Comparison of advantages and disadvantages of air conditioning refrigerants

Currently, home improvement air conditioners are used to replace R22 refrigerants, basically only r410a and R32 refrigerants. Today Refrigeration Encyclopedia conducts a simple comparison and analysis on the characteristics of R22, R410a and R32.

1. Thermophysical properties: R32 charging volume can be reduced, which is only 0.71 times that of R410a. The working pressure of R32 system is higher than R410a, but the increase does not exceed 2.6%. It is equivalent to the pressure requirements of the R410A system, and the exhaust temperature of the R32 system is up to 35.3°C higher than that of the R410A.

2. Environmental protection characteristics: ODP value (ozone depletion potential value) is 0, but R32 has moderate GWP value (global warming potential value), and the CO2 emission reduction ratio can reach 77.6% compared with R22 , While R410a is only 2.5%, which is significantly better than R410a in terms of CO2 emission reduction.

3. Safety: R32 and R410a are non-toxic, while R32 is flammable, but among several alternatives to R22, R32, R290, R161, R1234YF, the lower limit of combustion of R32 (LFL) is high As far as these refrigerants are concerned, R32 is the least combustible.

4. Cycle performance: In terms of theoretical cycle performance, the cooling capacity of the R32 system is 12.6% higher than that of R410a, the power consumption increases by 8.1%, and the comprehensive energy saving is 4.3%. The experimental results also show that the R32 refrigeration system is used The energy efficiency ratio is slightly higher than that of R410a.

The comparison of some characteristics of the three refrigerants in the following table:

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