Thermal Performance Analysis of Low-GWP Refrigerants in Automotive Air-Conditioning System

Table 1

Thermodynamic and environmental properties of the investigated refrigerants [19, 20].

Item	R152a	R1234yf	R1234ze(E)	R134a
Molecular weight (kg/kmol)	66	114	114	102
ASHRAE safety classification	A2	A2L	A2L	A1
Critical temperature (°C)	113	95	109	101
Boiling point (°C)	−24.0	−29	−19	−26
Critical pressure (kPa)	4580	3382	3636	4059
ODP	0	0	0	0
100-year GWP (GWP100)	140	4	6	1430
Atmospheric lifetime (years)	0.6	0.03	0.05	14