TY - JOUR
TI - Impact of the R407C and R134yf refrigerant charge on the performance of a new pure electric vehicle heat pump air conditioning system
AU - Su Zhiyong
AU - Chen Gang
AU - Zeng Haiyan
AU - Li Haijun
AU - Yu Yiwei
AU - Dai Yayu
AU - Xu Mengqi
AU - Tang Xinyu
JN - Thermal Science
PY - 2025
VL - 29
IS - 3
SP - 1943
EP - 1950
PT - Article
AB - The objective of this study was to investigate the impact of varying  refrigerant charge levels of R407c and R134yf on the refrigeration  performance of a vehicle heat pump air conditioning system. The study was  conducted under high temperature conditions (45°C) to assess the influence  of different refrigerant systems on refrigeration performance parameters.  The results demonstrated that the optimal refrigerant charge level can be  determined by analyzing the change in refrigeration performance parameters  with varying charge levels. The results indicated that an increase in the  refrigerant charge of R407c from 2.3 kg to 2.6 kg resulted in a maximum  cooling capacity and COP of the system reaching 4.935 kW and 2.1,  respectively. The optimal charging capacity of the system was determined to  be 2.5 kg. Similarly, an increase in the refrigerant charging capacity of  R134yf from 2.3 kg to 3.5 kg resulted in a maximum cooling capacity and COP  of the system reaching 5.08 kW and 2.71, respectively. The optimal charging  capacity of the system was determined to be 2.9 kg. The COP of the R134yf  system is 0.61 higher than that of the R407c system. Furthermore, the energy  saving of the R134yf system is more pronounced under extreme conditions.