Properties of R12 and its Advantages
Here are some of the important properties of the refrigerant R12:
1) Safe properties: Refrigerant R12 is nontoxic, nonflammable, and non-explosive. This makes it highly popular for the domestic as well as the commercial applications.
2) Stability: R12 is highly stable chlorofluorocarbon and it does not disintegrate even under the extreme operating conditions. However, if it is brought in contact with the flame of fire or the electrical heating element, it disintegrates into the toxic products. Thus whenever there is leakage of R12 refrigerant it is advised to put all the flames off and keep the doors open so that it can escape to the open atmosphere.
3) Suitable for wide range of operating conditions: R12 has the boiling point of -21.6 degree F (-29.8 degree C) due to which it condenses at the moderate pressures at the atmospheric temperature. This means the discharge pressure of the compressor should be only moderate so as to produce the condensation of the refrigerant in the condenser at the atmospheric temperature. This helps in using the compressor of low compression ratio that has higher efficiency. Due to this property of refrigerant R12, it is used in wide range of applications like high-temperature, medium temperature and low-temperature applications. It can be used will all types of compressors like reciprocating, centrifugal and rotary.
4) Miscibility with oil: Refrigerant R12 is miscible with the compressor oil under all the operating conditions. There are two advantages of this property of R12. Firstly, there is no problem of the oil return back to compressor. Some particles of the oil from compressor tend to get carried away with the discharged refrigerant, because of the property of miscibility of R12, these particles return back to the compressor easily. The second advantage of miscibility is that the refrigerant flowing through the condenser and the evaporator is free of the oil particles. The oil particles within the refrigerant reduce the heat transfer from it, but such problem does not occur with R12 refrigerant. Due to this the heat transfer capacity of the condenser and evaporator is increased, which ultimately helps increase the efficiency of the refrigeration plant.