What's The Difference Between R22 And R410a Refrigerant

The normal water chiller manufacturer make the chiller usually use R22 refrigerant in China, but R22 is not friendly with environment, will bring Ozone layer destruction, so the eco-friendly type refrigerant be request more and more by the customers from different country.

R410a is one of the choose.

With the increasing use of R410A refrigerant, can we directly replace R22 with R410a in the chiller system?

NO. because the physical and chemical parameters of the two kinds of refrigerant are different, which should be paid attention to in the system design.

The difference about R22 and R410a

1. R410a request POE,  with high hygroscopicity and easy hydrolysis, so compared with R22, The R410A system has more stringent requirements for moisture content.

2. Filling volume. after the structure of heat exchanger is reduced, the filling volume of R410a system is reduced about 20%~30%, compared with R22 system, it has greater heat transfer characteristics, with higher heat transfer efficiency, the heat exchanger can be miniaturized.

3.  R410a is mixed refrigerant by HFC-32（R32） and HFC-125, the running pressure higher 50~70% than R22, so it's with the higher requirements for copper pipe than R22.

4. R410A with low toxicity, does not burn and spread, and does not damage the ozone layer,R22 is deadly to the ozone layer. R410a cooling efficient is higher 47% than R22.

5. R410A has a higher vapor density than R22, so the vapor flow rate of R410A is about 30% slower than R22. R410A is more soluble than R22. When the residue floats in R410A, it circulates smoothly through the system.

Announcements when choose R410a refrigerant:

1.  R410A copper pipe must use high strength pressure special copper pipe, spare parts must also use special. You can use R410a copper pipe instead of ordinary R22 copper pipe, but can't use ordinary R22 copper pipe instead of R410a copper pipe.

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

3. During maintenance, if the refrigeration system is cut, the filter dryer must be replaced, and the refrigeration system should not be exposed to the air for more than five minutes.

4. The R410A refrigerant must be stored at an environment lower than 30°C. If it has been stored at an environment higher than 30°C, it must be stored at an environment lower than 30°C for at least 24 hours before use.

5. The four-way valves used in the R410A system have clear requirements on cleanliness, while the four-way valves used in the R22 system have no requirements on cleanliness.

6. The maximum design working pressure of the globe valve is different. The use of refrigerant R22 is 3.0MPa, and the use of refrigerant R410A is 4.3MPa. The R22 is 3.0MPa brass and the R410A is 4.3MPa stainless steel.

7. The pressure switch value is different. 3.0/2.4MPa is usually selected for R22 system, 4.2/3.6MPa is usually selected for R410A system.

8. At the rated voltage, the compressor of the R22 system has about 175W per displacement (1cc). The compressor of the hot R410A system has about 245W per displacement (1cc), which is about 65% to 70% of that of the R22 system.