Experimental analysis of the low-GWP refrigerant R1234yf as a drop-in replacement for R134a in a typical mobile air conditioning system

This study investigated the performance of a typical mobile air conditioning system using R134a and R1234yf as the working fluids under different working conditions. The system is composed of a microchannel parallel flow condenser, a laminated plate evaporator, a variable displacement compressor, and a thermal expansion valve. The different working cycles of each refrigerant were comprehensively compared. The optimum refrigerant charge amount of the R1234yf system was approximately 95% of the R134a system during drop-in tests. The performance of the R134a system was a little higher than that of the R1234yf system. The cooling capacity and system coefficient of performance of the R134a system were 12.4% and 9% larger, respectively. This result is mainly because of the thermophysical property differences between the two refrigerants and the improper expansion valve opening of R1234yf. Analysis on the whole cycle revealed that the R1234yf system could obtain a higher evaporating pressure and a larger superheat and subcooling. Redesigning the expansion valve for R1234yf could improve performance of the system.

[1]  G. Mathur.  Experimental Investigation of the Performance of a Laminate Evaporator with HFO-1234yf as the Working Fluid , 2011 .

[2]  S. Kondo,et al.  Flammability assessment of CH2CFCF3: comparison with fluoroalkenes and fluoroalkanes. , 2009, Journal of Hazardous Materials.

[3]  Dongsoo Jung,et al.  Nucleate boiling heat transfer coefficients of R1234yf on plain and low fin surfaces , 2010 .

[4]  G. W. Jepson,et al.  Biotransformation of 2,3,3,3-tetrafluoropropene (HFO-1234yf). , 2008, Toxicology and applied pharmacology.

[5]  G. Lorentzen.  Revival of carbon dioxide as a refrigerant , 1994 .

[6]  M. McLinden,et al.  NIST Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-REFPROP, Version 8.0 , 2007 .

[7]  O. Nielsen,et al.  Atmospheric chemistry of CF3CFCH2: Kinetics and mechanisms of gas-phase reactions with Cl atoms, OH radicals, and O3 , 2007 .

[8]  A. Cavallini,et al.  Heat transfer and pressure drop during condensation of the low GWP refrigerant R1234yf , 2010 .

[9]  Robert J. Moffat,et al.  Describing the Uncertainties in Experimental Results , 1988 .

[10]  Barbara Minor,et al.  HFO-1234yf Low GWP Refrigerant Update , 2008 .

[11]  Claudio Zilio,et al.  Simulation of R-1234yf performance in a typical automotive system , 2009 .

[12]  Gursaran D. Mathur,et al.  Experimental Investigation of AC System Performance with HFO-1234yf as the Working Fluid , 2010 .

[13]  G. Mathur.  Enhancing AC System Performance with a Suction Line Heat Exchanger with Refrigerant HFO-1234yf , 2011 .

[14]  W. Dekant,et al.  Biotransformation of 2,3,3,3-tetrafluoropropene (HFO-1234yf) in rabbits. , 2010, Toxicology and applied pharmacology.

[15]  Gursaran D. Mathur,et al.  Experimental Performance of a Parallel Flow Condenser with HFO-1234yf as the Working Fluid , 2010 .

[16]  M. Ghodbane.  On Vehicle Performance of a Secondary Loop A/C System , 2000 .

[17]  Mahmoud Ghodbane,et al.  An Investigation of R152a and Hydrocarbon Refrigerants in Mobile Air Conditioning , 1999 .