Refrigerant R507 and R404a can replace R502's environmentally friendly refrigerant, but R507 can usually reach a lower temperature than R404a, and is suitable for new commercial refrigeration equipment (supermarket refrigerators, cold storage, display cases, transportation), ice making equipment, transportation refrigeration equipment, Marine refrigeration equipment or updated equipment is suitable for all environments where R502 can operate normally.
The data on the pressure gauge and temperature gauge of R404a and R507 show that the pressure between the two is almost the same. If you usually pay attention to the system accessories used, you will find that the label description on the thermal expansion valve is shared by R404a and R507.
R404A is a non-azeotropic mixture. Liquid filling is used when filling, and R507 is an azeotropic mixture. The existence of R134a in R404a increases the mass transfer resistance and reduces the heat transfer coefficient of the heat transfer chamber, while the heat transfer coefficient of R507 is higher than that of R404a.
Judging from the current manufacturer's use results, the effect of R507 is indeed faster than R404a. In addition, the performance of R404a and R507 are relatively close. The power consumption of the R404a compressor is 2.86% higher than that of R507, the discharge temperature of the low-pressure compressor is 0.58% higher than that of R507, and the discharge temperature of the high-pressure compressor is 2.65% higher than that of R507. R507 is 0.01 higher than R507, and the intermediate temperature is 6.14% lower than R507.
R507 is an azeotropic refrigerant with a lower slip temperature than R404a. The composition change of R507 after multiple leaks is less than that of R404a, the volumetric cooling capacity of R507 is unchanged, and the volumetric cooling capacity of R404a is reduced by about 1.6%.
Using the same compressor, the cooling capacity of R507 is 7%-13% larger than that of R22, and the cooling capacity of R404A is 4%-10% larger than that of R22.
Regardless of whether it contains lubricating oil, the heat transfer performance of R507 is better than that of R404a.