Alternative refrigerant R22 refrigerant R404a issue to consider what aspects

a few days ago, the domestic is still the R22 as refrigerant in the refrigeration industry the most widely used, 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 beat all identified 2030 years ago in its use. Many domestic refrigeration products manufacturer for a rainy day, has begun to gradually accept and use R22 alternative r404a HFC refrigerants of green environmental protection, etc. Although there are similar R404A and R22 refrigeration performance, but in actual use, there are many differences must pay attention to both. In order to help you better use of HFC refrigerants of green environmental protection, is now in the piston compressor refrigeration system using R404A refrigerants need to pay attention to some of the problems are discussed briefly.

refrigerant R404a replace R22 concern

1, the use of alternative refrigerant R22 R404a biggest issue is oil, must be used PVE ester oil to replace R22 with mineral oil. Ester lubricant and high affinity for water and water is poor, it should be used in the try to avoid contact with outside air, container after opening, should use as soon as possible, after use shall be kept sealed; Away from the oxidant, strong alkali, strong acid, save in ventilated place; When using, should avoid contact with skin and eyes, avoid inhaling its steam and spray.

2, the exhaust pressure of refrigerant R404A is about 1 of R22. 2 times, mass flow rate is 1 of R22. About five times, exhaust velocity increases, the resistance increased. Condenser, in general, the change of heat capacity than R22 increased 20% ~ 30%.

3, the same temperature R404A and R22 saturation pressure is different, so the R404A institution and R22 different thermodynamic expansion valve movement. As refrigerant R404A and lubricating oil on sealing material intermiscibility, expansion valve sealing material also should accordingly change, therefore, on the choice of thermal expansion valve should choose R404A dedicated expansion valve.

4, due to the saturation pressure is higher than R22 R404A, so the system pressure container design pressure to make changes, to ensure safety. Such as accumulator and gas-liquid separator, etc. At the same time, system parts are installed on the relief valve and fusible plug value will change accordingly. Because in the same conditions of displacement, R404A gas density around 50% larger than that of R22, so when using R404A refrigerant piping design, selection of pipe diameter than the R22.

5, the same compressor, using R404A current than R22, so the compressor ac contactor, thermal relay, and cable wire diameter to adjust. In the aspect of system protection, high pressure switch Settings from 2. 45 mpa is adjusted for 2. 7MPa。

6, because of 404 a saturation pressure and R22 is different, so the air tightness test pressure than R22. System at the same time the vacuum degree 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 changes.

7, R404A are azeotropic mixed working medium, non azeotropic mixture composition concentration changes with the temperature, pressure, the production of refrigeration system, debugging and maintenance has brought certain difficulties, the heat transfer performance of the system is also can produce certain effect, especially when the refrigerant leakage, all system refrigerant needs emptying displacement, so as to guarantee the proportion of each blend components, and to achieve design refrigeration effect, otherwise it will get worse and worse. This article source: refrigeration encyclopedia.

because of refrigerant R404A and lubricating oil has nothing to do with the intermiscibility of water is very good, so the system of water and residue, and cleanliness requirements such as compared with R22 refrigerant are improved, R404A moisture control and impurities control system is an important indicator of the system in the corresponding filter unit, etc. To make changes.

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