R513A is a new environmental-friendly refrigerant blended with R134a and R1234yf

featuring a GWP100 of 574

which is significantly lower than that of R407C. To verify the applicability of replacing R407C with R513A in locomotive air-conditioning systems

theoretical calculations and experimental comparisons were performed for the two refrigerants. The results show that when the refrigeration system is not modified

the pressure ratios of the R513A and R407C systems are similar; the cooling capacity is reduced by 28.1%; the COP is increased by 25.6%

and the discharge temperature is reduced by 18.24 ℃ under nominal working conditions. Under the same conditions

the cooling capacity decreased

although the COP of the R513A system significantly increased; therefore

the drop-in replacement cannot meet the cabin heat load requirements of the vehicle driver. The cooling capacity of the system can be increased by switching to a compressor with a larger displacement and changing the R513A refrigerant charge to satisfy the cooling demand of the vehicle.