Abstract: According to R32 refrigerant correlation, the evaporation pressure and condensation pressure of R32 are 1.06 times and 1.03 times of R410A respectively. The unit cooling capacity of R32 is 1.52 times that of R410A. R32 is more efficient than R410A in the same refrigeration system. Through experimental verification 1.5 horse frequency conversion air conditioner, for example, the best filling quantity of R32 for about 75% of the R410A, throttle refrigeration system components need longer than R410A capillary, rated refrigerating performance comparison, the refrigerating capacity of the R32 than R410A 0.9% increased, the promotion of energy efficiency 4.7%. Compared with the rated heating performance, the heating capacity of R32 is 4.2% higher than that of R410A, and the energy efficiency is 3.6% higher. The heat produced at low temperature was 3.9% higher than R410A. Overall APF energy efficiency R32 is 2.5% higher than R410A. The copper wire motor used in the above air conditioning unit was changed into aluminum wire motor. The motor power was increased by 10W and the overall APF was 3.55. In terms of cost, aluminum wire motor is about 5 price cheaper than copper wire motor, so as to achieve the purpose of cost reduction, which provides a reference for the future development of R32 replacing R410A in variable frequency air conditioners.

Key words: R32, R410A, Variable frequency air conditioner, Comparison and analysis