Introduction of the Most Common Refrigerant Gases

Also known as freon refrigerant, the chemical name is difluorochloromethane, and the chemical formula is CHF2Cl. It is a medium-pressure medium-temperature refrigerant with a boiling point of -40.8 °C, a freezing point of -160 °C, a critical temperature of 96 °C, and a critical pressure of 4.974MPa. Although R22 does not burn, does not explode, and is less toxic, it has a strong permeability and is difficult to detect after a leak. The unit volume of R22 is similar to that of ammonia refrigerant. The lowest temperature that can be achieved by two-stage compression or in an air-conditioning refrigeration system is -80°C, but this method is not economical.

It is composed of R32 and R125 working fluids mixed with 50% and 50% mass fractions, and belongs to HFCs refrigerants. R410a refrigerant is non-flammable, with an ODP of 0 and a GWP of 2340, so R410a is not a truly environmentally friendly refrigerant. With a bubble point temperature of -51.6°C and a phase transition temperature slip of less than 0.2°C, R410a is a near-azeotropic mixture with thermodynamic properties very close to those of a simplex. The capacity and pressure of R410a refrigerant is higher than that of R22, and the operating pressure is 50%-60% higher. The operating noise of the R410a is significantly lower than that of the R22 compressor by 2-4 decibels. Due to its high pressure and high density, the refrigerant pipe diameter can be reduced a lot, and the compressor size and displacement can also be reduced; At the same time, the high thermal conductivity and low viscosity of the R410A liquid phase give it superior transport characteristics to R22.