Component/Design Characteristics:

The design of R-134a is similar to R-1234yf, but it does not have special component standard requirements and does not require a suction line heat exchanger.

Operating Pressure/Temperature:

The pressure/temperature curves of R-134a are similar to those of R-1234yf, though there are some differences at high temperatures and pressures.

Flammability/Safety:

R-134a is considered non-flammable, providing a higher level of safety. However, its global warming potential (GWP) is higher, leading to its gradual phase-out in favor of more environmentally friendly alternatives like R-1234yf.

Component/Design Characteristics:

• R-1234yf is similar in design to R-134a in automotive air conditioning systems, requiring minor component adjustments, such as changes to thermal expansion valves and condensers.
• The service ports are taller to prevent cross-contamination, and the evaporators must meet SAE Spec J2842 standards.
• Most vehicles using R-1234yf include a suction line heat exchanger to enhance efficiency.
  

Operating Pressure/Temperature:

The pressure/temperature curves for R-1234yf and R-134a are quite similar, with slight divergence at around 250 psig/150 degrees and above.

Flammability/Safety:

R-1234yf is classified as mildly flammable, meaning it could ignite when in contact with an open flame, but it has a low burning velocity and low combustion heat. Compared to other automotive fluids like gasoline and diesel, it presents significantly lower flammability risks.