cookies. The oil-refrigerant mixture The condensed refrigerant, e.g. This helps in using the compressor of low compression ratio that has higher efficiency. This study tries to identify influence of oil-refrigerant solubility on the performance of refrigerant compressors. Refrigerant miscibility according to DIN 51514: The miscibility behaviour of the refrigeration oil with various refrigerants is shown in miscibility-gap diagrams. In refrigeration systems, lubricant oil cannot be considered alone, because it functions as a refrigerant-oil mixture. Electrolytic Cd60b Motor Start Capacitors. R32 is widely used as a refrigerant for air-conditioners. chemical miscibility of the refrigerant-lubricant pair is a good indicator of how well the refrigerant will help move the oil around the system. Find out more. By using this site you are aware of the Terms of Use and Privacy Policy. If refrigerant oil did the same thing—that is, if it remained in the Moreover, when R32 is dissolved in refrigeration oils, the kinematic viscosity of the oil drops sharply. In an automotive engine, motor oil stays in the crankcase where it belongs. But the fact that some fractionation occurs, means that charging techniques must be adjusted. (4) The flash point is high enough: 20-30 degrees higher than the compressed exhaust gas temperature. R290 (Propane) is added as the third component to R402A/B and R403A/B to improve miscibility with traditional lubricants as hydrocarbons have especially good solubility characteristics. PVE is used for A/C systems as well as refrigerator and freezer applications. miscibility between the refrigerant and refrigeration oil must be assured, because the oil needs to return to the compressor from the refrigeration cycle and lubricate the sliding parts. Another significant difference between R-410A and R-22 is its saturation pressure range. The use of 1,1,1,2-tetrafluoroethane for increasing the miscibility of 2,3,3,3-tetrafluoropropene with a lubricating oil, and in particular with a polyalkylene glycol oil. The oil return characteristics and heat transfer effects of the lubricants are being studied again. Hard Start Capacitor Spp6 Spp5. This miscibility is a very important factor in the returning of the lubricant to the compressor in a refrigeration system over its range of operating temperatures. Refrigerant Compressor Oil is manufactured from carefully selected wax-free base stocks to have a low pour point and a low fl oc point for use in refrigeration system compressors. If possible, the refrigerant must be odorless, but easy detection in the air is desirable. Good miscibility lets the circulating refrigerant carry oil safely round the system to the o-rings, seals and flexible pipework and back to the compressor. are used as lubricants in sealed refrigerator systems. This site uses cookies. 9. It has excellent thermodynamic properties including a high cooling capacity and is therefore suitable for a large Using an inadequate lubricant oil can result in serious problems, such as: We will treat other aspects related to lubricant oil – such as the viscosity and correct load – in future editions. These studies examined mixtures at three refrigerant-lubricant concentrations (10, 50, and 95% refrigerant by weight) and a single viscosity for each lubricant. Therefore, a general understanding of the oil-refrigerant mixture flow with foam formation through small channels is crucial in order to develop a knowledge basis onto which lubrication and gas leakage models can be built. DR-5 and R444B can be good alternatives to R134a, R404A, R410A and R22, respectively. Remember, R-410A is a near azeotrope that is subject to some … An experimental device was designed to measure the miscibility of refrigerant and lubricant mixtures. Looking for more information about oil? Hold tight! 2. * HFCs used for substitution of HCFCs in retrofits. It must be highlighted, that the compatibility between these two elements is essential for proper functioning of the compressor and for its daily life. Analysis of the obtained results showed that the solubility of refrigerant/lubricant mixtures depends weakly on the viscosity grade of the oil. When the temperature drops to a certain value, the paraffin begins to precipitate. performance characteristics: high oil film strength; Good chemical stability; The flow of the special properties; Low floc point; Outstanding thermal stability; Good miscibility with the coolant. 3. refrigerant and oil, the new oil must be miscible with the old oil in the system. A. Miscibility 1. Previous: Relationship Between Refrigeration Oil And Compressor, Next: How To Distinguish Poor Quality Refrigerant, Halocarbon C318 C4F8 Octafluorocyclobutane Used as Propellant in Food industry and Refrigerants, Miscibility Of Refrigeration Oil And Refrigerant. The physical, chemical and thermal properties of the frozen oil should meet the following requirements: (1) Appropriate viscosity: The viscosity is too large, the flow resistance is large, the frictional power consumption and starting resistance of the compressor will increase; the viscosity is too small, the lubricant film is not easily formed, and the sealing property is also affected. Développement d’une huile à miscibilité améliorée pour le R32. MISCIBILITY PVE has superior miscibility with R-410A compared to POE. (Please note that while Alkyl Benzene oil can be used as a replacement in most mineral oil applications these two oils are not the exact same. Polyolester (POE) – The most common oil utilized in refrigeration and air conditioning systems using HFC / HFO refrigerants. • Propane (R290), n-butane (R600) and iso-butane (R600a) and their mixtures are the leading candidates. R ch e. structur POE chem . Hydrocarbon lubricants, such as naphthene mineral oil or alkylbenzene, have excellent miscibility with conventional chlorine-containing refrigerants due to the high lipophilicity of chlorine. The refrigerating oil is highly miscible with the refrigerant and enters the condenser and the evaporator with the refrigerant. Syn-thetic, polyalphaolefin-based refrig- eration oils are not miscible with CO 2. Mineral refrigerant oil, also known as Alkyl Benzene oil, is probably the one that most of you are used to. In this chapter, the thermodynamic properties of R-134a, Polyalkylene Glycol (PAG) oil and their mixture were investigated. 2.2 Carbon Dioxide (CO 2) R-744 CO 2 has been used as a refrigerant since 1850 and is now regaining popularity due to its low environmental impact. XIAMEN JUDA TRADING CO.,LTD.COOLMAX INDUSTRIAL CO.,LTD. * HFCs used for substitution of HCFCs in retrofits. The oils have good miscibility with R-12 and superior stability. In automotive air conditioning systems, polyglycol (PAG) is used by most manufacturers, but some manufacturers recommend POE for retrofits. However, R32 is known to have lower miscibility with refrigeration oils than do other refrigerants such as HFCs and HFOs. POE oils is also more hydrolytic stable than PAG oils. Depending on the type of compressor different kinds of … Properties of Refrigerant Oils R32 lacks compatibility with mineral oil (SUNISO) and reduces oil return performance, so to ensure compatibility ether oil (a synthetic oil) has been selected as the refrigerant oil for R32 units. Miscibility of Refrigeration Oil and Refrigerant. Toxicity classification of re-frigerants is assigned to classes A or B. The compressor acts as the heart for the A/C system; performing a critical role whereby, if the compressor stops working, the Air Conditioning system will fail too. @article{osti_417971, title = {Oil-return characteristics of refrigerant oils in split heat pump system}, author = {Sundaresan, S G and Radermacher, R}, abstractNote = {Currently, HFC substitute refrigerants for R-22 are being evaluated in air-conditioning and heat pump applications. POE has good miscibility with mineral oils, whereas PAG oils have poor miscibility. The oil therefore should have the correct lubrication performance, viscosity and miscibility with refrigerant. The problem of oil return to the compressor crankcase is simplified when an oil-miscible refrigerant is used, by the admixture of the oil and the refrigerant in the system. CompStar® SK Series is fully synthetic refrigeration oils based on chemically and thermally stable alkyl benzene. Choosing refrigerants have what demand? Analysis of the obtained results showed that the solubility of refrigerant/lubricant mixtures depends weakly on the viscosity grade of the oil. If possi-ble, the refrigerant must be odorless, but easy detection in the air is desirable. Oil-refrigerant mixture Synthetic refrigeration oils for NH 3 applications ... offer good CO 2 miscibility. Polyvinyl ethers are also being introduced in some applications. (2) the cloud point is lower than the evaporation temperature; u Cloud point: Traces of paraffin remain in the frozen oil. Suitable for very low evaporation temperatures down to -80° C. HFC-134a Good Price pure and safety car air conditioner gas refrigerant 134a 1000g. Solubility data of refrigerant/lubricant mixtures have been modeled with cubic equations of state (EOS): van der Waals (vdW), Soave-modified Redlich–Kwong (SRK), or Peng–Robinson (PR) types. Miscibility is the ability of an oil to dissolve uniformly in refrigerant in either the liquid or vapor state. Xiamen Juda Trading Co.,Ltd welcomes your comments! (The data are needed to determine the suitability of refrigerant/lubricant combinations for use in refrigeration systems.) Miscibility is the ability of the lubricant and the refrigerant to mix. Generally large refrigerant systems, particularly those using ammonia as a refrigerant, are equipped with oil separators. “Refrigera- tion oils are generally required to have good miscibility with the refrigerant, good lubricity and chemical stability under the refrigerant atmospheres. Today, a big variety of refrigerant fluids are in use, and because of this, it is necessary to check its compatibility with the different types of lubricant oil. Oil mass fractions from 5 to 50 % over a temperature range of … XIAMEN JUDA TRADING CO. LTD! Is no problem of the oil return back to compressor however, r32 is known to have lower with! 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