Various Freon in walk-in cooler (2)
Various Freon in walk-in cooler
The chemical formula of refrigerant R22 in walk-in cooler is CHF2Cl, the standard boiling point of R22 is -40.8℃, and the freezing temperature is -160°C. R22 is non-flammable, non-explosive, colorless, odorless, and slightly more toxic than R12. The solubility of water in R22 liquid is slightly greater than that of R12, but ice plugging will also occur when the walk-in cooler is working. Therefore, the water content in R22 is also required to be no more than 0.0025% (mass fraction), and a dryer must be equipped in the system. R22 and lubricating oil are partially soluble, and its solubility also decreases with decreasing temperature. R22 has the same effect on metals as R12, but has stronger corrosion ability to organic substances than R12. The sealing material can be chlorohydrin rubber or CH-l-30 rubber. In the hermetic compressor, the motor can use QF modified acetal enameled wire (Class E insulation), QZY polyester imide enameled wire. R22 is a walk-in cooler medium temperature refrigerant, the temperature range is -80~0℃, the condensation pressure and volumetric cooling capacity of R22 at room temperature are similar to ammonia, and the final compression temperature is between R12 and R717. At moderate temperatures, the saturation pressure of R22 is 65% higher than that of R12, and the cooling capacity per unit volume is much larger than that of R12. R22 leaks more easily than R12, and its leak detection method is the same as R12. At present, R22 is increasingly used in small air-conditioning devices. R22 is used in the walk-in cooler two-stage compressor to reach a low temperature of -50~-60℃. Used as a high-temperature walk-in cooler refrigerant in a cascade compression low temperature box at -80℃. The chemical formula of refrigerant R134a in
walk-in cooler is C2H2F4, and its evaporation temperature under normal pressure is -26.2℃. It is non-toxic, non-flammable and non-explosive, and has similar thermal properties to R12. Its ODP is 0, GWP is 0.24~0.29, it has no destructive effect on the ozone layer, and the greenhouse effect is small. Compared with R12, R134a has a slightly lower evaporation pressure at the same evaporation temperature: while at the same condensation temperature, its condensation pressure is slightly higher than R120. The cooling capacity per unit volume of R134a is slightly lower than that of R12, and its theoretical cycle efficiency is also slightly lower than that of R12. Generally speaking, the cooling capacity and unit power consumption of the compressor using R134a will be reduced by 2%~5%. After the heat recovery cycle, this gap can be narrowed. The isentropic index of R134a is smaller than that of R12, so under the same evaporation temperature and condensation temperature, its exhaust temperature is lower. Compared with R12, the solubility of water in R134a is smaller. Therefore, in the refrigeration system using R134a, especially in low temperature systems, a filter dryer with better water absorption performance is required. The heat transfer performance of R134a is much higher than that of R12. The surface heat transfer coefficient of the condensation and evaporation process is generally 15% to 35% higher than that of R12, which will improve the efficiency and performance of the R134a system. R134a is incompatible with traditional mineral oil, so new lubricants must be used to adapt to R134a. There are currently two types of polyglycols and polyesters. The research work of replacing R12 with R134a is still under development. Among walk-in cooler refrigerants, R134a replacing R12 is a foregone conclusion. In other occasions such as refrigerators, walk-in coolers, transport refrigeration units, etc., R134a is still the most popular One of the hopeful alternative working fluids.
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