Abstract
Reducing global warming potential (GWP) of refrigerants is needed to the decrease of ozone-depleting of refrigeration systems leakages. Refrigerant R1234yf is now used to substitute R134a inside mobile air conditioning systems. Thermodynamic properties of R1234yf are similar to R134a. Also, it has a very low GWP of 4, compared to 1430 for R134a, making it a proper choice for future automobile refrigerants. The purpose of this research is to represent the main operating and performance differences between R1234yf and R134a. Experimental analysis was carried out on the automotive air conditioning system (AACS) with 3 kW nominal capacity, to test and compare the performance of R134a with R1234yf. Experiments were accomplished for both refrigerants in almost the same working conditions and procedure with a range of ambient temperature varied from 26oC to 50oC. Parameters studied were ambient temperature, type of refrigerant in the system at compressor speed 1450 rpm, and internal thermal loads of passenger room. The performance characteristics of the system, including COP and cooling capacity, were studied by changing different parameters. The results show that COP of R134a is higher than R1234yf by 12.6%, while the refrigeration effect of R134a is higher than R1234yf by 25%. This shows that R1234yf is a suitable and good candidate for drop-in replacement of R134a in AACS.
Highlights
Refrigeration and the components that work on this principle have made the human life easier, the cooling system in the vehicle is designed to keep cold, comfortable, and safe when the temperature outside is high
The results indicated that R600a and R290 couldn't be the replacement of R134a in the automotive air conditioning system (AACS) because of high flammability
Results showed that the coefficient of performance (COP) of R134a becomes 24% higher than of R1234yf
Summary
Refrigeration and the components that work on this principle have made the human life easier, the cooling system in the vehicle is designed to keep cold, comfortable, and safe when the temperature outside is high. Most automobile air conditioning systems in Iraq operate with R134a refrigerant. Research has revealed that this refrigerant is harmful to the environment. There are many refrigerants alternatives of R134a, but the question which is of utmost importance is and which refrigerant works the best. The current vehicle air conditioning system refrigerant (R134a), which is used in all motor vehicles since the early nineties, will be phased out in the coming years.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
