I have a question regarding refrigerants

Compared to R22, the main technical issues associated with using R410a are: 1) specialized compressors; 2) an operating pressure that is 1.5 times higher than that of R22, requiring pipelines and components to be designed to withstand such pressure. 3 Use lipid oil POE; 4 XH-10 or XH-11 molecular sieves are required as desiccants. 5 Without optimized matching, the cooling capacity is 1.4–1.5 times that of R22, and the efficiency is 0.92–1.0 times that of R22. If R134a is used, the operating pressure is 35% lower, but the relative cooling capacity is only 0.6, with an efficiency ranging from 0.72 to 0.9. It is best to consult the air conditioner manufacturer. The above is for your reference. :loveliness:

Thank you. Does using R407C mean lower requirements for the equipment? How is the amount of refrigerant injected controlled? According to what the pressure gauge shows? If we go by the pressure gauge, then adding less R410a should solve the problem of excessive pressure, right?

Yes, the operating pressure of R407c is similar to that of R22, so there are no higher requirements regarding the pressure-sealing capacity of the equipment； However, R407C is not recyclable; it cannot be recycled to any extent like R410a, and its cooling performance is also inferior to that of R410a. Therefore, from the perspective of energy efficiency, R410a is the better choice. Recharging refrigerant in household appliances is often done based on experience, as unskilled air conditioning technicians use cylinders without pressure gauges ； Professional refrigerant charging is carried out based on pressure gauge readings ； Such working fluids are themselves mixed fluids; they are refrigerants whose stable performance has been determined through testing, and they are created by manually mixing different substances. Their stability, corrosiveness, energy efficiency ratio, etc., cannot be guaranteed… Therefore, the proposal put forward by the original poster is not recommended.

Using R407C would be better, but it is still necessary to use a lipid-based oil such as POE, and to replace the desiccant with XH-10 or XH-11 molecular sieves. The biggest difference is that R407C is a non-azeotropic mixture, and its composition can change. I hope this helps you. :loveliness:

4# winniebear A product with minimal processing definitely won’t work. Since the saturation pressure has not been reached, why produce cold in the first place? Hehe. :loveliness:

6# huangqr: By “add less,” the poster seems to mean using less of that particular working fluid, but adding a little of another working fluid instead； Cooling is still possible even when the operating pressure is not reached, but the energy efficiency ratio will be lower.

Thank you very much to both of you for your help; the issue has been resolved. Thank you!