Refrigerants can be defined as the heat transfer medium that absorb heat at low temperature and pressure, by means of evaporation and give up heat by means of condensation at high temperature and pressure. Suitable and good refrigerants can be defined as those having properties such as good stability, non-toxicity, non-flammability, and having atmospheric boiling point in between the range of – 40 degree Celsius to 0 degree Celsius.