The difference between R22 and R410A refrigerant, you must know when purchasing refrigerant

With the gradual phase-out of R22 refrigerant, the use of R410A refrigerant is getting wider and wider. Many friends ask Refrigeration Encyclopedia whether it is unreasonable to replace R22 in the system with r410a directly. The physical and chemical parameters of the two refrigerants are different, and there are differences in the system design, which requires attention.

The difference between R22 and R410A refrigerant

1, R410A refrigerant needs to use synthetic refrigerating oil (POE), because POE oil has high hygroscopicity, it is easy to occur Hydrolysis, compared with R22, R410A system has stricter requirements for moisture content.

2. In terms of perfusion volume, after the heat exchanger structure is reduced, the perfusion volume of the R410A system is reduced by about 20%-30% compared to the R22 system. The overall heat transfer characteristics of the R410A system are larger than that of R22, the heat transfer efficiency is high, and the heat exchanger can be miniaturized.

3. R410A is a refrigerant that is a mixture of HFC-32 (R32) and HFC-125. R410A has higher requirements for copper tubes, while R22 can use ordinary copper tubes; R410A has a higher operating pressure than R22 50~70% higher, about 1.6 times.

4. R410A is of low toxicity, has no combustion spread, and does not destroy the ozone layer. R22 is fatal and destructive to the ozone layer; R410A system has better cooling capacity, if R22 is 100% cooling capacity, R410A is The refrigeration capacity is 147%;

5. Even if R410A does not destroy the ozone layer, the greenhouse gas it produces, the greenhouse gas effect it produces even partially exceeds R22. Therefore, R410A is not the ultimate environmentally friendly refrigerant solution for China's air-conditioning industry. Haha, all those friends who say that R410A is an environmentally friendly refrigerant, you can rest.

6. R410A has a higher vapor density than R22, so the vapor flow rate of R410A is about 30% slower than that of R22; R410A is more soluble than R22. When the residue floats on R410A, it can circulate smoothly in the system.

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Other precautions

1. R410A copper pipes must use high-strength and pressure-resistant special copper pipes, and spare parts must also use special-purpose copper pipes. R410a copper tubes can be used instead of ordinary R22 copper tubes, but it is absolutely impossible to replace R410a copper tubes with ordinary R22 copper tubes.

2. When the R410A new refrigerant split is installed, it must not be confused with the connecting pipe and refrigerant used by the R22 air conditioner.

3. R410A air conditioner has high installation requirements. Do not drip sweat into the connecting pipe, and do not mix other insoluble impurities into the system. In this refrigeration encyclopedia, it is recommended that the system be vacuumed so as not to cause mixed pollution of the refrigerant

4. During maintenance, if the refrigeration system is cut, the filter drier must be replaced, and the refrigeration system must not be exposed to the air for a long time More than five minutes.

5. R410A refrigerant should be stored in an environment below 30°C. If it has been stored in an environment above 30°C, it must be stored in an environment below 30°C for more than 24 hours before it can be used.

6. The four-way valve used in the R410A system has clear requirements for cleanliness, while the four-way valve used in the R22 system has no requirements for cleanliness.

7. The design maximum working pressure of the shut-off valve is different, the use of refrigerant R22 is 3.0MPa, and the use of refrigerant R410A is 4.3MPa. R22 is a 3.0 MPa brass connector, and R410A is a 4.3 MPa stainless steel connector.

8. The pressure value of the pressure switch is different, R22 system usually chooses 3.0/2.4MPa, R410A system usually chooses 4.2/3.6MPa.

9. Under rated voltage, the capacity of each displacement (1cc) of the R22 system compressor is about 175W, and the capacity of each displacement (1cc) of the thermal R410A system compressor is about 245W, which is R22 About 65% to 70% of the system.

10. The outdoor unit of the refrigeration system is marked with which type of refrigerant is used by the equipment, and what kind of refrigerant is used for the marked refrigerant. R22 cannot be directly replaced with R410a.

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