What Types of Lubricants are HFO Refrigerants That can be Miscible in?

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When it comes to refrigerants, there are many factors to consider. One important aspect is the type of lubricant used with the refrigerant. Choosing the appropriate lubricant can help ensure the longevity and efficiency of the refrigeration system. However, with so many options available, it can be overwhelming to determine which lubricants are compatible with which refrigerants. What Types of Lubricants are HFO Refrigerants that can be Miscible in?

In this blog, we will explore the types of lubricants that can be used with HFO refrigerants and which ones are miscible. Let’s find out with lubricationfaqs!

Understanding HFO Refrigerants 

After hydrofluorocarbons (HFCs), hydrochlorofluorocarbons (HCFCs), and hydrofluoroolefin (HFO) and hydrocarbon (HC) refrigerants, they are referred to as the fourth generation of refrigerants.

Due to their excellent energy efficiency, low cost, and environmental friendliness, HFO refrigerants are commonly regarded as the next generation of refrigerants. They are actually unsaturated HFC refrigerants.

HFO is distinct from HFC in that it is an olefin derivative as opposed to an alkane (paraffin). In contrast to alkanes, which have single bonds connecting the carbon atoms, olefins have double bonds.

The components of hydrofluorocarbon (HFC) refrigerants like R-134a, -125, -143a, and -152a as well as HFC-based refrigerant blends like R-507, -407A, -407B, -407C, and -410A are all fluorine, carbon, and hydrogen atoms joined by single bonds. A minimum of one double bond exists between the carbon atoms in hydrofluoroolefin (HFO) refrigerants, which also contain hydrogen, fluorine, and carbon atoms.

What Types of Lubricants are HFO Refrigerants that can be Miscible in?

HFO is miscible with lubricating oils of the Polyolester (POE) class. HFO and POE lubricants mix together similarly to R-134a does. Mineral oils and lubricants containing alkylbenzene do not dissolve HFO.

The HFO-1234yf and HFO-1234ze are two frequently used HFO refrigerants. Both HFO-1234yf and HFO-1234ze have a very low global warming potential (GWP) and no ozone depletion potential (ODP). These refrigerants have a substantially shorter life cycle in the atmosphere because of the lower GWP values.

These two HFO refrigerants have an A2L safety grade, which indicates that they are low flammability yet low toxicity. The maximum burning rate of A2L and B2L, low flammability refrigerants, is equal to or less than 10 centimeters per second (cm/s) or 3.9 inches per second (in./s). The “lower” degree of flammability is denoted by a capital “L.” HFOs now in use have a safety grade of A1 (non-flammable), although more study and testing with these refrigerants are needed.

A low GWP alternative to R-134a called HFO-1234yf is designed for use in mobile air conditioning (MAC) systems in the automobile sector. Currently, HFO-1234yf is being used for portable air conditioning applications by many European and few US automakers.

Despite ASHRAE’s classification of the refrigerant as mildly flammable, years of testing by the Society of Automotive Engineers (SAE) have shown that HFO-1234yf cannot ignite under conditions often seen in vehicles.

Numerous research have been done on the safety of HFO in stationary applications such centrifugal chillers and automobiles due to its low flammability. The creation of standards and norms for the safe use of highly volatile A2L refrigerants is a crucial factor in the broad acceptance of HFO refrigerants.

What Types of Lubricants are HFO Refrigerants that can be Miscible in?

Some Priority Suggestions for You

HFC refrigerants can be replaced by hydrofluoro-olefin (HFO)

For the purposes of the present invention, alternative refrigerants typically include all tetrafluoropropenes, such as 2,3,3,3-tetrafluoropropene, HFO, etc. Hydrofluoroolefins (HFOs) are also considered alternative refrigerants. Solstice® ze refrigerants, GRADE GWP, are more oil soluble and less difficult to combine than traditional HFCs or HCFCs.

Honeywell advises the use of a miscible lubricant recommended by the compressor manufacturer. In addition to several stationary applications utilizing HFC refrigerants, polyol esters can be used in belt-driven, hybrid, or electric portable R134A systems.

Refrigeration oil R134a

It is now used worldwide in many refrigeration systems… R134a is in fact a typical gas used in many performance tests. This is by design because the liquid with 001-3 MPa is divided into 60 columns: Due to the characteristics of r134a refrigerant. It is used in air conditioners, refrigeration equipment, refrigeration equipment, polymer manufacturing, medicine and cosmetology Due to the refrigerant r134a… . Two common HFO refrigerants are HFO-1234yf and HFO-1234ze. POE oil is miscible with any trace of mineral oil that may be present in the system.

Refrigerator R134a by Mota-Babiloni et al.

The degree of miscibility between lubricants and refrigerants is actually determined by their chemistry. R32, miscibility, HFO, R452B, R454B, and refrigeration oil are some of the terms used. The 134a substitute 1234YF, for instance, has a 335-times lesser potential to cause global warming than 134a. And only four times higher than regular carbon dioxide. With CFCs and HCFCs, mineral oil is a compressor lubricant.

Winding Up

In conclusion, HFO refrigerants have emerged as a promising alternative to traditional refrigerants due to their low global warming potential and high energy efficiency. However, it is crucial to select the right type of lubricant that can be miscible with HFO refrigerants, as the wrong lubricant can cause damage to the system and compromise its performance. With an understanding of the various types of lubricants that are miscible with HFO refrigerants, it is possible to choose the right lubricant for your system and ensure its optimal operation.

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