Guidelines for the use of R410a refrigerant and R22 refrigerant

Compared with the most common refrigerant R22, r410a has many performance advantages and good heat transfer. Its main performance advantages are reflected in the following aspects:

1. Compared with R22, the R410a system has a significant advantage: the evaporator The heat transfer is 35% higher, and the heat transfer of the condenser is 5% higher.

2. Its cycle working pressure is about 57% higher than that of HCFC-22, the refrigeration capacity per unit volume is about 43% larger than that of HCFC-22, and the coefficient of refrigeration is about 7.7% smaller than that of HCFC-22. The rest of the parameters are similar to HCFC-22. -22 is basically close.

3. Under the same mass flow rate, the pressure drop of R410a is relatively small.

4. Compared with the R22 system, the system matched with R410a can use a smaller volume condenser and evaporator, and can reduce the refrigerant charge by up to 30%.

5. The loss in the compressor compression process is lower, the evaporator and condenser have stronger heat transfer, and the pressure drop in the entire system is smaller, so the same cooling capacity and the same condensing temperature Among the systems, the energy efficiency ratio (COP) of the R410a system is 6% higher than that of the R22 system.

2. Installation and maintenance considerations:

1. The pressure of R410a is about 1.6 times higher than that of R22 refrigerant. When installing R410a refrigerant in air conditioners When using R410a special tools and materials, pay attention to safe operation.

2. Please do not mix air other than R410a refrigerant into the air conditioner's refrigerant circulation pipeline. If air and other gases are mixed in, it will cause abnormal high pressure in the refrigerant circulation pipeline, which is the main cause of rupture and cracks in the circulation pipeline.

3. If the refrigerant leaks indoors, it will form toxic gas once it comes into contact with an open flame.

4. Unlike other refrigerants used in the past, it is easily affected by impurities such as moisture, oxide layer, grease, etc. Therefore, full attention should be paid to the construction operation, and clean piping should be used to prevent moisture, etc. Mix in.

5. Since R410a is a simulated azeotropic mixture refrigerant, when adding refrigerant, use a liquid method. When adding refrigerant, use refrigerant container and electronic scale for weight measurement.

6. The pressure of household air conditioners using R410a refrigerant is much greater than that of traditional R-22 refrigerant. Therefore, in terms of material selection, it must be compatible with R410a. Copper pipes with a wall thickness of 0.7mm are available in the market and must not be used.

7. The pressure of R410a is relatively high, and the previous multi-pipe measuring meter cannot be used. The high-pressure standard and low-pressure meter are different from previous products. The following parameters can be referred to when purchasing a pressure gauge.

8. Once the R410a refrigerant is mixed with the lubricating oil (mineral oil) of the vacuum pump, a chemical reaction will occur and sludge will be produced, resulting in damage to the air-conditioning components.

9. The special refrigerant container for R410a is directly marked with the name of the refrigerant, and at the same time, it is also marked in color (pink) in accordance with the requirements of ARI in the United States.

10. The previous R-22 testing products cannot be used. A high-sensitivity leak detector dedicated to HFC refrigerant must be used.

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