R404a replace R22 refrigerant issue to consider

at present, the domestic refrigerant industry throw is the most widely used refrigerant R22, but due to the damage to the ozone layer and the higher the greenhouse effect, our country in accordance with the relevant international agreed to determine the save for a rainy day refrigerating products manufacturers, has begun to gradually accept and use new HFC green environmental protection, such as the substitute for R22R r404a refrigerants, but in actual use, there are many differences must pay attention to both. In order to help you better use of HFC green new environmental protection refrigerants, now in the piston compressor refrigeration system using R404A refrigerant the author analyzes some problems to be pay attention to

1. Using R404A replace R22 smooth oil problem is the biggest problem, it is necessary to form a complete set USES PVE ester oil smooth replace R22 with mineral oil. Esters smooth high affinity of oil and water, dehydration nature difference, it should be used in the as far as possible in order to prevent air touch with the outside world, the container after opening, should use as soon as possible, after use shall be kept sealed; Away from the oxidant, strong alkali, strong acid, preserved in good ventilation advantages; When using, should prevent touch skin and eyes, prevent the steam inhalation and spray. 2. The exhaust pressure of refrigerant R404A is about 1 of R22. 2 times, mass flow rate is 1 of R22. Around 5 times, add exhaust velocity, resistance increased. Condenser, in general, the change of heat capacity than R22 increased 20% ~ 30%. 3. Same temperature R404A and R22 saturation pressure is different, so the R404A and R22 thermodynamic expansion valve action organization. Together for refrigerant R404A and smooth oil sealing material intermiscibility, expansion valve sealing material will change accordingly, so, on the thermal expansion valve selection should choose R404A dedicated expansion valve. 4. Because of saturation pressure is higher than R22 refrigerant R404A, so the system pressure container plan to make changes, to ensure safety. Such as accumulator and gas-liquid separator, etc. System parts together on the relief valve and fusible plug setting of the device will be changed. Because in the same conditions of displacement, R404A gas density is about 50% larger than that of R22, so when using R404A refrigerant piping plan, selection of pipe diameter than the R22. 5. The same compressor, using R404A current than R22, so the communication of the compressor touch device, thermal relay, and cable wire diameter to adjust. In the aspect of system maintenance, high pressure switch Settings by 2. 45 mpa is adjusted for 2. 7MPa。 6. Since 404 a saturation pressure and R22 is different, so the air tightness test pressure than R22. Vacuum system should be higher than that of R22, moisture content is lower than R22. To with liquid refrigerant filling type filling, in case of R404A configuration change. 7. Azeotropic mixed working medium R404A right and wrong, non azeotropic mixture composition concentration change with temperature, pressure and change, the production of refrigeration system, debugging and repair are surely bring difficulties, impact on system heat transfer function will occur, must, especially when the refrigerant leakage, all emptying system refrigerant demand substitution, such ability ensure the mixture fraction, and cooling ability to planning, otherwise it will get worse and worse. Because refrigerant R404A and smooth intermiscibility of oil and water is very good, so the system of water and residue, and cleanliness requirements such as compared with R22 refrigerant are improved, R404A water control system and impurities control is an important indicator of system to change the corresponding filter equipment, etc.

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