R410a Refrigerant

Alternatives of R134A and future of Car AC Refrigerants Two

R744 Refrigerant (CO2)

Modine is trying to develop a carbon dioxide based refrigerant system to reduce the greenhouse effect.It is one of the most popular alternatives as it has a warming potential of only one and it is readily available.

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alternatives of r134a and future of car ac refrigerants two

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Alternatives of R134A and future of Car AC Refrigerants One

• Modine has contract from US Army and it has demonstrated its refrigerant in Army Humvee.
• Recently BMW has shown interest in their technology.
• Another good news for them is that the German Automotive Association plans to switch to CO2.

Modine is claiming that there is a conspiracy to sideling CO2 based refrigerants.German Federal Environment Agency is supporting R744(CO2 based) refrigerant after tests conducted by it found some safety issues with HFO-1234YF.

The downside of CO2 systems is that it requires more pressure to function properly and hence car makers have to make changes in the design to use CO2 as refrigerant.

HFO-1234YF

It was developed in joint venture by honeywell and dupont to meet the new EPA standards.It is accepted by GM for 2013 release of Buick,Gmc,Cadillac and Chervolet.Its biggest advantages are :

• It has warming potential of just four compared to 1400 of R134A
• It has atmospheric lifetime of just 11 days as compared to 13 years of R134A
• It is approved by EPA under its SNAP program.
• SAE tested it and found it superior to Carbon dioxide in performance and low in risk.
• The temprature pressure chart of HFO-1234yf and R134A are almost identical.So HFO-1234yf can be used in existing AC systems and its leak can be tested by existing R134A leak detectors.

At the moment the battle is between R744 and HFO-1234YF to become the R134a alternative in Car AC systems.Only the time will tell us the winner of Car AC Refrigerant war.Till then,wait and watch.