HFO-1234yf (R-1234yf ) has a global warming impact value of 1 versus 1300 for R-134a. It breaks down chemically in the atmosphere in only 11 days versus 13 years for R-134a! While R-1234yf oils are backwards compatible with R-134a systems, R-134a PAG oils are not compatible with R-1234yf systems.
Mixing oils
While mixing A/C Compressor oils is usually not recommended, as it can lead to A/C Compressor damage and failure, the new ND-oil 12 can be used with both R1234yf and the old R134a type refrigerants.
1234yf is much more sensitive than r134a. It can and will damage the entire system. Not only that, but it's illegal.
If you were to put R1234yf in a system designed for R134a, it looks like you'd end up with about a 10% loss of cooling capacity, but putting R134a into a R1234yf system would be a wash. It appears R1234yf oil is compatible with R134a (but not vice-versa), so shouldn't be a problem there.
Its global warming potential (GWP) is ultra-low, with a rating of less than 1. This means that one kilogram of R1234yf released to the atmosphere has a significantly lower greenhouse effect than a kilogram of carbon dioxide. For comparison, R134a has a GWP of 1430.
The cooling capacity of R1234yf used as a drop-in replacement in a R134a refrigerant facility is about 9% lower than that presented by R134a in the test range. This difference in the values of cooling capacity obtained with both refrigerants decreases when the condensing temperature increases and when an IHX is used.
The chemical stabilities of copper, steel, and aluminum have been tested and confirmed as acceptable for use with Freon™ 134a and lubricants. Acceptable plastics and elastomers have been found for use with existing CFC refrigerants.
Still, the answer is an emphatic, “No.” Not only would a retrofit of this type negate the environmental benefits of R-1234yf, but it would also be a violation of Federal Law under Section 203 of the Clean Air Act: “tampering” with a vehicle's emissions control device.
2 (a) shows that the variation of the pressure-volume diagram is very similar when using R1234yf and R134a, with, R134a shows a higher final discharge pressure, with the difference in the indicated work for compressor when using both fluids to be less than 2%, as shown in Fig.
The ACX universal flushing unit is designed for refrigerants R134a and R1234yf. A proper flush of the air conditioning system is one of the most important tasks to be carried out during repairs and after the replacement of a compressor.
When undertaking lubricant selection for HFO 1234yf oil compatibility systems there remains a market acceptance that specialty synthetic 'double end-capped' polyalkylene glycols ('PAGs') are the preferred OEM choice.
Switching to R1234yf refrigerant is a step towards a greener future, but it comes with higher costs due to advanced equipment, stringent regulations, and specialized training.
Technically yes, as the pressures are similar. In fact an empty R1234yf system could even be recharged with R134a and still work - this is why they changed the connectors again, and in part why the R1234yf recovery machines are designed to sense if the refrigerant is contaminated with R134a and abort.
You can convert an empty R-1234yf system to R-134a. Mercedes made this obvious when it raised objections to R-1234yf over 11⁄2 years ago and recalled European models with the refrigerant, recovered it from the vehicles' systems and recharged them with R-134a.
Answer and Explanation: The lubricant which is used with the refrigerant R-134a is Polyolester oil (POE oil). Polyester oil is a type of synthetic oil. R134a does not mix well with mineral oils.
Lower Global Warming Potential (GWP): 1234yf refrigerant has a significantly lower GWP compared to 134a, making it a more environmentally friendly option.
The results which can be seen in Figures 5 and 6 show an excellent chemical compatibility for both refrigerants. In both cases the percent change was very minimal. They both had a slight increase in volume which is ideal to further fill the gap; providing a better seal.
The mixing of R-134a with R-1234yf will change refrigerant pressure and may result in evaporator freeze-up on pressure control systems, reducing system airflow.
Firstly, the primary difference is the environmental impact. Old refrigerants like R-12 and R-134a are known to contribute to ozone depletion and global warming. In contrast, 1234YF is classified as a has a much lower global warming potential. Secondly, the performance of the refrigerants is different.
The Intergovernmental Panel on Climate Change has since added R-134A to its list of greenhouse gases, declaring definitively that this refrigerant is a poor choice for the future of the planet and its inhabitants.
It is anticipated that by 2025 all vehicles will contain 1234YF. Don't fret, however, if your current vehicle requires 134a. Though 134a is not compatible with 1234YF and is expected to be phased out, it is still in production and will continue as long as there is a demand for repair of older vehicles.
The GWP for R-134a refrigerant is 1,430, making it 1,430 times more harmful than carbon dioxide when released into the atmosphere. There are three refrigerants that can be used to replace R-134a: R-1234yf, R-152a, and R-744.
ZEROL HD46 is a glycol lubricant designed specifically for application with R-1234yf refrigerant in mobile air conditioning systems. The oil is a double end-capped PAG, and is manufactured to exacting standards of high efficiency.
Freon™ 134a refrigerants are tested in Chemours laboratories that are ISO 9001 certified for their quality management system. The shelf life of Freon™ 134a is at least 10 years under normal storage conditions.
What Happens to Your AC System if You Mix Refrigerants? Mixed refrigerants can cause increased system pressures and temperatures changing them for the worse. This can result in ineffective compressor cooling and possible compressor damage, ineffective cooling, and metering device malfunction.