Comparison of advantages and disadvantages of commonly used refrigerants for air conditioning

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, 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%, which is in line with the pressure requirements of R410A system At the same time, the exhaust temperature of the R32 system is up to 35.3℃ higher than that of R410A. 2. Environmental protection characteristics: ODP value (ozone depletion potential value) is 0, but R32's GWP value (global warming potential value) is moderate. Compared with R22, the CO2 emission reduction ratio can reach 77.6%, while R410a is only 2.5% , It 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, and R1234YF, the lower limit of combustion of R32 (LFL) (lower ignition limit) is high, just these refrigerants In general, R32 is the least flammable. 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 overall energy saving is 4.3%. The experimental results also show that the refrigeration system using R32 has a slightly higher energy efficiency ratio than R410a. .

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

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