Refrigerant R22 compared with other types of refrigerant

now air conditioning refrigeration professional throughout R22, its primary cause is R22 in the air conditioning temperature zone has superior physical properties and refrigeration function, and function stability, skills mature, low price. HFC is a class because of no damage to the ozone layer, is considered to be replaced as the preferred material in the future. Used instead of the primary material of R22 has everything, R407c, r410a, but these HFC class material, because the physical properties of constraints are not the most ideal substitute R22.

1。 R22 and R123 contrast: ( 1) CFCS R22 and R123 belong to hydrogen, but R22 the destructive force of the ozone layer is R123 2. 5 times, the index of the greenhouse effect is R123 17 times. （ 2) R123 is low pressure refrigerant, transpiration when working for negative pressure, condenser is 0. 04 mpa, stop timing for 0. 004 mpa, therefore, even if the unit leaked may only exist outside air into the unit. （ 3) Critical pressure is higher than R123 1300 kpa, R22 unit internal progress, chance to progress to leak. 2. R22 and R134a has a contrast: ( 1) R134a has a specific volume is 1 of R22. 47 times, and the transpiration of latent heat is small, so in the case of a compressor with exhaust volume, R134a has a refrigerating capacity of the unit is only 60% of R22 unit. （ 2) Everything of the thermal conductivity than that of R22 fell by 10%, and heat exchanger heat transfer area increases. （ 3) R134a has a strong water imbibition, 20 times that of R22, so for everything dryer in the unit system of the demand is higher, in order to avoid system of ice wall. （ 4) Everything on the corrosion of copper is stronger, will happen in the process of using 'copper plating' thus system it is necessary to add additives. （ 5) R134a has a strong effect on swelling of rubber material in, in the process of practical application, refrigerant leakage rate is high. （ 6) Everything system needs a dedicated compressor and special lipid lubricating oil, lipid lubricant because with high water absorbability, foamability and high dispersion, high on the system function of safe sex to R22 system by using mineral oil. （ 7) Now, all kinds of HFC refrigerant and its special lipid oil price higher than that of R22, equipment operating costs will rise. 3. R22 and R407c contrast: R407c in thermal properties and R22 is most near, in addition to slightly in the refrigeration function, power and have the skills of the HFC class material, but also because of this kind of material due to non azeotropic mixture, its composition concentration varies with temperature, pressure, the air conditioning system of production, debug and repair must be hard, impact on system heat transfer function will occur, must. Especially when leaked R407c, system of refrigerant in the general case are all replacement demand, to ensure the share of the hybrid components, to achieve the best cooling effect.

4。 R22 and R410a contrast:

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in October 2002, the U. S. department of energy (doe) announced by the air conditioning and refrigeration skills seminar, refrigerant near critical point circular function special discussion, about the air conditioning system, compared the choosing R410 and separation of refrigerant R22 two air conditioning function. Outdoor temperature at 27. 8 ℃, R410 eer (air conditioning system EER) The R22 air conditioning system is slightly higher, and at the highest temperature of 54. 4 ℃, R410 eer (air conditioning system EER) Compared with R22 15% lower air conditioning system.

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